Spot Network Equipment 18.0-1 May 2017 Sheet 18001

Contents i Spot Network Equipment Discussion ii Spot Network Decision Tree...... 18.0-2 General Description ...... 18.0-3 1 Commercial Spot Network Design Considerations ...... 18.0-5 Network Protector Equipment 2 Liquid-Type Network Transformers ...... 18.0-16 Dry-Type Network Transformers ...... 18.0-18 CM52 Network Protectors ...... 18.0-20 3 Protector NPL Fuses ...... 18.0-24 MPCV Network Relay ...... 18.0-25 4 Communications Capabilities ...... 18.0-27 MPCV Network Relay Communications ...... 18.0-28 5 Communications Configurations...... 18.0-30 CM52 Protector Schematic ...... 18.0-31 Network Disconnect Cabinet ...... 18.0-32 6 Network Transition Box to Busway ...... 18.0-33 Rating Selection 7 Spot Network Equipment Selector Guide...... 18.0-34 Protector Application Information ...... 18.0-36 8 Layout Dimensions Liquid-Type Network Unit Dimensions ...... 18.0-37 9 Dry-Type Network Unit Dimensions ...... 18.0-38 Dry-Type Network Unit— Switchgear Mounted Protector Dimensions ...... 18.0-39 10 Specifications Equipment See Eaton’s Product Specification Guide, available on CD or on the Web. 11 CSI Format: ...... 1995 2010 Section 16422 Section 26 23 16 12

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CM52 Network Protector 21

CA08104001E For more information, visit: www.eaton.com/consultants 18.0-2 Spot Network Equipment Discussion May 2017 Sheet 18 002 Spot Network Decision Tree

i Continuity of Considering Spot Networks for Continuity of ii Service Critical Electrical Distribution in a Facility? Service NOT Critical

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2 Does the local utility offer multiple circuits for Use Radial design at one the metered utility service? or more service voltages. 3 YES NO

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5 Are the multiple incoming Use separate Radial circuits from the utility or Double-ended in synchronization? Substations with Open 6 YES NO Transition Switching.

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8 Are the multiple circuits from the utility Spot Networks may be the same voltage and frequency under possible, but without the most operating conditions? redundancy of multiple 9 YES NO primary circuits. 10

11 How many circuits are available or routed to each major load areas of the facility? One (1) Two (2) Three (3) Four (4) 12

13 Spot Networks may be Three Transformer Spot possible, but without the Networks are practical. 14 redundancy of multiple See Pages 18.0-34 through primary circuits. 18.0-36 for Application information. If anticipated 15 load = Y kVA, use three network transformers 16 each rated Y/2 kVA.

17 Two Transformer Spot Four Transformer Spot 18 Networks are practical. Networks are practical. See Pages 18.0-34 through See Pages 18.0-34 through 18.0-36 for Application 18.0-36 for Application 19 information. If anticipated information. If anticipated load = X kVA, use two load = Z kVA, use four network transformers network transformers 20 each rated X kVA. each rated Z/3 kVA.

21 Figure 18.0-1. Spot Network Decision Tree

For more information, visit: www.eaton.com/consultants CA08104001E Spot Network Equipment 18.0-3 May 2017 Discussion Sheet 18003 General Description

Description i Eaton’s Spot Network Systems are Typical Feeder designed to ensure service continuity Primary Circuit in 208/120 V and 480/277 V wye con- To Other ii Networks nected secondary network systems. Network Transformer These systems, in either grid or spot network form, are commonly used in Protector 1 areas of high load density such as Fuses metropolitan and suburban business Optional Main, 50/51 districts or facilities. Relaying and/or 2 Network Disconnect Tie Tie Low Voltage Suburban loads were formerly almost Switchgear Drawout entirely residential and power outages LV Feeder NC NC 3 caused little more than personal inconvenience. Now, the suburban load includes not only shopping Customer Customer Customer Loads Loads Loads 4 plazas, industries and residences, but such vital facilities as hospitals and airports. For these and other critical Figure 18.0-2. Typical Configuration for Three-Transformer Spot Network 5 loads, power interruptions can have to a radial system supplying the same serious consequences to public and Better Continuity of Service loads, because of the diversity in the personal safety. Spot networks The largest user of network systems demand among the larger number of 6 provide superior reliability at these in the United States is Consolidated circuits. Therefore, less transformer important loads. Edison of New York. Historical data capacity may be required in a network developed by this utility illustrates that 7 The need to supply increasing amounts system than in a radial system in the outages are very rare (approximately same area, particularly if three or of power efficiently, without increasing zero) on grid systems and that spot equipment size, has resulted in a shift more primary feeders supply the network systems are five times more network system. 8 from 208 V to 480 V wye systems. The reliable than secondary selective change to a higher utilization voltage double-ended substation services. requires a commensurate change in System Operation 9 operating procedures because of the Improved Regulation— A short circuit on any one primary difference in arcing characteristics at Less Voltage Sagging feeder will cause all the network protec- 480 V compared to 208 V. For example, tors on that feeder to open on reverse 10 while an arc in a 208 volt system is Each load is supplied from at least two energy, provided the total power on normally self-extinguishing, an arc directions. Services supplied from a the three-phase feeder is in the reverse in a 480 V system will usually burn transformer location have a minimum direction. When the feeder cable is 11 until it is interrupted by an overcurrent of two paths of supply on utility repaired properly, the network protec- device or until it totally consumes the grids and spot networks, and can tors on that feeder will automatically arcing material. be designed to have more. Abrupt reclose when the feeder circuit breaker 12 Secondary network systems using changes in loads, such as motor at the upstream switchgear is closed, if Eaton Network Protectors are among starting, cause much less voltage correct voltage conditions exist at the the most dependable in use today. disturbance due to the multiple paths network transformer. 13 for load current compared to simple In the event of a fault on a primary If the phases are reversed during the system cable or transformer, the radial services. The voltage dip resulting from a given starting cable repairs, the protectors will not 14 protector opens due to reverse power reclose automatically as long as the flow, thus isolating the fault from the current may be 70% less in a network system than in a radial system. network remains energized. Likewise, network bus and avoiding load power if a voltage less than network voltage 15 disturbances. Loss of the primary Less Transformer is restored to the feeder, the network feeder will not result in service protector on that feeder will not outage at the load on the secondary Capacity Required reclose automatically. The unit could 16 network. The other primary feeders In normal operation, the loads along be closed manually if the network will continue carrying the load until the the network service are divided among relay trip contact is not closed. faulted cable is repaired and returned the various network transformers in If a feeder from a networkable source 17 to service. such a way that the best possible is to be connected to an energized voltage conditions and lowest losses The network protector basically network, the incoming voltage must be are realized. Because all the services consists of a special air power breaker, slightly higher than the network voltage 18 are tied together, many more loads are a breaker operating mechanism, net- and in proper phase relation with it. If supplied from the same secondary work relay(s) and control equipment. a feeder is being connected to a dead network source than in a simple Units are available in both weather- network, it is sufficient to have the 19 radial system. The peak loads on proof and submersible enclosures for incoming voltage high enough to the transformers are correspondingly either separate or transformer throat operate the closing mechanism. mounting. Switchgear mounting is lower in the network system compared 20 also possible. 21

CA08104001E For more information, visit: www.eaton.com/consultants 18.0-4 Spot Network Equipment Discussion May 2017 Sheet 18 004 General Description

Maintenance of primary feeder circuits i can be accomplished by opening upstream switchgear primary devices Primary Feeder one at a time, thereby opening every Breaker ii protector connected to a given primary due to reverse magnetizing currents flowing through each protector served. 1 By opening the primary circuits one Typical at a time, the network loads are not Protector Typical Network Transformer disturbed. Also, at times of light load, 2 the system can be economically LOADS loaded by disconnecting some of the LOADS LOADS primary circuits and operating the 3 transformers at more efficient levels. Although the protectors are capable of opening under reverse magnetizing Grid 4 Grid currents, the opening may be delayed LOADS LOADS LOADS depending upon the time delay setting 5 of the network relay. When the load increases on the net- work, other primaries can be brought 6 into service by closing the feeder LOADS LOADS LOADS breakers. The associated protectors on the reactivated feeders will reclose Figure 18.0-3. Typical Configuration for Utility Grid Network 7 serving the network if the transformer voltage is higher than the network CM52 Protector Advantages Spring Close Operating Mechanism: voltage by a certain minimum amount Avoids partial closures. The CM52 8 and in the proper phase relation. spring close mechanisms will not The network protector fuses provide permit closing motion of the contacts 9 backup protection for clearing faults until the closing springs are fully on the primary feeder in the unlikely charged. Also provides close and event the protector fails to operate. latch ratings on protectors. 10 These melting alloy or partial range Externally Mounted Silver-Sand Fuses: current limiting fuses are located on Operate with no contamination of the the load-side of the protector, and protector, and will positively interrupt 11 when removed, serve to isolate the fault current to disconnect the protec- protector from the network. tor from the network bus in abnormal Numerous protector models are avail- fault situations. 12 able from Eaton and the best product Low Energy, Trip Actuator: Provides for the application is a function of the reliable tripping effort, even when type of system being designed: utility system voltage is not available, up to 13 CM52 Protector grid (see Figure 18.0-3) or spot four operations via remote tripping network. Spot network systems Exclusive Drawout Design: With before recharging is needed. (see Figure 18.0-2) usually use the positive safety interlocks, provides 14 Close and Latch Ratings: Ratings CM52 type of protector, which has maximum protection against contact comparable to air power breakers important safety features not found on with energized components while are readily available because the earlier Eaton or competitor models. disconnecting the unit for test or main- 15 mechanism is spring charged, unlike tenance; ensures maximum safety for motor operated protectors which have operating personnel. All main current no close and latch ratings. 16 carrying and mechanical operating components are located behind a Increased Dielectric Strength: CM52 deadfront panel which minimizes the units have passed a more stringent 17 possibility of tools or hands being dielectric test voltage of 5000 Vac inserted into an energized protector. compared to the lower value of 2200 V The drawout unit is operated by a required by ANSI standards. 18 hand-cranked levering system, which cannot be engaged unless the circuit Stored Energy Option: The CM52 can breaker is open and cannot be disen- be provided wired for stored energy. 19 gaged unless the drawout unit is either This option charges the closing springs fully disconnected or fully connected. after a closure, resulting in a 5-cycle close after a trip event. This is the 20 Modular Construction: Simplifies field preferred configuration for 2-unit maintenance and/or replacement of spot networks. components. Protectors can be quickly put back into service reducing 21 maintenance time.

For more information, visit: www.eaton.com/consultants CA08104001E Spot Network Equipment 18.0-5 May 2017 Discussion Sheet 18005 Commercial Spot Network Design Considerations

Commercial Spot Network Design Considerations Coil #1 Interlock i This section deals with the various Interlock logic can vary components that make up the thus both an A and B ii commercial spot network, either as a auxiliary contact is Primary Mag- Network supplied. double-ended substation or multiple Break Switch Transformer transformer substation. The intent of Open ab 1 the discussion is to give some basic guidelines for the selection of Eaton Closed transformers and network protectors. To Network 2 The major issues and components that Protector Fuses will be discussed are: Ground Position 3 1. Primary switches 2. Network transformer types 4 3. Network protectors 4. Spot network disconnects Coil #2 Interlock 5 5. Low-voltage drawout switchgear Figure 18.0-4. Three-Position Primary Switch Interlock for Liquid Network Transformers configurations These liquid switch designs use transformer protection. See 6 6. Typical spot network layouts electrical interlocks that prevent the Figure 18.0-13 later in this section unintentional movement of the switch, for a specific example of this type of 7. Use of current limiting fuses with either the network protector in situation. When dry-type units are 7 8. Network device coordination the “Closed” position or the medium- used, one solution is to add power voltage feeder being energized. fuses to the load-break switches. 1. Medium-Voltage Primary Switches Figure 18.0-4 shows the typical However, this option is not easy when 8 electrical connections for the interlock- liquid types are used unless air The incoming medium-voltage feeder ing between the primary switch, switches are added ahead of the may range from 4160 V to 34.5 kV. Any transformer and network protector. integral type liquid switches. Eaton 9 feeder which has a voltage higher than recommends that no more than two 34.5 kV should not be considered for Coil #1 and #2 are electrical interlocks transformers be served by a single spot network service because the cable which prevent unsafe operation of upstream breaker and relay, unless 10 charging capacitance begins to affect the primary mag-break switch. Coil #1 separate fused air switches are located the operation of the network relay ensures that the protector must be ahead of the transformers. response. The primary feeder enters used to break load current before 11 into a switch compartment, which can operating the switch from closed to If fuses are used anywhere in the primary be liquid or air type. The liquid type open. Coil #2 ensures that the primary circuit, the network protector relays transformers usually use a special cable must be deenergized before must be capable of tripping under 12 three-position, liquid-filled, non- operating the switch from closed WATT-VAR conditions. New digital load-break primary switch, which has to ground. These interlocks are not type network relays have the ability to a special third position for grounding necessary on a two-position air configure their tripping characteristics 13 the incoming feeder cable during switch if it has load-break ratings. from WATT to WATT-VAR in the field. maintenance work on a primary circuit. Older type protectors having electro- Dry-type transformers may use a two- Due to their common use, liquid type mechanical relays should be updated 14 position air switch, which omits the network transformers are manufactured by retrofitting with the newer relays. third position. Grounding the circuit with the three-position mag-break only If fuses are not present, the standard becomes a manual procedure, if switch integral to the transformer. Dry- WATT trip characteristic, which is 15 needed, on dry-type transformers. type transformers use the commonly standard in the industry, is appropriate. Alternatively, dry transformers may available two-position air switch with use two load-break switches in a special flicker blades which give the air Each type of primary switch uses 16 narrow design configuration to switch a load-break rating. The capabil- unique terminations of the primary Close, Open and Ground positions ity of interrupting load currents can cable. Liquid switches use a terminal for the primary circuit. save time by not having to deenergize chamber which is filled in the field the feeder. The choice of switch type is with a suitable compound to improve 17 The three positions of the liquid thus dictated by the type of transformer the insulation strength of the cables. type non-load-break switch on liquid selected for the spot network system. Air switches use mechanical or 18 network transformers are: compression terminations with Another consideration is the necessity stress cones. 1. Close to provide primary overcurrent protection for each transformer, such Air switches require more floor space 19 2. Open as in the form of power fuses. Upstream than the integral liquid type of switch, 3. Ground breakers usually serve two, three or especially because the depth of the air four transformers on their circuit and switch is made to match the depth of 20 thus have the protective relays set at the transformer. Transition sections higher levels dictated by the entire add to required floor space if hard bus circuit load, which sacrifices individual connections, not cable, are required. 21

CA08104001E For more information, visit: www.eaton.com/consultants 18.0-6 Spot Network Equipment Discussion May 2017 Sheet 18 006 Commercial Spot Network Design Considerations

Whereas the three-position liquid Transformer impedances should fall The basic design constraint is that the i switch dimensions are no greater within the standard ranges indicated load not exceed the maximum thermal than 20.00 inches (508.0 mm) deep in Ta b l e 18 . 0 - 1 , or else the usual rating of the remaining unit(s) during off the end of the transformer and protector interrupting ratings may the time of the single contingency. ii 30.00 inches (762.0 mm) in width become inadequate. If impedances Protector ratings recommended by centered at the end of the unit. drop below these values, the maximum vendors, as well as protector circuitry, through-fault may exceed the interrupt- anticipate the loads and are sized to 1 It is possible to use both types of ing rating of the protector. Also, the handle the higher currents, so the switches for liquid installations. Groups impedance values among transform- limiting factor is the transformer. of air switches can be mounted along a ers in a spot network should be as close 2 wall to receive and distribute primary in value to each other that manufactur- One advantage of liquid designs is their circuit power to each transformer. ing tolerances will allow; this helps large thermal mass which enables them Individual power fuses can be reduce circulating currents between to handle higher currents for a longer 3 mounted within the air switches. transformers. If necessary to control period of time without the need for an Dry-well mounting of current limiting the fault currents at the secondary, the FA fan rating when compared to con- fuses in air canisters accessible from impedance values may be increased up ventional dry-type designs. When both 4 the top or side walls of the transformer to 8% or 9%. Contact Eaton for details. transformers are available, the 1000 kVA is not recommended. The available units in our example will only be loaded space will dictate much of the design Table 18.0-1. Transformer Impedance to 75% of their AA base rating. 5 if sufficient space is not allocated for kVA Size Recommended Z electrical system equipment. The transformer winding configuration 300–1000 5% or greater will depend upon the primary service Primary switches accommodate the 1500–3000 7% or greater available and the type of service 6 three-phase conductors and never use a needed by utilization equipment neutral conductor. Most spot networks Notice that 3000 kVA is typically the comprising the loads. For the most use delta wound transformers, so there largest transformer that can be used part, transformers are DELTA-WYE, 7 is no need to deliver the neutral through for network services, although Eaton which permits the lowest ground the primary switch. Any type cable can can go higher. relay pickup value for the primary 8 be used, however the more modern feeder breaker. This type of winding types are easier to handle than paper As an example, let’s assume a two-unit configuration also eliminates any zero lead insulated types which require spot network using dry-type transform- sequence current in the primary feeder 9 potheads for terminations within the ers having 80 °C temperature ratings. for load unbalances in the secondary. primary switch. In this example we calculate that the At higher primary voltages, 27 kV building load will not exceed 1495 kVA. through 34.5 kV, some use has 2. Network Transformer Because we are designing the service been made of GROUNDED WYE- 10 as a double-ended network substation, Characteristics GROUNDED WYE windings. The either transformer must be capable of advantage gained is the reduction of After the primary switch, the power is carrying the full building load of 1800 A. overvoltages which can result if one 11 delivered to the primary windings of a One choice is to select a 1500 kVA leg of the unit is de-energized. The network type transformer. The design transformer size which has a full load disadvantage is that the primary may be liquid- or dry-type, with liquid rating of 1805 amperes. However, in breaker ground relay must be set 12 types being more popular from a specifying transformers for network much higher because load unbalances historical perspective, due to their services, the units can be undersized, and ground faults in the secondary application in utility systems. realizing that under most conditions are reflected into zero sequence 13 However, dry-type designs are now both units are available to supply currents in the primary circuit. See available meeting the ANSI network power to the network. When only one Pages 18.0-16 and 18.0-18 for network standards. Most applications within is handling the entire load, it should be transformer features. 14 commercial buildings desire dry-type considered an abnormal event that designs due to the desire to avoid the should not continue indefinitely. 3. Network Protector fire hazard associated with liquid 15 The network protector can be provided dielectrics. It is important to use For our load of 1495 kVA, a 1000 kVA in an indoor enclosure, submersible proper dry-type ratings which mimic transformer will supply 1888 amperes or suitable for mounting within a low- the overload characteristics of liquid at 157% of nameplate rating, therefore 16 voltage switchgear assembly. Both the units, therefore dry types should be we would select a 80 °C rise 1000 kVA transformer side (line) and network rated for 80 °C rise and use Class H– dry-type unit operated at 115 ºC with (load) connections of the protector 20 ºC total temperature insulation fans (157% overload capability) and 17 are bus bar, which can accommodate materials in VPI designs or 185 °C in a protector with a continuous rating transformer flange connections and cast coil designs. Fans are normally of 1875 A. 18 employed to aid the air cooling during load-side connections to cable, bus- periods of overloading, and which In all spot network designs, the way or switchgear buswork. equipment must be sized to handle occur during a single primary outage. Network protectors are special self- the load even though one primary, contained air power breaker units 19 Secondary voltages are always 480 V and thus one transformer, is out of having a full complement of current, wye or 208 V wye. Also, 216 V wye service (known as a single contingency potential and control transformers, is a common rating. Primaries are condition) for some period of time. 20 always delta, such as 4160 V, 13.2 kV, as well as relay functions to protect 13.8 kV, etc. the integrity of the low-voltage network bus. 21

For more information, visit: www.eaton.com/consultants CA08104001E Spot Network Equipment 18.0-7 May 2017 Discussion Sheet 18007 Commercial Spot Network Design Considerations

Normally, protectors do not have any 4. Spot Network Disconnects Main Breakers overcurrent protection in the forward Main air power breakers are the safest i direction; if necessary, the 50/51 The multiple sources of power to the network bus can create a safety con- option to use as a network disconnect, function can be achieved through the and their interrupting rating guarantees use of remote mounted protective cern on the load-side of each protector. ii Obviously, each protector load-side is proper operation under all conditions devices and properly placed current including fault currents. Switchgear transformers. energized from the network so long as at least one transformer remains mounting of the main breakers means 1 Figure 18.0-5 illustrates a simplified connected. The use of a network that the disconnect device is the same diagram of the various components disconnect can provide a degree of type of device as all other overcurrent of the network protector. operator safety by requiring that the devices mounted in the assembly, 2 disconnect be used to disconnect the thereby requiring common mainte- Note: The symbol for a protector is the air protector load-side from the network nance and operation procedures. The breaker symbol with a dot in the middle. before allowing access to network mains can be key interlocked with their respective protectors to ensure that the 3 Protectors have either rollout or fuses or protector mechanism. Such a disconnect reduces the likelihood of protectors are opened first, then the drawout mechanisms for easy mainte- mains are opened and racked to a dis- nance. Protectors having the drawout contacting live bus and forces opera- 4 tors to follow a safe procedure prior to connect position prior to maintenance mechanisms, such as the CM52 type, of the protector or circuit devices. are comparable to air power breakers any protector maintenance. Accidents in terms of maintenance and stored involving protectors can be traced Main breakers include overcurrent trip 5 energy functions. The older rollout to the absence of such devices in units to provide individual overload units use manually disconnected fuses customer’s facilities and distribution protection for each protector and and links which must be removed from system designs. Eaton encourages conductors. This protection is not a 6 the energized network bus prior to the use of network disconnect devices, normal function of the network relays rolling the unit out of the cubicle for especially in facilities not having and augments protection generally inspection, testing and maintenance. dedicated maintenance staff. Many so long as the trip unit settings are 7 Details on protectors are reviewed later forms of disconnect devices are properly coordinated with the tie and in this section and the recommended available; the specific choice depends feeder devices. The trip unit protection spot network equipment ratings for upon several related factors such as does not protect the incoming cable 8 two, three and four unit configurations protector mounting, use of main against fault currents such as ground are shown in Tables 18.0-9 through breakers, protector type, etc. Three faults or short circuit currents; the 18.0-12 that appear on Pages 18.0-34 key choices for network disconnect sensors are not located at the lineside 9 and 18.0-35 in this product section. devices are outlined below. of the protector circuit, rather they Types of Network Disconnects are at the switchgear (load) side thus The protector load-side contains a giving only overload protection. 10 network fuse, usually a partial range Principally, the two types are main current limiting type. The fuses are air power circuit breakers within The key interlocking between main air present as back-up protection. These switchgear assemblies and non-load- power breakers and network protectors 11 fuses are separately removable, but break hookstick operated switches is optional because the main is a true do not drawout with the protector mounted above the protectors in a interrupting device usually rated at or mechanism. Commonly, the fuses are NEMA 1 cabinet. above 65,000 A interrupting at 480 V. 12 located at the top of each protector. When mains are used as load-break Regardless of the type used, each devices on network services, the open- The fact that the fuses are located on disconnect is interlocked with the ing of a main may result in the opening 13 the network side means that fuse protector to ensure that the load-break of the respective protector, however maintenance requires operators to protector is used to break and make maintenance procedures should always come into contact with live parts and the load currents. The protector verify protector operation. 14 conductors which can deliver high mechanism is rated for at least 10,000 fault currents. A method of easily operations before maintenance and Non-Load-Break Disconnect disconnecting the secondary of the is the best device to interrupt normal The network disconnect device for 15 protector from the network bus, load currents. Protectors include an mounting above the protector is the similar to the configuration of the operations counter to keep track of the non-load-break bolted pressure switch. primary, is needed to isolate the number of operations. The interlocks The device is hookstick operated from 16 fuse and protector, thus the need may be keyed type or electrical control the floor and provides a reliable means for a network disconnect. wiring. Refer to Figure 18.0-6 for a of visibly disconnecting the protector typical one-line. circuit from the load-side of the protec- 17 tor. The switch is NEMA 1 cabinet mounted with double doors and electrical interlocks to assure that the 18 protector is used to break the load current. The door interlocks have a defeatable procedure if qualified 19 personnel need to gain access under load flow conditions. Key interlocking with the protector is not necessary. 20

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CA08104001E For more information, visit: www.eaton.com/consultants 18.0-8 Spot Network Equipment Discussion May 2017 Sheet 18 008 Commercial Spot Network Design Considerations

Network transformer neutrals are i Protector Fuses brought to the load-side area of the Potential Transformer (PTs) disconnect for transitioning to the protector circuit neutral for delivery into the switchgear. The load-side of ii MPCV Voltage the disconnect can accommodate Load-Side outgoing busway or cables as needed. (Network) 1 MPCV Phasing See Page 18.0-32 for network Voltage disconnect features. Network 2 Protector PTs 50/51 Relaying for Protectors MPCV = Protector Users who specify the non-load-break Network MPCV Trip Relay disconnect can easily add the current 3 transformers for relaying at the load- Ground side of the protector circuits and Line-Side (Transformer) provide superior fault and overload 480 V 125 V MPCV Close protection for the incoming conduc- 4 Motor b MPCV tors between the protector and the 208 V switchgear buswork. The relays are Trip 5 Transformer Control Txs. a usually mounted within the switchgear Trip and use a lockout feature to trip and lockout the protector. Modern 6 Figure 18.0-5. Typical Network Protector Schematic microprocessor relays such as the Eaton Digitrip® 3000 can also be used for the 50/51 protection to save costs 7 and mounting space. Network Transformer The use of forward relaying on the 8 5 kV or 15 kV protector circuit needs to be coordi- Primary nated with the tie breakers to ensure 208 or 480 Wye that the protector auxiliary 50/51 Secondary Network 9 Protector protective settings are not faster than the tie settings. Coordination is achieved when the ties are faster 10 acting than the 50/51 protector forward Fuses overcurrent relays, and they usually trip open first due to the presence of 3 Cts 11 multiple transformer faults passing Disconnect ᕃ Switch (Optional) through the ties. See Figures 18.0-14 and 18.0-15 for more details. Also refer 12 to tables on Pages 18.0-34 and 18.0-35 for details on the recommended tie 86 50/51 Main Breaker device ratings and settings. LV SWGR 13 The use of forward relaying current Cont. NC Tie Cont. transformers is recommended even 14 when the non-load-break disconnect Figure 18.0-6. Partial Spot Network One-Line Diagram—One of Two, Three or Four Circuits is not used, such as occurs when only 1 Recommended when no separate main breaker is used. transition boxes are used at the top of the protectors. 15 This product has become a standard The non-load-break design has been for Eaton and is manufactured in chosen over the load-break for several System Neutral Grounding the same plant as the protector for reasons. First, the load-break mecha- Regardless of the device selected as 16 improved assembly and product nisms need regular maintenance and the network disconnect, the XO trans- coordination. Recent designs move should not be allowed to sit in a closed former neutrals are not grounded at the the NPL fuses on the protector into the position for years, then be called upon transformers. Rather they are brought 17 disconnect cabinet to ensure that fuses to operate without failure. This type of into the switchgear and grounded at have controlled access. Space exists duty is exactly what is required of a one and only one location. This config- 18 within the cabinet to mount separate network disconnect. Additionally, the uration allows the use of the ground current transformers to provide inputs operating mechanism of a load-break return method of ground fault protection for separate instantaneous and time design requires a lot of force, more whose zone of protection extends from 19 delay overcurrent relays which protect than an operator can safely deliver the secondary transformer windings to the protector circuitry from point of from a ladder or step. Hookstick the outgoing air power breakers in the supply to the switchgear buswork. The operation from the floor is a safer switchgear. Other ground fault detection 20 General Services Administration uses procedure. Refer to Figure 18.0-7 for methods are possible, but are consider- this type of product on hundreds of typical section view of network units ably more complicated to wire and network units throughout the National using a network disconnect atop maintain and are without significant 21 Capital Region and in other areas of the the protector. advantage or greater reliability. country where networks are used.

For more information, visit: www.eaton.com/consultants CA08104001E Spot Network Equipment 18.0-9 May 2017 Discussion Sheet 18009 Commercial Spot Network Design Considerations

5. Low-Voltage Drawout i Switchgear Configurations Neutral Bus Load Transition The most reliable and safe network bus Neutral equipment is in the form of low-voltage (XO Bushing ii on Back) Non-load-break drawout switchgear built per ANSI C37 Primary Disconnect standards. Unlike the UL® 891 Switch NEMA 1 Cabinet switchboard assemblies, low-voltage 1 Fuse Location switchgear uses true 200,000 A braced (Inside) buswork, 30 cycle short time ratings, drawout stored energy air power circuit Network Protector 2 breakers rated for 100% application, (CM52 Type) for easier maintenance—all of which Network provides superior performance Transformer 3 compared to fixed mounted molded case breakers in switchboard construction. This is true regardless 4 of where the protector is mounted. Section View A typical switchgear installation of a protector uses a low-voltage switchgear 5 compartment which is 96.00 inches (2438.4 mm) high x 44.00 inches Figure 18.0-7. Typical Non-Load-Break Network Disconnect Mounting Arrangement (1117.6 mm) wide x 66.00–84.00 inches 6 (1676.4–2133.6 mm) deep. because the GFR-T should not attempt ground buses can reduce the usage of to trip the Tie open. Therefore, power four breaker cells in the switchgear to Refer to through Figures 18.0-8 18.0-12 will be maintained on the low-voltage three. Vendor designs vary on this issue. 7 which illustrate typical plan views bus with the Tie breaker remaining All four breaker cells are available on and front elevations for double-ended closed. See Figures 18.0-9 and 18.0-11 two-unit, three-unit, and four-unit network substations and three trans- for layout arrangements for dry-type systems from Eaton, when Magnum 8 former spot network designs. Figure and liquid-type spot networks DS switchgear is used. 18.0-8 shows the bus configuration of respectively. the two-unit spot network substation. The ampacity of the phase and neutral 9 Note that there must be a separate Figure 18.0-10 shows the bus configu- buswork must meet the gross demand ground return neutral bus which has ration for a three-unit commercial spot plus spare capacity for growth as only one point of connection to the network. Again, the ground return neu- stipulated by the National Electrical 10 grounding conductor. This type tral bus is required which has only one CodeT for the loads served. If each arrangement permits selective tripping point of connection to the grounding transformer on a two-unit spot of the Tie, then the protector. For a conductor. Selective tripping is network has been sized with 100% 11 line-to-ground fault on Bus #1, the achieved in the same fashion as the redundancy, then each protector 86T lockout relay controlling the Tie double-ended network substation with and load buswork should be rated to breaker will be operated first when GFR-T sensing ground current and carry the entire load from one primary 12 GFR-T detects 1.0 per unit ground operating the 86T device which then feeder and one transformer. Three- current. After the Tie breaker is open, opens both Tie breakers. The ground unit spot networks can reduce the the line-to-ground fault current is relays GFR-1, GFR-2 and GFR-3 will redundancy to 50% for the same 13 sensed only by GFR-1, which will only sense ground current after the loads because two units remain in actuate the 86-1 lockout to trip the Tie 86 lockout is energized and the service. Four-unit spot networks network protector NP #1. tie breakers are open. Interlocking aux- may reduce the redundancy to 33%, 14 iliary contacts on the 86-T with the unless the loads need to be served For primary faults, the network relay GFR circuits guarantees this selective from two remaining services in which must be set such that it can respond tripping and ensures the user that case 100% redundancy is still required. 15 to both reverse magnetizing levels ground currents are accurately of current as well as to any primary measured. The ampacity of the ground 6. Typical Spot Network Layouts circuit fault current. Because most return neutral bus must meet the 16 systems employ DELTA-WYE wind- The amount of space available for the minimum requirements of the neutral electric service will dictate the size and ings, primary faults will not be bus. It is prudent to size the ground detected by either GFR-T or the GFR quantity of the network units chosen return neutral bus the same size as for a project. Double-ended substations, 17 devices associated with the protectors, the phase bus, because the ground because no zero sequence current will especially dry-type designs, tend to be and neutral carry fault currents during arranged in a single lineup with the flow. However, if GROUNDED WYE- abnormal events. 18 GROUNDED WYE transformers are primary feeders located at opposite used, the relay coordination must be The space required by the ground ends of the room. Refer to Figure 18.0-9 such that the network relay responds sensors and connecting buswork can for an example of this type of arrange- 19 first to primary feeder faults. This be accommodated easily in two-unit ment. The single lineup can be used if permits the correct operation of the spot networks. However, on three- space permits. One alternative is to protector under such conditions, and four-unit systems, the extensive locate the transformers behind, or in 20 structure-to-structure insulated ground front of the switchgear, with intercon- bus plus the normal phase, neutral and necting busway or cables. 21

CA08104001E For more information, visit: www.eaton.com/consultants 18.0-10 Spot Network Equipment Discussion May 2017 Sheet 18 010 Commercial Spot Network Design Considerations

(228.6–254.0 mm) required by a rail i mounted top of gear breaker lifter device, or the network disconnect, and must be accommodated. Liquid ii transformer units have very high core and coil untanking heights, which precludes any chance of untanking the 1 core and coils in a normal building. See Figures 18.0-33 through 18.0-35. N.P. #1 N.P. #2 2 Regarding conductors, it is prudent to 1 1 remember that busway can enter or 86-1 86-2 exit a switchgear structure at only 3 one location. Room does not exist to accommodate more than the first run of busway in a single section, unless 4 50/51 50/51 the first connects at the top and the second connects at the bottom. NC PH. A,B,C PH. A,B,C A typical plan view for a three-unit spot Tie 5 network is shown in Figure 18.0-11; N N four-unit spot networks are similarly 86-T designed. If it becomes necessary to 6 split the switchgear assembly, position Feeder GFR-1 GFR-2 Feeder Breakers Breakers the splits at one side or the other of the GRN Tie devices. This approach simplifies 7 (Ground the power connections of the neutral Return GFR-T Neutral) and ground buses. 8 The number of network transformers Loads Loads used in a typical spot network is Ground Bus directly correlated with the number of 9 independent, yet networkable primary feeders available. At least, that is a Figure 18.0-8. One-Line for Two-Unit Spot Network—Protectors as Mains 1 general rule to follow, however the 10 Protectors not fused. secondary equipment can take many configurations.

11 FDR FDR FDR FDR Eaton recommends using at least one normally closed tie breaker in the low- voltage metal-enclosed switchgear for FDR FDR FDR FDR the purpose of isolating ground faults, 12 2-Position Tie 2-Position PRI SW. Transformer Network Network Transformer PRI SW. and for maintenance of the assembly (Fuse) Protector Protector (Fuse) FDR FDR FDR FDR (cleaning, torquing and testing). 13 Usually the number of normally closed FDR FDR FDR FDR Tie breakers equals N-1, where N equals the number of transformers 14 used in the spot network. However, for Figure 18.0-9. Front View of Double-Ended Network Substation Protectors as Mains some projects it may be desirable to Three or more transformer unit spot Equipment weights should also be have a “ring” low-voltage assembly 15 networks cannot be arranged in one investigated to ensure that the structure where the number of Tie breakers lineup, therefore they use the remote can support the network assemblies. equals N. In such a “ring” spot mounting of the transformers. Refer to Means of egress and routes to remove network, a Tie busway or cable 16 Figure 18.0-11 for an example of this material if replacement becomes connects the extreme left side bus type of equipment layout. It is important necessary should be identified. Avoid of the assembly to the extreme right to remember which side or end of placing any network equipment against side bus, thus keeping the N-1 network 17 equipment is used for normal operations any wall; the NEC clearances required configuration even when one primary when designing a network layout. The probably double if two means of egress or network transformer is down, or the primary switches are operated from are not available. Structural columns low-voltage assembly bus is down for 18 the end as are the protectors. Switch- pose challenges, however they rarely maintenance or fault isolation. gear needs both NEC clearances at the defeat network arrangements; avoid Main breakers, when used, may be 19 front and the rear, due to the drawout switchgear door openings bumping positioned in switchgear that is one breakers and the rear accessible cable against columns before they are integral lineup, or mounted in switch- compartments. Designers are encour- fully opened. gear close-coupled to dry-type trans- aged to pay attention to the different former/protector pairs which feed 20 voltage levels present, both medium- The highest piece of equipment may be the low-voltage switchgear, which power circuits to remote assemblies and low-voltage, and the required having all Tie and Feeder breakers. working clearances given in the NEC is usually 96.00 inches (2438.4 mm) 21 or local codes. in height, plus the 9.00–10.00 inches

For more information, visit: www.eaton.com/consultants CA08104001E Spot Network Equipment 18.0-11 May 2017 Discussion Sheet 18011 Commercial Spot Network Design Considerations

Historically, some users and designers have recommended using low-voltage i busway as the spot collector bus, then feeding loads radially from the collector bus. Eaton does not recom- ii mend low-voltage busway as the network collector bus, because it has N.P. #1 N.P. #2 N.P. #3 limited short-time ratings and has 1 higher failure rates than the more 11 1 robust low-voltage metal-enclosed 86-1 86-2 86-3 switchgear. It is certainly acceptable to 2 use multiple segments of busway to 22 2 feed protector circuits into the switch- 50/51 50/51 50/51 gear, where the redundancy of busway NC NC 3 PH. A,B,C PH. A,B,C PH. A,B,C circuits prevents loss of power to loads Tie Tie for a single busway fault or failure. N N N N 86-T 4 Control voltages for network protec- GFR-1 GFR-2 GFR-3 tors are usually 120 Vac and derived internally from the transformer sec- Feeder Feeder Feeder Breakers Breakers Breakers 5 ondary or within the protector itself, Loads Loads Loads thus protectors are self-contained GRN regarding control power. The low- (Ground Return Neutral) 6 voltage switchgear assembly may be GFR-T ac or dc with ac control power being Ground Bus more popular. The ac current control 7 systems use a control power trans- Figure 18.0-10. One-Line for Three-Unit Spot Network Protectors as Mains 1 former on the incoming of each Protectors are fused for three- and four-unit spot networks. 2 protector circuit with a control power Fuse location. 8 transfer system on the secondaries of all control power transformers to pick the first live source. The control power Primary Switch 9 circuits are always energized so long as at least one protector is closed. Network Transformer 10 The addition of main meters for power monitoring, overcurrent relays and communication trip units generally Network Protector 11 take very little space and can be accommodated without adding space Busway or Cable if the switchgear layout rules and 12 standards are followed. It is possible to monitor other non-switchgear equip- ment by adding space for the required 13 number of communicating devices Low-Voltage Drawout that monitor remote contacts wired to Switchgear the switchgear for status and alarming Aux. Aux. Aux. FDRS Sections Tie FDRSSections Tie FDRS Sections 14 at a remote power monitoring and control system, such as transformer temperature and pressure alarms. Figure 18.0-11. Floor Plan for Three-Unit Spot Network System 15 7. Use of Current Limiting Fuses Network systems that use air power In two transformer spot networks, Generally, this issue needs to be breakers and deliver more than one can argue that the protectors 16 addressed in the design stage of a 65,000 A of fault current should do not need to be fused for any project, prior to specification writing. use feeder breakers such as Eaton’s application up to and including Protectors are usually applied with Magnum™ DS breakers rated up 3000 kVA transformers. The principal 17 fuse limiters on the load-side of each to 100,000 A. logic is that the Tie can experience only the fault current from one protector, but there can be exceptions Network protectors are normally to using the limiters on protectors. transformer and that the Tie protective 18 equipped with load-side fuses trip settings provide faster acting The expected fault currents need to be (usually partial range current limiting) backup protection than the protector calculated for several locations, including and serve as backup protection should fuses for reverse power conditions. 19 secondary windings of transformers, the protector fail to open on reverse network switchgear bus (both sides of fault current conditions. Air power When protector fuses are used, the Tie breakers), and at the load-side of breakers are now available with kAIC system needs to be designed with 20 feeder breakers. ratings of 65, 85, 100 and 200 kAIC, interlocking to ensure that the fuses without fuses. are not accessible unless the protector and network disconnect are opened. 21

CA08104001E For more information, visit: www.eaton.com/consultants 18.0-12 Spot Network Equipment Discussion May 2017 Sheet 18 012 Commercial Spot Network Design Considerations

In this example, a two-unit network i with 1000/1500 kVA dry transformers Network Network Network Network AA/FA, 80 °C rise are used. The Transformer Protector Protector Transformer transformers are configured delta-wye ii with 13.8 kV primary, a 480 V wye secondary, and the impedance of each is within the range of 5.75–7.00%. Eaton 1 Busway or Type CM52 Network Protectors are Cable Tray rated 1875 A and are mounted within low-voltage switchgear structures. The 2 CM52 is a deadfront, drawout protector Low-Voltage Drawout whose operation is very similar to the Switchgear air power circuit breaker used through- 3 Aux. FDRS Tie FDRS Aux. out the switchgear to distribute power Sections Sections to the outgoing circuits. The network relay used within the CM52 is the MPCV 4 type, a microprocessor-integrated Figure 18.0-12. Floor Plan for Double-Ended Network Substation—Switchgear Mounted solid-state relay that allows for field Network Protectors programming the network characteris- 5 tics. All CM52 protectors are factory Source Source wired for application of remote trip #1 Bus #2 Bus and lockout functions, which will be 6 used in our example via the 86 lockout Primary Medium Voltage Devices relay and separate 50/51 protective relay. #1 #2 7 Note that the two network protectors are To Other not fused. Spot Networks The 50/51 relay will use 2000/5 ratio 8 Two Position current transformer inputs from current Fusible Primary transformers mounted on the load- Switch KK KK side of each protector within a transi- 9 65E tion box. The 50/51 device may be a CLE Fuse solid-state relay, Digitrip 3000, due to its broad range of field programmable 10 settings. Thus, the protectors are used 1000/1500 kVA as main overcurrent protective devices Dry Transformer as well as protectors. When transform- 11 AA/FA ers are remote from the switchgear, the current transformers must be located within a transition box atop the protec- 12 86 86 tors. The current transformers may 1875A CM52 be used for metering also, or if more Non-Fused Protector accurate metering at lower current 13 50/51 2000A 50/51 levels is desired then a second set may be necessary in the switchgear with Tie multi-ratios to match the average load demands. 14 NC The low-voltage assembly uses Eaton 15 Typical Magnum DS Magnum DS breakers for both Tie and Feeder devices. The Tie breaker will be an MDS-620, 2000 A frame, 1600 A 16 trip, electrically operated, drawout design, incorporating the Digitrip 520 Figure 18.0-13. Example of Two-Unit Spot Network Coordination Issues—Protectors as Mains trip unit. The feeder breakers are a mix 17 with Overcurrent Relaying of 800 A frame and 1600 A frame to 8. Network Device Coordination The medium-voltage switches are serve the outgoing feeder circuits. The fused air type. The switches have two switchgear will panel mount the two 18 By way of example, we shall illustrate positions, open and closed, not three 50/51 relays, which provide overcur- the level of coordination possible in positions. We recommend that the rent protection for the protectors. a typical two-unit network system primary switches use key interlocks In this example, the fault currents 19 as shown in Figure 18.0-13. In this with protectors to ensure that the example, two networkable primary are less than 65 kA; however, systems protectors are used to break and make having higher fault currents can be sources are available and several load currents, although this interlock- transformers are presumed to be fed accommodated using higher-rated 20 ing is not absolutely necessary because Magnum DS breakers. from each of the two primary circuits. the switches are load-break rated. The upstream primary device is a 21 13.8 kV vacuum circuit breaker with a complement of relaying.

For more information, visit: www.eaton.com/consultants CA08104001E Spot Network Equipment 18.0-13 May 2017 Discussion Sheet 18013 Commercial Spot Network Design Considerations

General Discussion—Coordination Curves Eaton CME 65E Power Fuses The fuse meets the NEC stipulated The protective device settings for a The selected current limiting fuse, 65E, protection, but lacks the flexibility i two-unit spot network are similar to provides little if any overload protec- of a relay with nearly continuous those used for a standard double- tion for the transformer, however, it adjustments. If superior protection ended substation. The goal is to serve does an acceptable job of supplying is desired, then a vacuum breaker ii both continuity of service and protec- NEC code mandated short circuit with 50/51 relaying should be used tion equally. Settings should not favor protection for the 100% damage curve. in lieu of the fused primary switch. either one or the other, but rather should The fuse cannot provide protection Do not use 50/51 relaying on a load 1 keep loads served if at all possible for the 58% curve and downsizing the interrupter switch. and minimize nuisance outages even selected rating lower than 65E is likely under serve fault conditions, including to result in nuisance fuse operation. 2 ground fault events. Basically, settings Each power fuse vendor has application should be implemented which allow tables and charts to properly select the closest upstream device near a fuses for any application. 3 fault to clear before other upstream devices trip. Faults in a network have 4 more than one source, which is a major 100 1000 10000 100000 difference compared to double-ended 1000 substations with a normally open Tie breaker. 5 R In Figure 18.0-14, we plot the time- current curves of the medium-voltage 6 power fuses, whose main function is to provide short circuit protection to 100 each transformer, the ANSI damage 7 curve typical for the transformers, the 50/51 relaying upstream from each spot network, the Tie and Feeder 8 device trip curves, and the 50/51 relay- ing used by each protector. We have shown the primary 50/51 protective 10 9 relaying curves by postulating their relative position as being to the right of each damage curve and to the left of 10 TIME primary cable damage curves, because T3 several transformers are served by T1 each primary service. In other words, 11 several vault locations exist in the facility. 1.0 Obviously, these primary relays cannot P 12 protect each transformer individually, F nor is it desirable to do so because it is better to isolate a simple faulted T transformer with a power fuse than 13 to open the entire primary circuit. MAG 0.1 The following paragraphs detail the 14 protective device settings, discuss the 3MAG curves, and review the important issues. B 15 ANSI Transformer Damage Curves Two curves are plotted: both the 100% and the 58% damage curves are shown 0.01 16 for the dry types in our example. These CURRENT (Amperes) curves are defined in ANSI Standard Legend: 141. The 58% curve reflects the fact R Primary 50/51 Relaying—Typical for These Transformers 17 that a one per unit secondary fault on T3 100% ANSI Damage/Withstand Curve for Transformer T1 58% ANSI Damage/Withstand Curve a grounded wye transformer creates F Power Fuse 65E Rating a 0.58 per unit fault in the primary P Network Protector Relay 50/51—(Both LTD = 40 Seconds and 6 Seconds Shown) T Tie Breaker 1600AT MAG = 1 TX INRUSH 18 conductors when the primary windings B Feeder Breaker 800AT 3MAG = 3 TX INRUSH have a delta configuration. Figure 18.0-14. Two-Transformer Spot Network Phase Overcurrent 19

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CA08104001E For more information, visit: www.eaton.com/consultants 18.0-14 Spot Network Equipment Discussion May 2017 Sheet 18 014 Commercial Spot Network Design Considerations

Protector Relaying—Eaton Digitrip 3000 Tie Breaker—Eaton MDS 2000 A with These settings provide for fast action i Plus Ground Fault Relay (GFR) Digitrip LS Plus Ground Fault Relay of feeder devices experiencing the Network relays do not have any form The settings shown in Figure 18.0-14 maximum fault duty of the switchgear of forward 50/51 (instantaneous and were developed using 2000/5 sensors (fault current from two transformers). ii time overcurrent) protection, therefore on the Tie breaker. The settings Ground fault protection is recom- if it is desired it must be added recommended are: mended for the feeder trip units; these separately. An 86 lockout relay is settings can be coordinated with the 1 recommended for positive lockout Long Time Pickup two-stage ground fault detection (LTPU) = 0.8 (1600 A) system (single point ground return indication and reset operations. The 2 curve for the Digitrip 3000 is shown in Long Time Delay I t method) mentioned earlier in 2 Figure 18.0-14 and depicts the settings (LTD) = 2 seconds Figure 18.0-8. Suggested ground for this microprocessor-based solid- Short Time Pickup fault protective device settings are state multi-phase relay. Using the (STPU) = 3 X (4800 A) illustrated in Figure 18.0-15, and the 3 2000/5 ratio current transformers, Short Time Delay settings are listed under the protector, the settings are as follows: (STD) = 0.2 seconds Tie breaker, and feeder device Instantaneous discussion in this section. 4 Long Time Pickup (INST) = Not used (LTPU) = 1.0 (2000 A) Ground Fault Relay Ground fault settings are established Long Time Delay I2t (GFR) = 700 A pickup essentially the same as a double-ended 5 (LTD) = 40 seconds Ground Fault Relay substation using a single tee ground Short Time Pickup (GFR) = 0.58 seconds point and ground return methodol- (STPU) = 3 X (6000 A) (35 cycles) ogy. Eaton’s MDS feeder breakers are 6 Short Time Delay See set to coordinate with downstream (STD) = 0.3 seconds Figure 18.0-15 devices so that downstream breakers Instantaneous experiencing a fault trip first. The GFR 7 (INST) = 11 X (22000 A) These settings allow the Tie to act relays for the Tie and protectors are Ground Fault Relay quickly for abnormal current condi- set slightly higher in pickup and have a (GFR) = 700 A pickup tions, yet also provide enough delay longer delay than the ground fault for 8 Ground Fault Relay to allow protectors to trip on reverse the feeder devices. Protector and Tie (GFR) = 0.58 seconds current when protector operation is ground fault settings are usually set (35 cycles) the prudent first course of action. at the same levels; coordination is 9 Also, larger feeder devices, such achieved by interlocking the two It is very important that the protector as 1200 A breakers (not shown in stages so that the Tie stage operates 50/51 settings be slower than the Tie Figure 18.0-14) will easily fit to the first followed by the protector stage. 10 breaker. The faster acting Tie is left and beneath the Tie curve. It is Ground current originating from faults desired for isolation of switchgear important to set the Tie to operate in the switchgear buswork or incoming faults between one side of the Tie and quicker than the protector 50/51 conductors is directly measured by 11 the load-side of a protector without relaying. The faster Tie settings assure the GFR on the Tie, then by one of taking the whole network down. The that switchgear bus faults do not take the protectors after the Tie opens. Tie clears one transformer’s fault the entire service down (only half). In Subsequently, the GFR on the faulted 12 contribution, while the unfaulted our example, the Tie will only be called zone causes the protector experiencing side remains energized. The protector upon to interrupt the fault current from the fault to trip open thereby isolating experiencing the remaining fault one transformer. the fault completely. Downstream 13 current will subsequently trip open, ground faults are cleared by down- thereby isolating one-half of the Typical Feeder—Eaton MDS 800 A with stream circuit breakers or the DS feeder network bus for repair. Digitrip LSIG breaker serving the faulted circuit. 14 The settings in Figure 18.0-14 were Faults located in the transformer generated using 800/5 sensors applied secondary windings may open both on the feeder breakers. The Digitrip 520 15 the Tie and the protector, depending trip unit settings are: upon the magnitude of the event. The protector should open first upon Long Time Pickup 16 reverse power, because protectors (LTPU) = 1.0 (800 A) respond to reverse power in 7 cycles. Long Time Delay If the Tie also trips open, the Tie can be (LTD) = 2 seconds 17 reclosed to serve the entire load again Short Time Pickup after locking out the protector on the (STPU) = Not used faulted transformer. Short Time Delay 18 (STD) = Not used Note: The transformer is given superior Instantaneous overload protection by the Digitrip 3000 compared to the level of protection given (INST) = 2 X (1600 A) 19 by the power fuse. This is especially true Ground Fault Pickup even in the overload region of the ANSI (GFPU) = F (500 A) damage curve. Ground Fault Delay 20 (GFD) = 0.3 seconds (18 cycles) See 21 Figure 18.0-15

For more information, visit: www.eaton.com/consultants CA08104001E Spot Network Equipment 18.0-15 May 2017 Discussion Sheet 18015 Commercial Spot Network Design Considerations

Zone Selective Interlocking— Application Note i The key reason to use Spot Network Systems is the superior ability to delivery power to loads, even under ii conditions of circuit failures, especially primary circuits or transformer failures. Designers need to keep that 1 fact in mind when considering the use of zone selective interlocking (ZSI). 2 ZSI is a tool to reduce arc fault energy and decrease tripping times of over- current trip units and relays, and is a 3 very reasonable tool to consider in radial systems and double-ended switchgear configurations with an 4 open tie breaker. However, the use of ZSI within the 208 V or 480 V switch- gear is not recommended by Eaton. 5 Here are the key reasons to avoid ZSI with Spot Network Switchgear. 6 The use of ZSI places all devices in a “trip fast without any delay” mode of operation, despite the short-time 7 pickup and delay settings set within the overcurrent device. The only way the overcurrent devices follow their 8 preprogrammed delay settings is if they get a restraint signal from downstream overcurrent devices. 9 The restraint signal is a low-voltage signal sent over hardwiring and forces several layers of overcurrent devices 10 into an orderly tripping sequence such that only the device closest to the fault trips, leaving unfaulted circuits 11 energized serving loads. In Spot Networks, primary faults are 12 expected to be cleared by upstream relaying and arc interrupting devices, such as breakers, and the reverse 13 current functional protection supplied by network relays. However, network relays take approximately 5–7 cycles 14 to clear under reverse current conditions. When ZSI is used within the switchgear, the mains and ties 15 experience fault currents, some mains Figure 18.0-15. Spot Network Ground Fault Protection see forward fault currents and at least one Main will see reverse current until Eaton Engineering Services has been There remain other tools to reduce the 16 the protector clears in 5–7 cycles. Not called into facilities to troubleshoot tripping times of overcurrent devices, one feeder breaker sends any restraint problems of lost networks when such as Arcflash Reduction Mainte- signal to tie breakers that are normally primary faults occurred, and the nance System functions, placed into 17 closed. This arrangement of ZSI causes problem was identified as the improper service in network switchgear when the the ties to trip without any delay, faster use of ZSI. After ZSI was removed from system is maintained in an energized than the time it takes the protector the switchgear, the network system state. Eaton even offers this type of 18 to clear, and the mains never get the functioned as expected, which is to feature on network protectors. restraint signal from the ties and the isolate only the faulted bus or system segment and allow loads to be served Designers are encouraged to properly whole system can be taken offline due design Spot Networks and to edit 19 to a fault on a single primary circuit. from the network switchgear by unfaulted sources. project specifications so that ZSI is not used in Spot Network Switchgear. Because ZSI is a part of standard 20 office and company specifications, it requires careful diligence to remove ZSI from specifications. 21

CA08104001E For more information, visit: www.eaton.com/consultants 18.0-16 Spot Network Equipment Network Protector Equipment May 2017 Sheet 18 016 Liquid-Type Network Transformers

FR3 Advantages i Liquid-Type Network Transformers The primary switch is interlocked with FR3 is a natural ester fluid made the associated network protector and from renewable and biodegradable ii secondary transformer windings to vegetable-based oil. Below are some ensure that the switch is only used to of the environmental, fire safety and break or make magnetizing current. operational advantages of using a high temperature natural ester liquid. 1 Liquid network transformers have a special low-voltage flange for field Environmental Advantages 2 mounting a network protector on the ■ Even though secondary containment secondary flange. The protector is best is still required, FR3 spills can be mounted close to the secondary wind- disposed through normal means 3 ings of the associated transformer and not treated as hazardous or to minimize distance between the toxic waste windings and the protector contacts. ■ FR3 minimizes air pollution by 4 There are only two standard ANSI producing only carbon dioxide flange configurations, smaller and and water during combustion larger, and the user generally gets one ■ based upon the transformer kVA size. FR3 also offers the potential for 5 relief from government regulatory Typical Liquid Network Transformer It is possible to chose one over the other, but the specifier must be careful penalties, resulting in less costly Network transformers are available in the selection and make certain spill cleanups 6 with liquid immersed core and coil adequate load growth and redundancy Fire Safety Advantages assemblies, and use the liquid as the are built into the system when ■ FR3 offers greater risk mitigation on principal insulation means for primary choosing a small flange size for a collateral damage from transformer 7 and secondary windings. The fluid transformer that normally is supplied explosion and fire, potentially can be mineral oil, silicon or a biode- with a large flange for a higher lowering insurance premiums gradable form of vegetable oil. Indoor ampacity protector. If the specifier 8 ■ applications benefit from using silicon stays with the Eaton recommendations Active fire suppression and barrier or the biodegradable vegetable oil for sizing protectors, the flange size is walls can essentially be eliminated liquid dielectric. See the discussion properly chosen for every unit. with FR3 when minimal spacing 9 below for Cargill FR3. is maintained Liquid transformers are available with ■ FR3 can alternatively be used safely The transformers are built to ANSI an array of accessories, most of which indoors and in tighter spaces out- C57.12.40 standards and have an 10 are listed on the next page with the doors typically without additional integral primary non-load-break three- outline drawings of a typical liquid fire safety requirements position switch having connected, network transformer. Alarm contacts ■ FR3 is listed as a “less flammable” 11 open and grounded positions. The are usually wired to terminal boxes for dielectric fluid by Factory Mutual grounded position grounds the use on alarm schemes or monitoring. (FM Global) and is classified as incoming medium-voltage feeder Certain accessories allow for the sam- a “less hazardous” dielectric 12 that serves the transformer, and does pling of fluids at regular maintenance medium in respect to fire hazard not ground the primary windings. intervals for testing and analysis. by Underwriters Laboratories (UL) 13 Table 18.0-2. Typical Properties of Insulating Fluids Operational Advantages Description Mineral Oil FR3 Silicone ■ FR3 impregnated paper experiences 14 Electrical a much lower aging rate compared to mineral oil impregnated paper, lead- Dielectric strength, kV (ASTM D877) 30 40 43 ing to an increase in the insulation 15 Physical system lifetime (grid reliability) Viscosity, cST. 100 °C 3 11.5 16 ■ FR3 impregnated paper can (ASTM D445) 40 °C 12 110 38 alternatively operate at a higher 16 0 °C 76 2200 90 hotspot temperature and attain the Flash pt. °C (ASTM D92) 145 285 300 same life expectancy as mineral oil Fire pt. °C (ASTM D92) 160 308 330 impregnated paper, increasing the 17 Specific heat (cal/gr/°C) (ASTM D2766) 0.43 0.45 0.36 transformer peak load or overload Coefficient of expansion, /°C (ASTM D1903) 7.55 x 10–4 7.30 x 10–4 1.04 x 10–3 capacity (energy efficiency) 18 Pour pt. °C (ASTM D97) –40 –24 –55 Sp. gravity (ASTM D1298) 0.91 0.87 0.96 Color (ASTM D1500) 0.5 0.5–2.0 <0.5 19 Environmental Biodegradation Rate (%) 21–day CEC–L–33 25.2 27.1 0.0 20

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For more information, visit: www.eaton.com/consultants CA08104001E Spot Network Equipment 18.0-17 May 2017 Network Protector Equipment Sheet 18017 Liquid-Type Network Transformers

Sealed Tank—Braced for 15 PSI (103 KPA)—Color Network Black. i Base-Bar Type—0.75 (19.0) x 1.50 (38.0). Jacking Areas—4 Total. Lifting Hook for Lifting Complete Transformer. ii Welded Cover with Gasket and Lifting Loops for Lifting Cover Only. 1.00 (25.4) Filling and Upper Filter Connection. Bolted Manhole—12.50 (318.0) x 12.50 (318.0) Opening with Cortite Gasket. 1 Relief Device—Over a 7.00 (178.0) Handhole. Cap with 2.00 (51.0) Square Head for Access to De-energized Tap Changer (with Key Interlock, Coordinated with HV Switch). Item . LV Throat—Per ANSI C57.12.40 Figure 3. 2 LV Bushing—3 Total. XO Bushing Style 8D11227G02—Spade 1.75 (44.0) NEMA Drilled. 3.75 (95.0) Wide x 0.5 (13.0) Thick Spade. 1.00 (25.4) Drain Valve with Bronze Pipe Plug. 3 Ground Pads—2-Hole NEMA Drilling—02 Total. Magnetic Liquid Level Gauge with Alarm Contacts. 80.50 (2044.7) Vacuum Pressure Gauge with Alarm Contact and Air Test Valve. Overall & Shipping Length Liquid Temperature Gauge with Alarm Contacts. 4 Rapid Pressure Rise Relay. 35.50 (901.7) Control Cabinet—with Undrilled Entrance Plate. 21.40 Bolted Manhole—12.50 (318.0) x 12.50 (318.0) Opening 5 (543.6) with Cortite Gasket. H.V. 3-Position Magnetic Break Disconnect and Grounding Switch Operating Mechanism with Provisions for Padlocking, with X0 6 Key Interlock. Locked in Open or Ground Positions, Coordinated with Tap Changer. Item ቪ and Second Key Interlock. Locked in 27.90 Closed Position and Coordinated with Low-Voltage Protector. (708.7) 7 1.00 (25.4) Filling Coupling. 22.00 (558.8) Magnetic Liquid Level Gauge. CL 46.90 Switch Positions—Top to Bottom, Ground, Closed, Open. Tank X3 ቩ (1191.3) 8 Switch Cover with 0.50 (13.2)— 3 Taps for Jack Screws (Bolted on). X2 Terminal Chamber Cover with 0.50 (13.2)— 3 Taps for Jack Overall & X1 Screws (Bolted on). Shipping Nameplate and Warning Plate. Length 9 H.V. Terminal Chamber. 1.00 (25.4) Drain Coupling. Plan View Terminal for #2 to 4/0 Cable Range—3 Total. 2.50 10 Entrance –3 G & W Stuffing Boxes. Catalog Number RS33-G1, 4.50 (114.0) CL to CL. (63.5) 0.50 (13.2) Air Test Fitting with Bronze Pipe Plug. 0.50 (13.2) Top Liquid Sampler with Bronze Pipe Plug. 11 0.25 (6.0) Fluid Level Plug. Interlock Bushing. 36.30 (922.0) 25.30 To Switch Entrance) 12 (642.6) 13 XO 14 67.00 4.10 75.4 (1701.8) (104.1) (1915.2) Over Shipping Height 15 Tank 16.60 62.00 (421.6) (1574.8) 16 To XO 47.40 (1204.0) 42.00 (1066.8) 17 25.40 Over Switch Centerline (645.2) LV Throat Entrance To Cab 18 14.80 23.70 23.70 19 1.50 (375.9) 3.90 (602.0) (602.0) (38.1) 29.60 (99.1) 53.40 (1356.4) (751.8) Base Length 20 Side View Front View 21 Figure 18.0-16. Outline Drawing—750 kVA, 55/65 °C Rise, 13,750 Delta to 480Y/277 Volts

CA08104001E For more information, visit: www.eaton.com/consultants 18.0-18 Spot Network Equipment Network Protector Equipment May 2017 Sheet 18 018 Dry-Type Network Transformers

Dry-Type Network Transformers Dry-type network transformers have i a special low-voltage flange for field mounting a network protector on the secondary flange. The protector is ii best mounted close to the secondary windings of the associated transformer to minimize distance between the 1 windings and the protector contacts. There are only two standard ANSI flange configurations, smaller and 2 larger, and the user generally gets one based upon the transformer kVA size. It is possible to chose one over the 3 other, but the specifier must be careful in the selection and make certain adequate load growth and redundancy 4 are built into the system when choosing a small flange size for a transformer that normally is supplied 5 with a large flange for a higher ampacity protector. If the specifier stays with the Eaton recommendations 6 for sizing protectors, the flange size is properly chosen for every unit. 7 Dry-type transformers can be close- coupled to LV drawout switchgear with protectors, tie and feeder devices all 8 switchgear mounted. Dry-type network transformers are available with an array of features, 9 most of which are listed on the next page with the outline drawings of 10 a typical dry network transformer. A transformer monitoring package Typical Dry-Type Network Transformer is usually included with temperature readings, RTDs and Alarm contacts. 11 Network transformers are available Two narrow-design MVS switches Most designs have knock-down with dry-type core and coil assemblies, may be configured, as shown in enclosures for ease in rigging a and use special polyester resin or Figure 18.0-17, to provide for the unit into position through hallways 12 cast epoxy as the principal insulation ground position. and doorways. means for primary and secondary windings. The choice depends upon 13 the economics of the project. Indoor applications benefit from using dry-type networks because no K K 14 containment or sampling of liquid dielectric is needed. Eaton strongly recommends 80 °C rise cast coil 15 transformers for use in spot network systems. Figure 18.0-17. MVS Switches 16 The transformers are built to ANSI C57.12.57 standards and do not have Eaton can also supply close-coupled an integral primary switch, unless a primary switchgear with a two-breaker 17 two-position switch is added to the (VCPW) transfer capability on the primary. The process of grounding the primary of cast coil dry-type network incoming medium-voltage feeder that units. The proximity of vacuum breakers 18 serves the transformer becomes a will mandate using RC snubbers manual process of adding grounding within the transformer. cables. The two-position primary 19 switch is usually load-break rated and is not interlocked with the associated network protector and secondary 20 transformer windings.

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For more information, visit: www.eaton.com/consultants CA08104001E Spot Network Equipment 18.0-19 May 2017 Network Protector Equipment Sheet 18019 Dry-Type Network Transformers

Characteristics ■ i 2.25 Enclosure: NEMA 2 (indoor Total of Two (57.2) ventilated with drip-proof roof) Jack Screws ■ 0.50–13 UN Finish: ANSI 61 ii 3.00 Ventilated Surface ■ Product type: Cast/Cast (76.2) Front and Back ■ kVA: 1000/1500 ■ HV: 13,200 1 TEMPERATURE MONITOR OR ■ CUTOUT PROVIDED HV kV BIL: 95 3.38 ■ LV: 480Y/277 2 (85.7) 5.44 NAMEPLATE ■ LV kV BIL: 10 77.00 (138.1) ■ Taps: 12,540/12,870/13,200/ (1955.8) 13,530/13,860 3 ■ Impedance: 5% 1.25 8.38 ■ Temperature rise: 80 °C (31.8) 1.50 (212.9) 4 (38.1) ■ Cooling class: AA/FA ■ Hertz: 60 ■ 5 108.00 Phases: 3 (2743.2) ■ LV windings: Cu Front View ■ HV windings: Cu 6 ■ 12.00 Sound level: 64 dB (304.8) ■ Approximate weight: 9.00 10,200/4627 lb/kg 7 (228.6) ■ Provisions for mounting network X0 12.88 (327.0) protector on the left end 8 ■ Primary is cable connected to closed C 9.50 coupled primary switchgear, such L (241.3) as MVS 5.00 5.00 9 (127.0) 32.88 X3X2X1 (127.0) (835.0) Accessories 33.00 0.56 x 1.06 67.63 ■ 10 60.00 (838.2) (14.2 x 20.6) (1717.7) Braced for seismic (1524.0) Slots ■ ANSI 61 9.00 ■ LV end sheets (228.6) 9.00 11 27.13 (228.6) ■ Standard ventilation (689.0) ■ Aluminum screens ■ Copper ground bus (0.25 x 2.00) 12 66.00 (1676.4) ■ Neutral disconnect link ■ LV End View UL listing 13 ■ Control panel ■ Control power supplied by ABB 1.50 ■ Forced cooling 14 (38.1) 30.00 0.56 x 1.06 (762.0) 15 3.00 (14.33 x 27.0) (76.2) Rects 1.88 90.00 (47.6) 16 (2286.0) 36.00 8.00 (914.4) (203.2) 17 8.00 1.13 (203.2) (28.6) 8.88 (225.4) 17.13 18 H1 H2 H3 (435.0) 51.00 19 (1295.4) 66.00 (1676.4) HV End View 20

Figure 18.0-18. Outline Drawing—1000/1500 kVA Cast Coil Network Transformer, 80 °C/100 °C Rise, 13,800 Delta to 480Y/277 Vac Wye 21

CA08104001E For more information, visit: www.eaton.com/consultants 18.0-20 Spot Network Equipment Network Protector Equipment May 2017 Sheet 18 020 Type CM52 Network Protectors

i Type CM52 Network Protectors

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6 CM52 Drawout 7 Network Protector Ratings Several network protector models currently exist to satisfy 8 Typical Enclosed CM52 Network Protector all location requirements. The new CM52 design covers all of these ratings, giving you one type of protector to handle Quality Designed to be Smarter, Safer and Streamlined all installation needs. The styles available include internal 9 or external fuse mountings and submersible or indoor The CM52 Network Protector provides the highest level enclosures throughout the current and voltage ratings. of reliability and service continuity available today. An Having parts and accessories common through all protector intelligent protective device, the CM52 Network Protector is 10 ratings means lower maintenance and inventory costs. The designed to handle ratings from 800 to 4500 A, 216 to 600 V. CM52 was also designed with higher interrupting and fault This new network protector features an electrically operated, close ratings than older protector models. This higher rating composite case, spring closed air network circuit breaker 11 allows for safer installations and better protection on a controlled by the MPCV network relay. network system. The CM52 meets or exceeds the standards in IEEE® C57.12.44. Table 18.0-3. CM52 Ratings Table—Ratings through 480 Volts Wye 12 This ensures a product with the highest performance standard applicable to a network protector. A first for Continuous Interrupting Close Suggested Transformer network protectors, the CM52 is setting a new standard Current Rating and Latch Rating (kVA) Rating Rating 13 by being UL-qualified. This third party approval certifies 216 V 480 V the delivery of a quality product. A UL-qualified network 800 42 35 225 500 protector means easier code approval for quicker system 1200 42 35 300 750 14 start-up and less approval time and costs in a non-utility 1600/1875 42 35 500 1000 environment. 2000 42 35 600 1000 2500/2825 65 45 750 1500 15 UL listed and labeled CM52 protectors are presently 3000 65 45 1000 2000 available through 4500 A. Contact Eaton and the protector 3500 85 65 1000 2000 product line for more details on UL listed and labeled 4500 85 65 1000 2000 16 CM52 network protectors.

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For more information, visit: www.eaton.com/consultants CA08104001E Spot Network Equipment 18.0-21 May 2017 Network Protector Equipment Sheet 18021 Type CM52 Network Protectors

Type CM52 Network Protectors The CM52 is a low maintenance The Intelligence of the network protector. It requires no i mechanism adjustments, is easier Protector—MPCV Relay to troubleshoot and has built-in diagnostics. Maintenance time is no Within the CM52 lies its intelligence, ii longer needed for the adjustment of the MPCV Network Relay. The protector contacts. Troubleshooting programmable MPCV Network is much easier with the CM52 through Relay brings the proven performance 1 color-coded wiring and a front of microprocessor-based technology accessible test block. Diagnostics to the CM52 Network Protector. are built into the Indicating Diagnostic This programmable relay offers 2 Module. The IDM replaces the multiple selections to meet the traditional manual adjustment of the requirements of each network min. motor pick-up adjustable resistor protector installation. With the MPCV, 3 and offers diagnostic indicators for you can select between the traditional available control voltage for the straight-line master close curve and motor, spring release and trip circuit. modified circular close curve. Our 4 With the new CM52, maintenance enhanced sequence-based algorithm becomes easier and protector down- provides exceptional performance CM52 Secondary Contacts time decreases, saving money and and stability over a wide range of 5 Protector downtime is both frustrating increasing reliability. temperatures and voltages in and costly. No mechanism adjustments, Much more manageable at less comparison with a power-based 6 few replacement parts, color-coded than half the weight of older network algorithm. Additionally, the anti- wiring, diagnostics, and a protected protectors, the protector is easier to pumping feature on the MPCV relay motor are key contributors to the handle, resulting in less time in vaults, protects the motor under damaging 7 high-level service reliability and and lower labor costs. A four-position, system conditions. reduced downtime of the CM52 drawout, deadfront circuit breaker Network Protector. makes testing quick and safe, curbing Communications 8 maintenance time and costs. The dead- The MPCV relay has built in communi- front provides worker safety, drastically cation capabilities for monitoring reducing the possibility of live electricity and control of the network protector. 9 accidents during inspection. A front This allows users to access and accessible 6-point test block provides display information from the relay safe and easy connection of test including voltage, current, energy 10 equipment during testing, phasing usage, power quality, and last trip and troubleshooting. details. Control of the protector is possible from a remote location, 11 Quality was the focus through the providing safer conditions and design to the manufacturing of the quicker response time. new CM52 Network Protector. The 12 circuit breaker in the CM52 goes The relay can also communicate other through a 100-point testing procedure information about the network protec- ® CM52 IDM in an ISO 9000 breaker specialty tor’s environment through standard 13 plant. The quality design and testing auxiliary inputs. Information such of the CM52 virtually eliminates the as water or pressure loss inside the need for later adjustments and network housing, or erratic internal 14 insures a reliable product. enclosure temperature will send an alert notifying of problems in the vault. The relay has the capability of 15 communicating information to a Data Concentrator/Translator (DC/T) over a shielded twisted pair of 16 communications wires. Information is obtained through a utility’s SCADA protocol and/or Eaton’s 17 software program. 18

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CA08104001E For more information, visit: www.eaton.com/consultants 18.0-22 Spot Network Equipment Network Protector Equipment May 2017 Sheet 18 022 Type CM52—Features, Functions and Benefits

Table 18.0-6. CM52 Ratings Comparison Table—Rating Tested at 600 Volts i Features, Functions and Benefits Continuous Breaker CM52 IEEE/ANSI Current Rating Element Interrupting Close & Latch Interrupting Close & Latch 1 1 (Amperes) Width— Rating (kA) Rating (kA) Rating (kA) Rating (kA) ii 1. Standardized Breaker Frames: Inches (mm) Only three basic breaker frames of minimal physical size are used 800 17.00 (431.8) 42 35 30 25 throughout the CM52 to provide 1200 17.00 (431.8) 42 35 30 25 1 1600/1875 17.00 (431.8) 42 35 30 25 different electrical ratings. 2000 17.00 (431.8) 42 35 35 35 Table 18.0-4. CM52 Sizes 2500/2825 22.00 (558.8) 65 45 60 40 2 3000 22.00 (558.8) 65 45 60 40 Ampere Breaker Size—Inches (mm) Rating 3500 35.00 (889.0) 85 65 60 40 Width Height Depth 4500 35.00 (889.0) 85 65 60 40 1 3 800–2000 17.00 (431.8) 17.00 17.00 Close & Latch ratings apply only to spring close and stored energy mechanisms. 2250–3000 22.00 (558.8) (431.8) (431.8) 3500–4500 35.00 (889.0) 6. Four Breaker Element 8. Low Maintenance: The breaker 4 Drawout Positions: has no adjustments required 2. Light Weight Breaker Element: over the life of the unit and fewer A reduced breaker physical size a. Connected—Fully connected replacement parts than traditional 5 also results in a substantial weight to primary and secondary units. A built-in wear gauge shows reduction compared to existing connections. The door may be the acceptable limit of contact wear, Network Protector designs. open or closed in this position. making the breaker condition easier 6 b. Te s t —Primary clusters are to identify for service periods. Table 18.0-5. CM52 Weights disconnected, secondary Ampere Weight in Lb (kg) wiring disconnects are made. 7 Rating CM52 Breaker Comparable Testing can be performed on Element Breaker the unit at this point without 800–2000 170 (77) 400 (182) disturbing the power connec- 8 tions. The door may also 2250–3000 185 (84) 550–650 (250–295) be opened or closed in this position. 9 3500–4500 350 (159) 700–1300 (318–590) c. Disconnected—Primary clusters are disconnected, 10 3. 10 kV BIL (Basic Impulse Level): secondary disconnects are Impulse testing is the application open. The door must be open of a high surge voltage on equip- in this position. 11 ment to simulate possible surges d. Removable position—Breaker caused by lightning. Although not element can be removed from defined or required by IEEE/ANSI its rails. The door must be open Easy Inspection C57.12.44, this test provides an with the breaker element in 12 9. Sealed Motor Gear Box: additional measure of safety and this position. performance to the design. (The Charges closing spring in less than 13 test was performed at 1.2us x 50 7. Standardized Modular Components: 1-1/2 seconds. us wave shape on a 3 x 3 grid.) The motor, shunt trip, spring release coil, arc chutes, IDM, 10. Indicating Diagnostic Module (IDM): 4. Deadfront Drawout Breaker: auxiliary switches and multi-ratio Replaces the traditional Motor 14 Protects the user from accessing CTs are easily removable, and Close Relay and adjustable resistor, live circuits. Eaton offers the only main components are standard and offers diagnostic indicators deadfront drawout breaker designs across different ratings. This on available control voltage for 15 in the Network Protector industry. allows reduced part inventories the motor, spring release and and reduced training for shop “trip actuator.” 5. Improved Interrupting and Fault and field crews. 16 Close (Close & Latch) Ratings: 11. Front-Mounted Test Points: Easy Improved interrupting and fault access test points located on the close ratings ensure that the front of the unit make for quick 17 network protector will withstand test cable connections and avoid fault conditions and continue requiring the operator to reach to protect their associated into live voltage area. 18 transformer.

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For more information, visit: www.eaton.com/consultants CA08104001E Spot Network Equipment 18.0-23 May 2017 Network Protector Equipment Sheet 18023 Type CM52—Options and Standards and Certifications

16. Improved Submersible Enclosure Remote Racking System Design: Customer-Specified i Internal or External Fuse Mounting The CM52 network protector is also and revised Hinging and Opening available with an integral remote hardware for easier door opening racking system. The system remotely ii and closing. The door has greater racks the breaker off the energized than 90° opening capability. bus work while the door is still closed to the “test” position either through 1 an external pendant or through Options communications. 2 Arc Flash

Test Block Access Cover 3

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6 Remote Racking System 7 Standards and Certifications ■ Meets or exceeds the standards in 8 IEEE C57.12.44 ■ The CM52 network protector is UL labeled and approved in the NEMA 9 housing at all ratings 10 Seismic Qualification Test Block with Cover Removed 12. Universal Wired Breaker: Breakers 11 are wired all the same regardless of system voltage. Breakers can VaultGard™ Arcflash Reduction be interchanged between 216 V Maintenance System™ Indicating 12 grids and 480 V spots without Diagnostic Module modifications. Multi-Tap settings Refer to Ta b 1 for information on for current transformers make The CM52 network protector is available 13 with the NPARMs module (Arcflash seismic qualification for this and changing amperes easy for other Eaton products. maximum flexibility and Reduction Maintenance System). inventory reduction. This device is internal to the network 14 13. Retrofit Adapter Frames and protector and can be remotely activated Bus Adapters: Allows replacing of usually through a switch mounted at 15 most older GE and Westinghouse the vault entrance or through commu- breakers in existing enclosures. nications. This will enable the Arcflash Reduction Maintenance System device 14. Color Coded Teflon® Wire: on all CM52s in a spot network. Once 16 Red = Close Circuit activated, the NPARMs places the Green = Open Circuit protectors in a sensitive mode, sens- White = All Other ing both forward and reverse current 17 Yellow = Normally Open directions. This device will actuate in Blue = Normally Closed 3–4 ms and call for all CM52 breakers Black = Common to trip if a fault is sensed on an adjacent 18 network protector or collector bus. It 15. Sixty (60) Point Secondary Contact: has been shown that this device limits Allows quick wiring for additional the total incident energy to less than 19 contacts, relays and other devices 8 cal/cm2. in the breaker element. Connec- tions are automatic for breaker 20 racking in and out. 21

CA08104001E For more information, visit: www.eaton.com/consultants 18.0-24 Spot Network Equipment Network Protector Equipment May 2017 Sheet 18 024 NPL Fuse

NPL Fuse

i .5 .6 .7 .9.8 1243 56 10987 20 504030 60 70 80 90 100 200 300 400 500 600 700 800 900 1000 2000 3000 4000 5000 6000 7000 8000 9000 10,000 1000 1000 900 900 800 800 700 700 600 600 500 500 ii 400 400

300 300 1 2 3 4 5 1 200 200

100 100 90 90 80 80 70 70 2 60 60 50 50 40 40 3 30 30 20 20

10 10 4 9 9 8 8 7 7 6 6 5 5 5 4 4 NPL Fuse 3 3 2 2

6 Eaton’s NPL fuse has been designed as Scale x 10 = Seconds a nonexpulsion, silver-sand type fuse. 1 1 .9 .9 It is exclusively for use on the CM52 .8 .8 .7 .7 network protector. Each end terminal .6 .6 7 .5 .5 is fabricated from high conductivity, .4 .4

impact extruded copper. High quality .3 .3

NEMA Grade G5 convolutely wound .2 .2 8 glass melamine tubing is permanently sealed to the terminal with RTV .1 .1 .09 .09 SilasticT to eliminate possible sand .08 .08 9 .07 .07 leakage or moisture entry. The termi- .06 .06 .05 .05 nals and tube are secured together .04 .04 10 with stainless steel, high strength, .03 .03 spirally wound pins. All fuses are tested .02 .02 on an ultra-low resistance measuring instrument capable of resolving one- .01 .01 11 .7.5.6 .9.8 1243 56 10987 20 504030 60 80 70 90 100 200 300 400 500 600 700 800 900

hundredth of a micro-ohm and 1000 2000 3000 4000 5000 6000 7000 8000 9000 10,000 evaluated on the basis of statistical Scale x 1000 = Current in Amperes 12 probability techniques to ensure uniformity. Figure 18.0-19. Average Melting Curve of NPL Fuse

12 13 Characteristics of the NPL fuse have Table 18.0-7. CM52 Protector Limiter Selection been especially tailored for coordina- Protector Current Limiter/Fuse Curve 1 tion with the transformer safe-heating Rating (A) Style Number Number curve and in consideration of the 14 protector interrupting rating. This 800 140D318G04 1 specially designed characteristic curve 1200 140D318G05 2 1600–1875 140D318G01 3 is less inverse than the ordinary melt- 15 ing characteristic of a silver-sand fuse. 2000 140D318G07 — 2500–2825 140D318G02 4 The curve is a function of the design 3000 140D318G06 5 of the unique, silver element used in 3500 140D318G08 — 16 2 its make-up. 4000 5980C01G03 2 4500 KRPC6000 The NPL fuse does not become current- 1 17 limiting within the interrupting rating These are the recommended limiters for use on three and four transformer spot network systems. The limiters are optional on two transformer systems. of the protector. The fuses have been 2 successfully tested in its epoxy Consult Eaton for DSL fuse curve and Bussmann for KRPC fuse curved. 18 enclosure at a three-phase fault condition of 150,000 A at 600 V. The NPL fuse is not ampacity rated, 19 and does not provide overcurrent protection per NEC Article 240. 20 Fusing a protector is necessary for three- and four-spot network transformer spot networks, but not 21 two transformer spot networks.

For more information, visit: www.eaton.com/consultants CA08104001E Spot Network Equipment 18.0-25 May 2017 Network Protector Equipment Sheet 18025 Type MPCV Network Protector Relay

Warning Trip Function Description i The MPCV relays are designed to be Figure 18.0-20 diagrams the current- The microprocessor controlled network used on network protectors which induced trip characteristics. The relays were designed to replace the have been wired for 216Y/125 V or positive sequence current I1 is multi- Type CN-33 electromechanical master ii 480Y/277 V service using relay plied by the cosine of the angle of its relay, the Type CNJ electromechanical potential transformers. This relay phasor related to V1N. If the resulting phasing relay and the Type BN electro- is designed to operate at 125 V (line sign is negative, then reverse power- mechanical desensitizing relay. The 1 to ground). Do not attempt to apply flow is indicated. The trip level MPCV series relays use the same this relay on any other system voltage (11COSØ) for this can be adjusted from voltage and current inputs as do the or configuration. 0.05 to 5 percent of rated current. The electromechanical equivalent. They 2 cosine multiplication operation results |also continually monitor voltage across in the straight line which is an open breaker and current through perpendicular to the phasor. a closed breaker, and perform the 3 following functions. ■ The trip contact will close upon 4 balanced fault conditions if the positive sequence power flow is out of the network 5 ■ The close contact will close if the ensuing positive sequence power will be into the network 6 ■ The trip contact will close upon the flow of reverse magnetizing current of its associated transformer 7 The MPCV series relay will mount on standard CM52 and existing CMD and 8 CM-22 network protectors utilizing the present system of low-voltage relay mounting studs. 9 MPCV Network Relay Exclusive Features 10 The MPCV relay is the only sequenced- MPCV Relay (Front View) for CM52 Protectors based network relay in the market. Failure to follow these instructions 11 The MPCV relay calculates the could result in severe personal injury, fundamental frequency positive death, and/or product or property Figure 18.0-20. Trip Characteristics sequence voltage and current phasors damage. 12 to account mathematically for any In a different fault condition, the power system voltage unbalances. Functional Characteristics negative sequence network voltage Essentially, the MPCV relay extracts V2N will exceed 0.06 P.U., in which 13 the fundamental components of the All measurements in the relay are case the trip curve is rotated 60º sampled voltage and current signals made as net voltages and currents, clockwise direction to the alternate using discrete Fourier Transform, then computed as the positive sequence trip curve shown, with the same trip 14 the positive sequence components are voltage and current (represented as level as set before (0.05 to 5 percent). then calculated. The positive sequence V1X or I1) and the negative sequence In either case, the trip is called for after current phasors for each phase are voltage and current (represented as 50 mS, or three line cycles, in a 60 Hz 15 compared with the reverse trip V2X or I2). The network positive and system, of a fault condition. negative voltages sequence are setting (RT in the setting menu) and The BN function can be initialized to a determination to trip is made within denoted V1N and V2N respectively. 16 The other important voltage is the modify the characteristics and timing the relay. The sampling rate is 32 of the reverse-current trip conditions. samples per power line cycle, and phasing voltage, which is the differ- ence between the transformer and This adds to the basic detection the algorithm requires two successive requirements that the true rms value 17 line cycles of data to initiate a trip network voltages, whose sequence components are denoted V1P and V2P. of the reverse current exceeds some where the positive sequence currents settable threshold between 50% and experienced by the MPCV relay exceed The V1N is defined as the reference 250% of the protector CT rating. When 18 the RT settings. The MPCV has the phasor for all phase measurements, the magnitude of the reverse current is following exclusive features: and the nominal phase-to-neutral less than the settable threshold, a trip 19 ■ Gull-Wing Trip to address high X/R voltage (1 P.U.) is defined as 125 Vac will occur if the condition exists for Network Transformers rms. From this, the basic functional an adjustable time period of 0 to characteristics are graphically depicted 5 minutes. The BN function is standard ■ Anti-pump algorithm in Figures 18.0-20 through 18.0-23. on all MPCV relays. 20 ■ Protective remote close 21

CA08104001E For more information, visit: www.eaton.com/consultants 18.0-26 Spot Network Equipment Network Protector Equipment May 2017 Sheet 18 026 Type MPCV Network Protector Relay

Special Trip Characteristic— i “Gull-Wing” Trip 0º

For some applications, the straight- Non-Trip Region ii line trip curve is not the optimum VN performance setting to use. If the I transformers have high X/R ratios, then TYP. Forward 1 the straight-line trip does not perform as well as the enhanced “Gull-Wing” trip characteristic, a feature that has 2 been in the MPCV relay since 2003. 5º Tilt Technically, the following circumstances RT/Tan (5º) benefit from having the enhanced 90º 270º 3 “Gull-Wing” trip feature: RT IHigh_Lag ■ Under a three-phase fault with 4 the X/R ratio higher than 11.4, the voltage to current angle is less IBackfeed than 95 degrees 5 ■ Double line-ground faults on the primary of a delta-wye transformer with blown protector fuse on Trip Region 6 one phase 180º ■ Single line-ground fault on the primary of grounded wye-grounded Figure 18.0-21. Traditional Relay Trip Characteristic 7 wye transformer with blown protector fuse on one phase 0º 8 Close Characteristics Non-Trip Region Figure 18.0-24 also diagrams the VN 9 voltage regions for close, float and trip operation when the protector is open. ITYP. Forward Under extreme conditions when the 10 protector is open, a trip is called for to prevent a dangerous manual close Expanded 5º “Gull-Wing” operation. With the protector open and 5º Tilt 11 the network and transformer voltages Trip Region RT/Tan (5º) normal and balanced, positive sequence 90º 270º phasing voltage (V1P) is measured. RT 12 If V1P is in the close region, the relay IHigh_Lag makes its close contact. If V1P is not in the close region, but is less than 0.06 P.U., then the float is called for, as 13 IBackfeed this voltage difference is not deemed dangerous regardless of the phase 14 relationships, and manual close of the protector would not exceed the breaker Trip Region capacity. If V1P is greater than 0.06 P.U. 180º 15 and does not lie in the close region, then trip is called for to prevent manual Figure 18.0-22. Enhanced “Gull-Wing” Trip Characteristic closing. The relay also calls for trip 16 under all rolled and crossed phase Protective Remote Close (PRC) The PRC command is not an unqualified conditions, even when either the trans- close, rather the MPCV relay relaxes former side or the network side of the Feature its master line setting to 75 mV and 17 protector is de-energized. This feature helps address problems the command closes the protector The close contact will close only in with very lightly loaded network provided the phase voltage angle is protectors. If a protector is opened 18 the quadrant defined by the two lines, in the widen close window. After termed master and phasing. The phas- and the system is very lightly loaded, closure, the MPCV relay automatically ing line, emanating from 0, defines a the users had to manually close the readjusts the master line setting back protector that had opened. The MPCV 19 minimum phase angle of the phasing to the original master line setting voltage ahead of the network voltage can be sent a PRC communications configured in the relay. for closing, which is selectable at +5°, close command via any Eaton 20 –5°, –15° or –25°. The master line sets communication option available. a minimum difference between the transformer and network voltage, 21 settable from 0.0008 to 0.02 P.U. at 0° (in phase). This line exhibits a slope of 7.5°.

For more information, visit: www.eaton.com/consultants CA08104001E Spot Network Equipment 18.0-27 May 2017 Network Protector Equipment Sheet 18027 Communications Capabilities

If the network side is de-energized, and Factory default settings are programmed the transformer side is energized, the into each MPCV network relay, however, i close contact will close, if V1N is less each project and protector application than 0.1 P.U., and V2N is less than represents different voltage and loading 0.06 P.U., and V1P exceeds 0.8 P.U. Note conditions, which can require adjust- ii that, as stated before, if V2P exceeds ment of the default settings to other 0.2 P.U., then the trip contact will close, appropriate values. Experienced service indicating crossed phases on either the technicians must be used when com- 1 transformer side or the network side. missioning protectors, and proper tools such as protector test sets and program- Settings ming pendants must be used to start up 2 All settings can be altered through a protectors and maintain the units. digital programming pendant which Relay settings can also be implemented 3 plugs into the unit while mounted on via PowerNet software, which allows the network protector breaker. When for the full use of the communication not in use, the pendant may be stored features of the MPCV network relay 4 separate from any network protector as described on the following pages. location, most conveniently with the Non-Eaton communication protocols Figure 18.0-23. Circular Closing Curve network protector test kit. While the may be able to interface with a sub- 5 pendant is plugged in, actual trip and network of MPCV relays through a data Note: If the phases are crossed on both close operations will be inhibited and concentrator and an independently the transformer and the network side, V2P the amber float light will flash. The pen- written and supplied driver. 6 could be very close to or equal to zero, but dant has a display for the readout of the the trip contact will close as V1N is less than set points and a keyboard to set them. 0.1 P.U. and V1P is less than 0.8 P.U. The other closing curve characteristic 7 option available is the circular line 0º closing curve which maintains the Normal ML, Protective Remote Close (PRC) PL PL Re-close Settings same value of phasing volts from –25º 8 Straight Line Close Characteristic the –25° to +90° quadrants (refer to Figure 18.0-23). The circular closing PRC curve permits the network protector 9 to close at lower loads while ensuring Temporary (10 sec) Close Region PRC Boundary the watt flow is into the network. 10

Any close conditions must exist for VP 500 ms before the close contact ML will close. 11 VPX PRC ~75 mV 90º 270º 12 VN 13 180º

Figure 18.0-25. PRC—Straight Line Close 14

0º Nornal ML, PL1, 15 Protective Remote Close (PRC) PL1 PL2 Re-close Settings –25º Circle Close Characteristic

PRC 16

Temporary (10 sec) Close Region PRC Boundary 17

VP ML 18 PL2 Figure 18.0-24. Closing Characteristics— VPX Straight Closing PRC ~75 mV 90º 270º 19 VN 20

180º 21 Figure 18.0-26. PRC—Circle Close

CA08104001E For more information, visit: www.eaton.com/consultants 18.0-28 Spot Network Equipment Network Protector Equipment May 2017 Sheet 18 028 MPCV Network Relay Communications

Monitoring Control i Control and Monitoring Capabilities from MPCV Power Xpert provides energy manage- The MPCV network relay with ment, operations and equipment communications enabled, allows ii Network Relays status information, and offers the each network protector in a system to operator these capabilities: be controlled from a remote location Proven Power Xpert® software, and allows the following capabilities: developed by Eaton, provides an ■ Real-time information. The operator 1 operator with the capability to control commands an inquiry to each MPCV ■ Close or trip the breaker relay network protectors from a personal Relay on the system which logs contacts. If the operator chooses computer… while simultaneously current, voltage, power (watts, to have the breaker’s relay trip 2 monitoring power quality and operating vars and VA), energy, frequency, contact “make,” the breaker conditions, providing this information demand, power factor, and total opening can be viewed on-screen in real time. harmonic distortion (THD). This and listed currents will go to zero. A 3 information is displayed on a designed-in safety feature prevents Power Xpert is a Web-based informa- single screen the network protector from being tion gathering system that uses only closed while the MPCV Relay trip Ethernet browsers and IP addresses to Also displayed on this screen is 4 contact is “made” until the relay trip display data. No custom or proprietary network protector inside air temper- response is removed vendor software is required. ature. Additionally, from the same 5 screen, the operator can select to ■ Relay set points. The operator can view the last trip waveform or review or change the operational set review the MPCV Relay set points points without using the hand-held 6 ■ Data printout. Real-time information controlling pendant. Password from all MPCV Relays on any one protected security helps prevent feeder can be printed out to provide accidental or improper usage 7 a near instantaneous load flow of the entire feeder Alarming ■ Internal environment of the network Eaton software provides the operator 8 protector enclosure. Water inside with these capabilities: the network housing and upper ■ copper bus temperatures. Breaker Receive an alarm in real time. 9 status (open/closed) When an established parameter of a monitoring function is reached Sample Set Point Screen ■ Vault environment. Transformer or exceeded, an alarm condition is 10 top oil temperature, water in the displayed immediately on the PC network vault, fire alarm, and screen, enabling the operator to: network enclosure pressure ❑ Identify the vault or feeder in 11 question ❑ Determine what alarm has been 12 triggered and at what location ■ Power Xpert is a Web-based approach to communications 13 without proprietary vendor software ❑ For more information, visit the URLs below: 14 www.eaton.com/powerxpert www.eaton.com/pxm www.eaton.com/pxgx 15 Sample Monitoring Screen www.eaton.com/pxs www.eaton.com/pxr 16

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For more information, visit: www.eaton.com/consultants CA08104001E Spot Network Equipment 18.0-29 May 2017 Network Protector Equipment Sheet 18029 MPCV Network Relay Communications

Other Communication Protocols The server is simple to connect and DNP MINT Translator requires no software, only Internet i Eaton has introduced expanded Explorer. The system displays real communications options for the MPCV time voltage and current readings, relay, those being the VaultGard, and PF, watts, temperature, open/close ii the DNP MINT. status, relay set points and MPCV relay control-remote open and block open, VaultGard protective remote close (PRC). The 1 device can log up to 32 MPCV relay data and provide MPCV reason code outputs. 2 ■ No software needed!—wireless Wi-Fi or hardware Ethernet connection 3 ■ Object trending ■ Operations counter ■ Wireless control and calibration 4 color coded alarms DNP MINT Translator ■ E-mail notification (with cellular, 5 VaultGard hot spot or ethernet connection The DNP MINT allows connection of configuration) up to 16 devices, including MPCV This device server can display up to ■ relays, DT810 and DT910 trip units, 32 MPCV relays on one screen. The Automatically discovers connected 6 MPCVs DT OPTIM, DT 520MC, DT1150, DT3000, protocol is Ethernet and/or DNP 3.0. DTMV, DT3200, DP-4000, DIM digital ■ Reason code display Devices can be connected in various input module, and addressable relays. 7 communication configurations, such as ■ No new relay to purchase The output is DNP3.0 in RS-485. hardwired LAN or wireless, including ■ 128 bit security short-range wireless from module The DNP MINT can be configured ■ Data logging (100 m), cellular modem and hot spot either hardwired, fiber optic, 900 MHz 8 zone connect ability. ■ DNP 3.0, up and down link radio, or cellular. ■ DNP 3.0 RS-485 ■ Up to 16 MPCVs or other devices ■ DNP 3.0 over Ethernet 9 can be connected to one module ■ RS-485 uplink allows networking multiple DNP MINTs 10 ■ Toggle switch controlled configuration mode 11 ■ Class 0 polling and Class 1, 2, 3 events supported ■ Direct operate or select and operate 12 remote control ■ Can be hardwired or wirelessly viewed 13 ■ Simple twisted pair to MPCVs can be run up to 10,000 feet 14

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CA08104001E For more information, visit: www.eaton.com/consultants 18.0-30 Spot Network Equipment Network Protector Equipment May 2017 Sheet 18 030 Communications Configurations

i Antenna ii

1 Serial DNP

2 Multiple MPCVs!

Cellular 3 DNP-RTM

4

5

6

Power Supply 7 120 Vac 120 Vac–12/48 Vdc

8

9 Communications Enclosure

10 Figure 18.0-27. Configuration #1—Cellular with DNP

11

PC 12 Laptop or Pocket PC

13 Fiber or 14 Wireless RF or Twisted Pair INCOM Cable Ethernet 15 or Cellular 16

17 VaultGard

18 MPCV MPCV MPCV MPCV

Network Network Network Network 19 Protector 1 Protector 2 Protector 3 Protector 4

Figure 18.0-28. Configuration #2—Wireless Sites/Digital Communication Links 20

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For more information, visit: www.eaton.com/consultants CA08104001E Spot Network Equipment 18.0-31 May 2017 Network Protector Equipment Sheet 18031 CM52 Protector Schematic

To Sec. Disc i 50 51 TB-14 TB-15 A-10 A-11 Connector on Relay

50 51 52b 52 a 52 b TS 30A AUXb AUX a AUX b B-14 N1 N41 ii 6 98 8 B-15 A-9 N11 M 97 7 TB-28 Network 30A A P 6 J2-5 N2 N42 18 5 TB-27 øA øB øC C 4 J2-4 3 TB-26 S V 2 J2-3 1 1 J2-1 30A N3 N43 TB-25 13 N1 A-1 S N2 A-2 A-3 N3 S A-12 A-13 B-7 B-8 N13 G 2 A A N12 A-14 J2-1 J2-2 J2-3 J2-4 J2-5 TA (-) Common Close Motor Coil TA J1-4

J1-8 Enabled OK OK OK X1 L1 TA TA0 (+)

J1-1 3

IDM J1-5

X2 L2 125 Vac T1A J1-6 J1-7 J2-9J1-2 J2-8 3-ø CLF CPT T1 H1 DO Power TR1 CL1

4A X3 50 Vac 52a 52b Circuit Breaker CL2 4 1 TS G1

Trip Input 52a 1C A-4 11C BF2

8 Motor Monitor TR2 Close Output Lockout M X4 L3 50 Vac 7 CL3 2C A-5 12C Close Coil Monitor 15 CLF P T3 H3 B-12 3-CT 3C A-6 13C C 11 4A X5 5 B-11 A-7 V T3C EL 0C 5 CL10 TB-1 2 5 43 B-3 MPCV Remote T3 Trip Auto TS 30A 1 Trip 7 T2 B-2 T1 T41 6 7 TB-2 CL4 2 T1 B-1 T11 9 43 A BF1 M 11 Close 4 30A P L1 BF2 T2 T42 B-13 17 C 1 MPCV CL5 S 120 Vac Close 7 V 3 LS1 30A A-8 Transformer T3 T43 S 12 CL7 CL9 LS1 LS2 Customer Auxiliary BF1 S M1 CL6 Breaker Contacts T13 G 8 A A-15 A T12 MOT CL 52 a 52 b 52 a 52 b 52 a 52 b AUX a AUX b AUX a AUX b AUX a AUX b B-9 D1a D1b D1c D2a D2b D2c D3a D3b D3c G1 B-4 B-5 B-6 B-28 B-29 B-30 A-28 A-29 A-30 9

TB-16 TB-17 TB-18 TB-19 TB-20 TB-21 TB-22 TB-23 TB-24

Notes: 10 Legend: 1. Trip and Lockout Provisions: for remote trip, wire external N.O. BF-2 = Anti-Close/Lockout Relay TA = Trip Actuator contact to position 2 block and position 1 block. CL = Close Coil/Spring Release 43 = Ext. handle Switch 2. For customer remote monitoring, external indicating device TS = Test Switch 52a = BKR Aux(Open When Breaker Is Open) must not exceed 24 Vac/dc 10–20 MA. 11 LS1 = Motor Cutoff Switch 52b = BKR AUX(Closed When Breaker Is Open) MOT = Motor 120 Vac BF-1 = Close Relay MPCV = Network Relay LS2 = Timing Limit Switch Electrical interlock manufactured after September of 2003. IDM = Indicating Diagnostic Module EL = Electrical Interlock See Note 2 N.C. Dry Contacts for Monitoring. 12

Figure 18.0-29. Typical Schematic Diagram—CM52 Network Protector 480Y/277 V 13

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CA08104001E For more information, visit: www.eaton.com/consultants 18.0-32 Spot Network Equipment Network Protector Equipment May 2017 Sheet 18 032 Network Disconnect Cabinet

Network Disconnect Cabinet load-break designs. The protector, Eaton designs, manufactures and tests i not the disconnect, is always used the non-load-break disconnects at the to break and make load current. The same factory that makes the network mechanism is behind electrically protectors, and the plant is ISO 9000 ii interlocked cabinet doors, which when certified. Product electrical and dimen- opened, trips open the protector. sional coordination is ensured between Common ratings are 800–4000 A, the protectors and network disconnects 1 600 Vac and below. with Eaton. Due to the mounting location, the network disconnects are seated The cabinet designs are NEMA 1 indoor at high distances from the floor and 2 only. The protector has a flange at the sufficient vertical space must exist in top which allows for the mounting the electrical room to accommodate of the disconnect at the top of each the non-load-break product. 3 respective protector. In many cases, it is possible to locate current transformers The load conductor cables or busway within the network disconnect cabinet are connected at the top of each network 4 to provide for forward 50/51 protection disconnect. The drawings detailed on (relays mounted remotely) on the this page depict a busway flange and network circuits. These relays serve to connection. When busway is used, 5 monitor the circuit and trip the network only two flange orientations are Typical Network Disconnect— protector when faults occur within the preferred and those align the busway Neutral Connection Visible power circuit feeding the downstream phase conductors with the A, B, C left 6 spot network switchgear. to right orientation of the protector phase conductors. In some cases, it is possible to locate 7 the protector fuses within the cabinet.

Pow-R-Way Busway 8 (Flange Gasket Supplied by Busway) See Busway Drawing

Four Lifting/ 9 Drop Brackets Welded to Each Corner of Main Module 10 Hinged Exterior Doors Typical Network Disconnect— Cover Latch 11 with Doors Open Padlock Provision on Hinged Network disconnects are an important Exterior Covers safety item for spot network systems. 12 Many forms of disconnect are available, Removable Cover on Fuse Housing including downstream main breakers 13 and non-load-break disconnects at the 1.75 (44.5) D top of the network protector. This page Lift Hole describes the non-load-break product. CL

14 Network disconnect means on the load- Roll Out CL side of each protector is necessary to Unit allow safe access to the protector and C 15 L Network protector fuses in the circuit. These Trans. Extension Protector fuses are on the load-side of the Throat Rail protector and are still energized from 16 the downstream network when a given Stored protector is opened. Safe access to the Location of Track fuses requires some form of network Ext. 17 Inspection disconnect means, as outlined above. Window Eaton recommends the use of a In. Pipe Plug (2) 18 network disconnect means for each Side View Front View protector on all spot network systems. The choice is up to the owner or Figure 18.0-30. Typical 3000 A Non-Load-Break Disconnect Mounted on a Network Protector 1 19 designer based upon costs and 0.50 All-thread rod must be used for hanging as permanent support from overhead. 2 available space. The non-load-break Disconnect enclosure cabinet: interior and exterior surfaces receive “ANSI-61 Cationic Epoxy product from Eaton is a hook-stick, Electrocoat” grey finish over phosphatized 12 gauge steel. The interior of main module is then finished gloss white. 20 gang operated mechanism. The non- 3 Three-point cover latching mechanism between the two hinged front covers. load-break design allows for easier 4 Open-Close operations from the floor Dimensions for the neutral connection from disconnect cabinet to X/O on transformer must be supplied by contractor. 21 5 at the front of the unit compared to Current transformers mounted inside cubicle. CT ratio and class per customer’s specifications.

For more information, visit: www.eaton.com/consultants CA08104001E Spot Network Equipment 18.0-33 May 2017 Network Protector Equipment Sheet 18033 Network Transition Box

Network Transition Box The transition box designs are NEMA 1 Eaton designs, manufactures and tests indoor and NEMA 3R outdoor only. transition boxes the same factory that i Network transition boxes are used at The protector has a flange at the makes the network protectors, and the top of protectors when the network top which allows for the mounting of the plant is ISO 9000 certified. Product disconnect takes a form other than the the transition box at the top of each electrical and dimensional coordination ii non-load-break disconnect explained respective protector. In many cases it is is ensured between the protectors and on the previous page. This page possible to locate current transformers transition boxes with Eaton. describes the transition box product. within the network transition to provide 1 for forward 50/51 protection (relays The load conductor cables or busway Network disconnect means on the mounted remotely) on the network are connected at the top of each transi- load-side of each protector is neces- circuits. These relays serve to monitor tion box. The drawings detailed on this 2 sary to allow safe access to the protec- the circuit and trip the network protector page depict a busway flange and con- tor and protector fuses in the circuit. when faults occur within the power nection. When busway is used, several These fuses are on the load-side of the circuit feeding the downstream spot flange orientations are preferred and 3 protector and are still energized from network switchgear. those align the busway phase conductors the downstream network when a given with the A, B, C left to right orientation protector is opened. Safe access to the of the protector phase conductors. 4 fuses requires some form of network disconnect means, as outlined above. Eaton 5 Eaton recommends the use of a Bus Flange network disconnect means for each protector on all spot network systems. 6 The decision to use a main breaker or Bolt-on implies that the protector circuit does Front Cover not use the non-load-break disconnect, Removable NPL Type 7 perhaps due to the lack of space at the Fuse Housing Current Silver Cover Transformer top of the protector. The downstream Sand disconnect is usually key interlocked Fuses Removable 8 with the network protector. The area at Front Cover the top of the protector becomes a 1.75 (44.5) D transition area to connect to cables or Lift Hole 9 busway. Common ratings for transi- C Roll Out Unit L tion boxes are 800–4000 A, 600 Vac Network and below. CL Protector 10 Trans. Extension Throat Rail Stored 11 Location of Track Ext. Inspection 12 Window

1.00 (25.4) In. Pipe Plug (2) 13 Side View Front View 14

Figure 18.0-31. Typical 1875 A Network Transition Box Mounted on a Network Protector 15

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CA08104001E For more information, visit: www.eaton.com/consultants 18.0-34 Spot Network Equipment Rating Selection May 2017 Sheet 18 034 Spot Network Equipment Selector Guide

Spot Network Equipment i TX1 TX2 TX3 TX4 Selector Guide ii Figure 18.0-32 illustrates the general configuration of the network equipment NP1 NP2 NP3 NP4 for Tables 18.0-9 through 18.0-12 Tie Tie Tie 1 equipment values. For three-unit spot networks, the fourth transformer/pro- tector pair and load L4 bus and load do not exist. For 2-unit spot networks, the LOADS LOADS LOADS LOADS 2 L1 L2 L3 L4 third and fourth transformer/protector pairs and load L3 and L4 buses TL = L1 + L2 + L3 + L4 = Total Network Load kVA and loads do not exist. Tables 18.0-9 3 Figure 18.0-32. Spot Network Configurations—Partial One-Line 3 through 18.0-12 are developed for 3 systems anticipating only one primary For details on metal-enclosed switchgear, see Section 20. 4 feeder outage, and secondary voltage Table 18.0-9. Spot Network Equipment Ratings for Liquid Transformers— is 480 wye or 208 wye respectively. 480 V Secondaries Liquid Transformers (Including Oil and Silicone) OA 55 °C Rise with 138% Short Time Capacity (Up to 24 Hours for Probable Sacrifice of 1% Life) For example, if a facility had a demand 5 load of 4400 kVA and three primary Total Network TL = Load kVA TX = Network TX NP = Protector LV Switchgear Tie services that could be networked using TX kVA Nominal (Maximum for kVA (55°C Liquid) Ampacity Breaker Frame/ One PRI Outage) at 480 V Tri p A m p e re s dry-type network transformers, then 6 secondary protectors, secondary con- Two-Unit Spot Network TL = L1+L2 and L3 = L4 = 0—TX3 and TX4 are Absent ductors and three 480 Vac switchgear 1000 690 500 1200 800/800AT 1500 1035 750 1600 1600/1200AT busses with three mains, two ties and 2000 1380 1000 1875 1600/1600AT 7 distributed feeder breakers could be 3000 2070 1500 2500 3200/2200AT used in spot network systems. 4000 2760 2000 3500 4000/3200AT 8 We look at the first column until we find 5000 3450 2500 4500 4000/4000AT the kVA of load required, which is found Three-Unit Spot Network TL = L1+L2+L3 and L4 = 0—TX4 is Absent in the row that lists 4500 kVA. We note 1500 1380 500 1200 800/800AT 9 that the suggested size for each of the 2250 2070 750 1600 1600/1200AT 3000 2760 1000 1875 1600/1600AT transformers is 1500 kVA and the protector ampacity is 2500 A, and the 4500 4140 1500 2500 3200/2200AT 6000 5520 2000 3500 4000/3200AT 10 switchgear bus can be 3200 A using ties 7500 6900 2500 4500 4000/4000AT tripped at 2600 A. Using these compo- Four-Unit Spot Network TL = L1+L2+L3+L4—All TXs are Present nent values allows us to support up to 11 2000 2070 500 1200 800/800AT 4500 kVA (second column) for a short 3000 3105 750 1600 1600/1200AT period of time without significant loss 4000 4140 1000 1875 1600/1600AT of equipment life even when one 6000 6210 1500 2500 3200/2200AT 12 primary is unavailable. 8000 8280 2000 3500 4000/3200AT 10000 10350 2500 4500 4000/4000AT Table 18.0-8. CM52 Protector Features 1 13 Features CM52 Table 18.0-10. Spot Network Equipment Ratings for Dry Transformers— 480 V Secondaries Dry-Type Transformers (Including VPI, VPE and Cast Coil) AA/FA 80 °C Rise Continuous current 800–4500 A with 150% Overload Capacity (Continuous when Fan Cooling is Active and Ambient is 30 °C) ratings in amperes 14 Total Network TL = Load kVA TX = Network TX NP = Protector LV Switchgear Tie Operating mechanism Spring close TX kVA Nominal (Maximum for kVA (80 °C Dry) Ampacity Breaker Frame/ Close and latch Yes One PRI Outage) at 480 V Tri p A m p e re s 15 rating available Two-Unit Spot Network TL = L1+L2 and L3 = L4 = 0—TX3 and TX4 are Absent Mechanism withdrawal Drawout 1000 750 500 1200 1600/1000AT Mechanical life (no. ops) 10,000 1500 1125 750 1600 1600/1400AT 2000 1500 1000 1875 2000/1600AT 16 Withdrawn construction Deadfront 3000 2250 1500 2825 3200/2600AT Protector fuse type Silver- sand 4000 3000 2000 3500 4000/3200AT NPL type 5000 3750 2500 4500 4000/4000AT 17 2 Fuse location External Three-Unit Spot Network TL = L1+L2+L3 and L4 = 0—TX4 is Absent Protector trip device Shunt trip 1500 1500 500 1200 1600/1000AT Dielectric test passed 2200 V 2250 2250 750 1600 1600/1400AT 18 3000 3000 1000 1875 2000/1600AT UL label Yes 4500 4500 1500 2500 3200/2600AT 1 Strongly recommended for spot network 6000 6000 2000 3500 4000/3200AT 19 applications. Used optional pre-charge 7500 7500 2500 4500 4000/4000AT energy mechanism on two transformer Four-Unit Spot Network TL = L1+L2+L3+L4—All TXs are Present spot networks. 2 2000 2250 500 1200 1600/1000AT NPL fuses can be mounted in epoxy 20 3000 3375 750 1600 1600/1400AT enclosures or network disconnect cabinets. 4000 4500 1000 1875 2000/1600AT 6000 6750 1500 2500 3200/2600AT 21 8000 9000 2000 3500 4000/3200AT 10000 11250 2500 4500 4000/4000AT

For more information, visit: www.eaton.com/consultants CA08104001E Spot Network Equipment 18.0-35 May 2017 Rating Selection Sheet 18035 Spot Network Equipment Selector Guide

Table 18.0-11. Spot Network Equipment Ratings for Liquid Transformers—216Y or 208Y Secondaries Liquid Transformers (Including Oil and Silicone) OA 55 °C Rise with 138% Short Time Capacity (Up to 24 Hours for Probable Sacrifice of 1% Life) i Total Network TL = Load kVA (Maximum TX = Network TX kVA NP = Protector LV Switchgear Tie Breaker TX kVA Nominal for One PRI Outage) (55 °C Liquid) Ampacity at 216 or 208 V Frame/Trip Amperes Two-Unit Spot Network TL = L1+L2 and L3 = L4 = 0—TX3 and TX4 are Absent ii 1000 690 500 2000 2000/1900AT 1500 1035 750 3000 3200/2800AT 2000 1380 1000 4500 4000/4000AT 1 1 3000 2070 1500 5000/5000AT 4000 2760 2000 N/A N/A 5000 3450 2500 N/A N/A 2 Three-Unit Spot Network TL = L1+L2+L3 and L4 = 0—TX4 is Absent 1500 1380 500 2000 2000/1900AT 2250 2070 750 3000 3200/2800AT 3 3000 2760 1000 4500 4000/4000AT 1 4500 4140 1500 5000/5000AT 6000 5520 2000 N/A N/A 4 7500 6900 2500 N/A N/A Four-Unit Spot Network TL = L1+L2+L3+L4—All TXs are Present 2000 2070 500 2000 2000/1900AT 5 3000 3105 750 3000 3200/2800AT 4000 4140 1000 4500 4000/4000AT 1 6000 6210 1500 5000/5000AT 6 8000 8280 2000 N/A N/A 10000 10350 2500 N/A N/A 1 For the listed table Total Load values (TL) protector ratings are not available. However, protector ratings are available through 5000 A, which will 7 support reduced TL (Total Load) values of 1871 kVA, 3742 kVA and 5613 kVA for 2-, 3-, and 4-unit spot networks, respectively at 216Y volt secondary (4% less load values are supported if 208Y is the system voltage). Note: NA indicates that spot networks are not available. 8 Table 18.0-12. Spot Network Equipment Ratings for Dry Transformers—216Y or 208Y Secondaries Dry Transformers (Including VPI, VPE and Cast Coil) AA/FA 80 °C Rise with 150% Overload Capacity (Continuous when Fan Cooling is Active and Ambient is 30 °C) 9 Total Network TL = Load kVA (Maximum TX = Network TX kVA NP = Protector LV Switchgear Tie Breaker TX kVA Nominal for One PRI Outage) (80°C Dry) Ampacity at 216 or 208 V Frame/Trip Amperes Two-Unit Spot Network TL = L1+L2 and L3 = L4 = 0—TX3 and TX4 are Absent 10 1000 750 500 2250 2000/1900AT 1500 1125 750 3500 3200/3100AT 2000 1500 1000 4500 4000/4000AT 11 2 3000 2250 1500 5000/5000AT 4000 3000 2000 N/A N/A 5000 3750 2500 N/A N/A 12 Three-Unit Spot Network TL = L1+L2+L3 and L4 = 0—TX4 is Absent 1500 1500 500 2250 2000/1900AT 2250 2250 750 3500 3200/3100AT 13 3000 3000 1000 4500 4000/4000AT 2 4500 4500 1500 5000/5000AT 6000 6000 2000 N/A N/A 14 7500 7500 2500 N/A N/A Four-Unit Spot Network TL = L1+L2+L3+L4—All TXs are Present 2000 2070 500 2250 2000/1900AT 15 3000 3105 750 3500 3200/3100AT 4000 4140 1000 4500 4000/4000AT 2 6000 6210 1500 5000/5000AT 16 8000 8280 2000 N/A N/A 10000 10350 2500 N/A N/A 2 For the listed table Total Load values (TL) protector ratings are not available. However, protector ratings are available through 5000 A, which will 17 support reduced TL (Total Load) values of 1871 kVA, 3742 kVA and 5613 kVA for 2-, 3-, and 4-unit spot networks, respectively at 216Y volt secondary (4% less load values are supported if 208Y is the system voltage). Note: NA indicates that spot networks are not available. 18

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CA08104001E For more information, visit: www.eaton.com/consultants 18.0-36 Spot Network Equipment Rating Selection May 2017 Sheet 18 036 Protector Application Information

i Protector Application Information Table 18.0-13. Transformer and Protector Combinations and Protector Ratings—CM52 Protectors ii Network Transformer Network Protectors Tra n s f o rm e r Full Load Current Continuous Protector Rating Interrupting Rating in Close and Latch Rating Nameplate rms Amperes Current Rating as % of Transformer rms Symmetrical in rms Symmetrical 12 kVA Rating rms Amperes Full Load Current Amperes Amperes 1 System Voltage = 216Y/125 or 208Y/120 225 600 800 133 42,000 35,000 300 800 1200 150 42,000 35,000 2 500 1333 1600 120 42,000 35,000 500 1333 1875 141 42,000 35,000 500 1333 2000 150 42,000 35,000 3 500 1333 2250 169 65,000 45,000 750 2000 2500 125 65,000 45,000 750 2000 2825 141 65,000 45,000 4 1000 2667 3000 112 65,000 45,000 1000 2667 3500 131 85,000 65,000 1000 2667 4500 169 85,000 65,000 5 System Voltage = 480Y/277 500 600 800 133 42,000 35,000 750 900 1200 133 42,000 35,000 6 1000 1200 1600 133 42,000 35,000 1000 1200 1875 158 42,000 35,000 1000 1200 2000 167 42,000 35,000 7 1000 1200 2250 188 65,000 45,000 1500 1800 2500 139 65,000 45,000 1500 1800 2825 157 65,000 45,000 8 2000 2400 3000 125 65,000 45,000 2000 2400 3500 145 85,000 65,000 2500 3000 4500 150 85,000 65,000 9 2500 3000 5000 167 85,000 65,000 1 The interrupting rating exceeds the available fault current from the transformer. 2 The short time rating of protectors without fuses equals the interrupting rating. 10 Note: Use this table and its equipment ratings when designing network systems where the protectors are rated lower or higher, as a percentage of the full load amperes of the transformers, than those selected in the Tables 18.0-9 through 18.0-12. This table is also useful when selecting equipment ratings for systems that anticipate more than one single primary outage, e.g., when two outages are expected 11 on a four-transformer spot network.

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For more information, visit: www.eaton.com/consultants CA08104001E Spot Network Equipment 18.0-37 May 2017 Layout Dimensions Sheet 18037 Liquid-Type Network Unit Dimensions

Dimensions i

Neutral Legend: ii SW = Primary TX = Network Transformer (Silicone filled) NP = Network Protector ND 12 ND = Network Disconnect (Non-load-break) (304.8) 1 W All dimensions are shown in Tables 18.0-14 18 and 18.0-15. (457.2) WT WP Front H 2 ND HT SW DD Liquid 32 SW Transformer HN 3 (812.0) TX NP DN HP HL D NP TX 4

Plan View Front View 5 Figure 18.0-33. Liquid Network Unit Dimensions and Weights, Indoor Design Note: Dimensions are approximate for silicone filled network transformers and are typical for the ratings indicated. Designs can be customized to fit into existing spaces in many instances, although at higher cost. Specifiers are encouraged to consult Eaton to facilitate special existing 6 conditions.

Table 18.0-14. Liquid Network—Dimensions in Inches (mm) 7 Network Dimensions—Refer to Plan and Front View Figures Above Equipment 1 TX NP HT HP HL HN H WT WP W DN DD D 8 kVA Amps 500 1200 64 (1625.6) 49 (1244.6) 40 (1016.0) 52 (1320.8) 106 (2692.4) 50 (1270.0) 34 (863.6) 102 (2590.8) 32 (812.8) 34 (863.6) 42 (1066.8) 9 750 1600 67 (1701.8) 50 (1270.0) 43 (1092.2) 55 (1397.0) 109 (2768.6) 53 (1346.2) 34 (863.6) 105 (2667.0) 32 (812.8) 34 (863.6) 45 (1143.0) 1000 1875 77 (1955.8) 54 (1371.6) 54 (1371.6) 66 (1676.4) 120 (3048.0) 56 (1422.4) 34 (863.6) 108 (2743.2) 32 (812.8) 34 (863.6) 48 (1219.2) 1500 2500 83 (2108.2) 57 (1447.8) 55 (1397.0) 69 (1752.6) 123 (3124.2) 62 (1574.8) 36 (914.4) 116 (2946.4) 38 (965.2) 34 (863.6) 55 (1397.0) 2 2 2000 3500 90 (2286.0) 61 (1549.4) 65 (1651.0) 74 (1879.6) 66 (1676.4) 38 (965.2) 122 (3098.8) 38 (965.2) 63 (1600.2) 10 2 2 2500 4500 93 (2362.2) 63 (1600.2) 67 (1701.8) 90 (2286.0) 68 (1727.2) 42 (1066.8) 128 (3251.2) 48 (1219.2) 68 (1727.2) 1 Protector selected at 480 V per Ta b l e 18 . 0 - 9 recommendations. 2 Consult Eaton for network disconnect information. If disconnect is remote from this location, then the transition box at top of protector is 11 30.00–36.00 inches (762.0–914.4 mm) above protector flange.

Table 18.0-15. Liquid Network—Weights in Lb (kg) 12 Network Weights in Liquid Gallons Equipment Lb (kg) (Liters) 3 4 13 TX NP Network TX Protector NP Network Disconnect Network TX kVA Amps 500 1200 7800 (3541) 850 (386) 250 (114) 220 (833) 14 750 1600 10,600 (4812) 850 (386) 300 (136) 250 (946) 1000 1875 11,400 (5176) 850 (386) 350 (159) 320 (1211) 1500 2500 16,100 (7309) 1200 (545) 400 (182) 500 (1893) 5 15 2000 3500 21,000 (9534) 1450 (658) 600 (2271) 5 2500 4500 24,000 (10,896) 1500 (681) 700 (2650) 3 Weights for transformers include the fluid weight. 4 16 The number of gallons of liquid includes the fluid inside the primary switch. 5 Consult Eaton for network disconnect information. If disconnect is remote from this location, then the transition box at top of protector is 30.00–36.00 inches (762.0–914.4 mm) above protector flange. 17

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CA08104001E For more information, visit: www.eaton.com/consultants 18.0-38 Spot Network Equipment Layout Dimensions May 2017 Sheet 18 038 Dry-Type Network Unit Dimensions

i Legend: Neutral SW = Primary 20 TX = Network Transformer (Silicone filled) (508.0) NP = Network Protector ii ND = Network Disconnect (Non-load-break) ND 12 (304.8) W

36 WT WP Front 1 (914.4) Dry Type Transformer H Dry Type ND 2 Transformer HP HT Front SW TX HN SW TX NP HL NP DN 3 D DD

Front Plan View Front View 4 18 (457.2)

Figure 18.0-34. Dry-Type Network Unit Dimensions and Weights, Indoor Design 5 Note: Dimensions and weights are for standard VPI or VPE Dry-Type designs, 80 °C rise with fans with 150% continuous overload capacity and aluminum windings. Copper windings add more weight. Primary voltage is 15 kV, 95 kV BIL insulation. 6 Table 18.0-16. Dry-Type Network—Dimensions in Inches (mm) Network Dimensions—Refer to Plan and Front View Figures Above Equipment 1 2 7 TX NP HT HP HL HN H WT WP W DN DD D kVA Amps

500 1200 90 (2286.0) 90 (2286.0) 56 (1422.4) 69 (1752.6) 123 (3124.2) 90 (2286.0) 34 (863.6) 180 (4572.0) 32 (812.8) 34 (863.6) 66 (1676.4) 8 750 1600 90 (2286.0) 90 (2286.0) 56 (1422.4) 69 (1752.6) 123 (3124.2) 102 (2590.8) 34 (863.6) 192 (4876.0) 32 (812.8) 34 (863.6) 66 (1676.4) 1000 1875 102 (2590.8) 90 (2286.0) 56 (1422.4) 69 (1752.6) 123 (3124.2) 102 (2590.8) 34 (863.6) 192 (4876.0) 32 (812.8) 34 (863.6) 66 (1676.4) 1500 2500 102 (2590.8) 90 (2286.0) 60 (1524.0) 75 (1905.0) 129 (3276.6) 102 (2590.8) 36 (914.4) 194 (4927.6) 38 (965.2) 34 (863.6) 66 (1676.4) 3 3 9 2000 3500 112 (2844.8) 90 (2286.0) 64 (1625.6) 81 (2057.4) 124 (3149.6) 38 (965.2) 218 (5537.2) 38 (965.2) 66 (1676.4) 3 3 2500 4500 120 (3048.0) 90 (2286.0) 66 (1676.4) 90 (2286.0) 130 (3302.0) 42 (1066.8) 226 (5740.4) 48 (1219.2) 66 (1676.4) 1 Protector selected at 480 V per Table 18.0-10 recommendations. 2 10 Dimensions for overall width include a bussed transition—20.00 inches (508.0 mm) on the primary. This 20.00-inch (508.0 mm) section may be eliminated by using cable connections to primary bushing in lieu of buswork. 3 Consult Eaton for network disconnect information. If disconnect is remote from this location, then the transition box at top of protector is 11 30.00–36.00 inches (762.0–914.4 mm) above protector flange.

Table 18.0-17. Dry-Type Network—Weights in Lb (kg) 12 Network Weights in Equipment Lb (kg) 4 5 TX NP Primary SW + Fuses Network TX Protector NP + Stand Network ND Disconnect 13 kVA Amps

500 1200 2000 (908) 5600 (2542) 950 (431) 250 (114) 750 1600 2000 (908) 6700 (3042) 950 (431) 300 (136) 14 1000 1875 2000 (908) 8450 (3836) 950 (431) 350 (159) 1500 2500 2000 (908) 10,150 (4608) 1330 (604) 400 (182) 6 2000 3500 2000 (908) 13,150 (5970) 1550 (704) 6 15 2500 4500 2000 (908) 16,000 (7264) 1600 (726) 4 Dimensions and weights are for standard VPI or VPE Dry-Type designs, 80 °C rise with fans with 150% continuous overload capacity and aluminum windings. Copper windings add more weight. Primary voltage is 15 kV, 95 kV BIL insulation. 5 16 Protector stand carries the weight of the protector, because the dry-type end sheets do not have the strength to support the weight of the protector. 6 Consult Eaton for network disconnect information. If disconnect is remote from this location then the transition box at top of protector is 17 30.00–36.00 inches (762.0–914.4 mm) above protector flange.

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For more information, visit: www.eaton.com/consultants CA08104001E Spot Network Equipment 18.0-39 May 2017 Layout Dimensions Sheet 18039 Dry-Type Network Unit—Switchgear Mounted Protector Dimensions

Legend: i SW = Primary TX = Network Transformer (Silicone filled) NP = Network Protector ND = Network Disconnect (Non-load-break) ii W 36 44 WT (914.4) (1118) 1 Low- Dry-Type Dry-Type Voltage Transformer Switchgear Transformer Switchgear HT H 3 HP Mounted 2 DP D TX HN NP SW NP SW (1) TX 1 1 2 2 To 3 Switchgear PlanPlan View View Front Front View 4

Figure 18.0-35. Dry-Type Network Unit Dimensions and Weights, Indoor Design with Switchgear Mounted Protector Note: Dimensions and weights are for standard VPI or VPE Dry-Type designs, 80 °C rise with fans with 150% continuous overload capacity 5 and aluminum windings. Copper windings add more weight. Primary voltage is 15 kV, 95 kV BIL insulation.

Table 18.0-18. Dry-Type with Switchgear Mounted Protector—Dimensions in Inches (mm) 6 Network Dimensions—Refer to Plan Equipment and Front View Figures Above 1 2 3 TX NP HT HP HN H WT W DP D 7 kVA Amps 500 1200 90 (2286.0) 90 (2286.0) 96 (2438.4) 90 (2286.0) 102 (2590.8) 208 (5283.2) 66 (1676.4) 78 (1981.2) 8 750 1600 90 (2286.0) 90 (2286.0) 96 (2438.4) 90 (2286.0) 102 (2590.8) 208 (5283.2) 66 (1676.4) 78 (1981.2) 1000 1875 102 (2590.8) 90 (2286.0) 96 (2438.4) 102 (2590.8) 102 (2590.8) 208 (5283.2) 66 (1676.4) 78 (1981.2) 1500 2500 102 (2590.8) 90 (2286.0) 96 (2438.4) 102 (2590.8) 112 (2844.8) 218 (5537.2) 66 (1676.4) 78 (1981.2) 9 2000 3500 112 (2844.8) 90 (2286.0) 96 (2438.4) 112 (2844.8) 112 (2844.8) 218 (5537.2) 66 (1676.4) 78 (1981.2) 2500 4500 112 (2844.8) 90 (2286.0) 96 (2438.4) 112 (2844.8) 112 (2844.8) 218 (5537.2) 66 (1676.4) 84 (2133.6) 1 Protector selected at 480 V per Ta b l e 18 . 0 - 10 recommendations. 2 10 Primary switches shown are narrow design for three positions. 3 Dimensions are approximate for low-voltage switchgear construction. Close-coupling to switchgear structures with main and feeders will require 72.00–78.00 inch (1828.8–1981.2 mm) depth depending upon the type of feeders used, fused or nonfused. When switchgear is remote, using cable or busway connections, the depth of the protector section can be reduced to 72.00 inches (1828.8 mm). 11

Table 18.0-19. Dry-Type with Switchgear Mounted Protector—Weights in Lb (kg) Network Weight in 12 Equipment Lb (kg) TX NP Primary SW Network Transformer Low-Voltage Switchgear 4 kVA Amps Including Power Fuses TX and Protector NP 13

500 1200 2000 (908) 5600 (2542) 4000 (1816) 750 1600 2000 (908) 6700 (3042) 4000 (1816) 14 1000 1875 2000 (908) 8450 (3836) 4000 (1816) 1500 2500 2000 (908) 10,150 (4608) 4400 (1998) 2000 3500 2000 (908) 13,150 (5970) 4600 (2088) 2500 4500 2000 (908) 15,600 (7082) 4600 (2088) 15 4 Dimensions and weights are for standard VPI or VPE Dry-Type designs, 80 °C rise with fans with 150% continuous overload capacity and aluminum windings. Copper windings add more weight. Primary voltage is 15 kV, 95 kV BIL insulation. 16

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CA08104001E For more information, visit: www.eaton.com/consultants 18.0-40 Spot Network Equipment May 2017 Sheet 18 040

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For more information, visit: www.eaton.com/consultants CA08104001E