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Circuit Breaker Control Guidelines for Vacclad-W Metal-Clad Switchgear

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Circuit Breaker Control Guidelines for Vacclad-W Metal-Clad Switchgear Application Paper AP083012EN Circuit breaker control guidelines for VacClad-W metal-clad switchgear Circuit breaker control Control breaker control equipment Relays Eaton’s VCP-W circuit breaker has a motor charged Microprocessor-based or solid-state relays spring type stored energy closing mechanism. would generally require dc power or reliable Closing the breaker charges accelerating springs. uninterruptible ac supply for their logic circuits. Protective relays or the control switch will energize a shunt trip coil to release the accelerating springs Auxiliary switches and open the breaker. This requires a reliable Optional circuit breaker and cell auxiliary switches source of control power for the breaker to function are available where needed for interlocking or as a protective device. Figure 2 and Figure 3 control of auxiliary devices. Typical applications and show typical ac and dc control schematics for type operation are described in Figure 1 and Table 1. VCP-W circuit breakers. Breaker auxiliary switches and MOC switches For ac control, a capacitor trip device is used are used for breaker open/close status and with each circuit breaker shunt trip to ensure that interlocking. energy will be available for tripping during fault conditions. A control power transformer is required Auxiliary contacts available for controls or external on the source side of each incoming line breaker. use from auxiliary switch located on the circuit Closing bus tie or bus sectionalizing breakers breaker are typically limited in number by the will require automatic transfer of control power. breaker control requirements as follows: This control power transformer may also supply • Breakers with ac control voltage: 1NO and 3NC other ac auxiliary power requirements for the switchgear. • Breakers with dc control voltage: 2NO and 3NC For dc control, it would require a dc control When additional auxiliary contacts are needed, the battery, battery charger, and an ac auxiliary power following options are available: source for the battery charger. The battery provides • 5/15/27 kV breakers: Each breaker compartment a very reliable dc control source, because it is can be provided with up to three mechanism isolated from the ac power system by the battery operated cell (MOC) switches, each with 5NO charger. However, the battery will require periodic and 4NC contacts. The MOC switches are rotary routine maintenance, and battery capacity is switches, mounted in the cell, and operated by reduced by low ambient temperature. a plunger on the breaker. Two types of MOC Any economic comparison of ac and dc control for switches can be provided—MOC that operates switchgear should consider that the ac capacitor with breaker in connected position only, or trip is a static device with negligible maintenance MOC that operates with breaker in connected, and long life, while the dc battery will require as well as test position maintenance and replacement at some time in • 38 kV breakers: Each 38 kV breaker can be the future. provided with an additional breaker mounted auxiliary switch, with 5NO and 5NC contacts Another optional switch available is called a TOC–Truck Operated Switch, which is mounted in the cell and operates when the circuit breaker is levered into or out of the operating position. This switch changes its state when the breaker is moved from test to connected position and vice versa. The TOC provides 4NO and 5NC contacts. Auxiliary switch contacts are primarily used to provide interlocking in control circuits, switch indicating lights, auxiliary relays or other small loads. Suitability for switching remote auxiliary devices, such as motor heaters or solenoids, may be checked with the interrupting capacity listed in Table 1. Where higher interrupting capacities are required, an interposing contactor should be specified. Application Paper AP083012EN Circuit breaker control guidelines for VacClad-W metal-clad switchgear Signal: Initiation of Initiation of close signal trip signal VCP-W T circuit breaker C Closed main contacts Open Closing time Opening time = 45 – 60 ms = 30 – 45 ms if interrupting time = 83 ms = 30 – 38 ms if interrupting time = 50 ms Breaker auxiliary Closed switch 3 ms 3 ms ”a“ contact Open Breaker auxiliary “b” breaks 6 ms “b” makes 7 ms switch before “a” makes after “a” breaks ”b“ contact Closed -9 ms to -3 ms +4 ms to +10 ms Open Figure 1. Breaker auxiliary switch operating times Table 1. Auxiliary switch contacts interrupting capacities Control circuit voltage Auxiliary Continuous switch type current amperes 120 Vac 240 Vac 48 Vdc 125 Vdc 250 Vdc Non-inductive circuit interrupting capacity in amperes Breaker auxiliary switch 20 15 10 16 10 5 TOC switch 20 15 10 16 10 5 MOC switch 20 15 10 16 10 5 Inductive circuit interrupting capacity in amperes Breaker auxiliary switch 20 15 10 16 10 5 TOC switch 20 15 10 16 10 5 MOC switch 20 15 10 16 10 5 Table 2. VCP-W breaker stored energy mechanism control power requirements Spring charging motor Voltage range Rated Close UV trip Indicating control Inrush Run Average run or trip mA light voltage amperes amperes time, sec. amperes maximum Close Trip amperes 48 Vdc 36.0 9 6 16 200 38–56 28–56 0.02 125 Vdc 16.0 4 6 7 80 100–140 70–140 0.02 250 Vdc 9.2 2 6 4 40 200–280 140–280 0.02 120 Vac 16.0 4 6 6 — 104–127 104–127 0.02 240 Vac 9.2 2 6 3 — 208–254 208–254 0.02 2 EATON www.eaton.com Circuit breaker control guidelines for Application Paper AP083012EN VacClad-W metal-clad switchgear Control schematics ANSI Standard VCP-W breaker dc control schematic P (+) CS CS PR C T 11 Spring WL GL RL charged 9UV indicating light UV 10UV 14 LOCATIONTCSSLTTRCS_TRCO_51N dc source 12 1 2 4 7 5 6 7 8 9 10 3 9A 3 9 3A 13 61 Y 51 LS1 53 55 57 a bb a Y SR 62 52 56 58 54 ST ST 18 17 16 15 22 2 M 1 b b a LC a PS2 PS Y LS2 LS2 bb 1 bb aa 10A 13 4 14 6 10 Not available when second 24 21 20 19 LOCATIONTCSSLTTRCS_TRCO_51N LOCATIONCCBSN LOCATIONCGL LOCATIONTCSSLTTRCS_TRCO_51N trip coil option is chosen N Options (-) ANSI Standard VCP-W breaker ac control schematic 1 S-CPULOCATIONCAC120FUSES-TRUS-MRU CS C CS PR T 11 Spring WL GL RL charged 9UV indicating light UV 9UV 10UV 14 LOCATIONTCSSLTTRCS_TRCO_51N ac source ac (+) 12 UV 1 2 4 7 5 9 6 7 8 10 3 9A 3 Cap Trip Dev 9 13 55 3A 61 53 51 Y 10UV a 57 LS1 ac (–) a bb Y SR 54 62 52 58 ST ST 18 17 15 22 2 M 1 For ac UV b b a a trip only LC PS2 LS2 LS2 a bb PS Y 1 bb aa 10A 13 4 6 10 14 56 Not available when second LOCATIONTCSSLTTRCS_TRCO_51N 24 21 20 16 19 LOCATIONCCBSN LOCATIONCRL LOCATIONTRSSTRCS_TRCO_51N trip coil option is chosen 2 Options Figure 2. Typical 5/15/27 kV VCP-W “dc” and “ac” control schematics Legend Operation CS = Breaker control switch–close LS1 = Closed until springs are fully charged C bb CS = Breaker control switch–trip LS2 = Open until springs are fully charged T aa Y = Anti pump relay LS2 = Closed until springs are fully charged bb SR = Spring release coil (coil) LC = Open until mechanism is reset M = Spring charge motor PS1 = Open in all except between “test” and “connected” positions ST = Shunt trip PS2 = Closed in all except between “test” and “connected” positions PR = Protective relay ^ = Secondary disconnect ^ EATON www.eaton.com 3 Application Paper AP083012EN Circuit breaker control guidelines for VacClad-W metal-clad switchgear Breaker dc control schematic P S-CPULOCATIONCDC0FUSES-TRUS-MRU (+) CS CS PR C T 11 U1 U2 U3 U4 U5 U6 U7 U8 U9 U10 Spring WL GL RL charged indicating 9UV light UV U24 U24 U23 U22 U21 U20 U19 U18 U17 U16 U15 Auxiliary switch #2 optional 10UV 14 LOCATIONTCSSLTTRCO_51N dc source 12 OPTIONS 1 2 4 7 5 6 7 8 9 10 3 3 9 9A 3A 13 57 61 51 Y 53 55 LS1 a bb a 54 SR 62 Y 52 56 58 ST 2 ST LOCATION 18 17 16 15 22 M b b 1 Customer must furnish LC a 10A PS2 PS Y LS2 LS2 13 bb 1 bb aa LOCATIONTCSSLTTRCO_51N this a contact from 4 6 10 14 a auxiliary switch when 24 21 20 19 N LOCATIONTCSSLTTRCS_TRCO_51N second trip coil option (-) is chosen and make the appropriate connections Breaker ac control schematic 1 CAC120FUSES-TRUS-MRUS-CPULOCATION CS C U1 U2 U3 U4 U5 U6 U7 U8 U9 U10 CS PR T 11 Spring WL GL RL charged U24 U24 U23 U22 U21 U20 U19 U18 U17 U16 U15 indicating 9UV light Auxiliary switch #2 optional UV 10UV 9UV 14 OPTIONS LOCATIONTCSSLTTRCO_51N ac source ac (+) 12 UV 1 2 4 7 5 9 6 7 8 10 3 3 9 CAP TRIP DEV 9A 61 3A 13 55 51 10UV Y a 53 57 LS1 ac (-) a bb 62 52 58 Y SR 54 ST ST 2 LOCATION 18 17 15 22 M 1 For ac UV b b a LC 10A trip only PS2 PS Y LS2 LS2 a 13 bb 1 bb aa LOCATIONTCSSLTTRCO_51N 4 14 6 56 10 a 24 21 20 16 19 Customer must furnish LOCATIONTRSSTRCS_TRCO_51N 2 CONTACTS-CPLSAACCNLOCATIONCAC120MOTORCL_STDCL_GRCRLTRIPS-TRLS-MRLLOCATIONFUSES-MRU this a contact from auxiliary switch when second trip coil option is chosen and make the appropriate connections Figure 3.
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