Designation and Documentation Part 1: Structure and Nomination

Interessengemeinschaft Energieverteilung

Electrical energy transmission and -distribution - Substations

Designation and Documentation

Part 1: Structure and Nomination Regulation in accordance with IEC 81346

3. Edition – A (English translation 2019): 2011-05-18

© IG EVU 2005 – Copyright - all rights reserved Printing and utilization of this document in the context of an enquiry or order, as well as for the purpose of training are permitted. The reproduction, distribution and utilization of this document as well as the communication of its contents to others without express authorization is prohibited. Offenders will be held liable for the payment of damages. All rights reserved in the event of the grant of a patent, utility model or design.

1_reference_designation_2011_05_18.docx - 2 -

Designation and Documentation

Part 1: Structure and Nomination Regulation in accordance with IEC 81346

This part of the IG EVU publication series was written by the German IG EVU-working group “Structuring and Designation”. It contains the following parts:

IG EVU-01 Designation and Documentation - part 1: Structuring principles and Reference designation in accordance with IEC 81346 IG EVU-02 Designation and Documentation - part 2: Designation and order of Documentation in accordance with IEC 61355 IG EVU-03 Designation and Documentation - part 3: Planning Tool for Structuring and Designation IG EVU-04 Designation and Documentation - part 4: Examples of Documents in accordance with IEC 6102, IEC 81346 and IEC 61355

This publication series is an application of IEC 81346 and IEC 61355 developed by the German electrical energy transmission companies to create a common standard for technical documentation in German speaking countries.

Preface

IEC 81346 is the basis for the international classification of objects, and IEC 61355 is the international classification of nomination of documents. (IEC 81346 is the new edition and successor of IEC 61346. Non-electrical interests drove this review. The rules have been altered as little as possible. However, additional letters have been defined for main classes and in particular for subclasses.)

The standard is valid for all electrical and non-electrical objects. The benefit of IEC 81346 compared to earlier versions is the efficiency in using the designation principles and will result in less effort. Therefore, the following benefits are noteworthy and will help to improve future documentation:

- The classification is applicable for all departments and disciplines and is no longer restricted to electrical engineering. For example, constructive and constructional objects like steel and civil engineering works can easily be integrated in the same classification system.

Note: The new standard requires new schematic representation and letter designations because previously only electrical equipment had been considered.

- The classification system enables, if properly applied, the integration of any system and components without changing previously defined nomination.

- Classification designations are not restricted to a fixed grid (e.g. designation block and data bits). Therefore, the designation system is flexible and expandable in upper and lower directions. Note: This may complicate the interpretation of the reference designation. Therefore, the tree structures used must be documented.

- The application of different aspects enables the independent designation (e.g. of functions) regardless of their products (devices) and locations, which implement this function. Note: Until now only the designation of objects and location was possible. The meaning of the prefix has changed because of the new definition in the current version.

- By applying IEC 61355, a separation of document designation and object designation for the displayed objects is reached. *

- The different aspects (views) enable a state of the art and virtually unlimited structural definition of selection criteria. This can be used, for example, for the automatic generation of documents.

Predictably, the user will question the purpose of the specific designation. Many benefits will only become visible during the innovative application of data processing. The goal is to implement the documentation as a resource for specified tasks. IEC 81346 reference designation is a necessary requirement.

1 Scope ...... 6 2 Normative references...... 6 3 Terms and Definitions ...... 7 4 Structuring Principle ...... 8 4.1 General Information ...... 8 4.2 Procedure ...... 8 4.3 Product related Structure ...... 9 4.4 Function related Structure ...... 11 4.5 Location related Structure...... 13 4.6 Multiple Structures in Parallel ...... 14 5 The Generation of Reference Designation ...... 14 5.1 General Information ...... 14 5.2 Single Level Designation ...... 15 5.3 Linking of Single-Level Reference Designation ...... 16 5.4 Product related structure and designation ...... 16 5.5 Function related Structure and Classification ...... 18 5.6 Location related Structure and Designation ...... 20 5.7 Designation of the highest Node in a Structure ...... 21 5.8 Reference Designation Set ...... 21 5.9 Aspects for the Distinctive Designation of Objects ...... 23 6 Special Cases of the Product Reference Designation ...... 24 6.1 General Information ...... 24 6.2 Designation of Cables ...... 24 6.3 Examples for Designation of Cables with Plugs ...... 25 6.4 Examples for the Designation of Objects in Relay Houses or Containers ...... 26 6.5 Examples of Designations of Objects with Pole Correlation...... 27 6.6 Phase Allocation of Objects ...... 28 6.7 Examples for the Designation of Isolators with Single Poles or Common Drive ...... 28 6.8 Examples for the Designation of Busbars in High- and Medium Voltage Substations...... 29 6.9 Designation of Gas Compartments and respective Monitoring Systems in Encapsulated Substations ...... 30 6.10 Information of Reference Designation on Identification Plates ...... 32 6.11 Use of Reference Designation in Documents ...... 33 6.12 Relationship between Reference Designations under various Aspects ...... 34 7 Objects Classification...... 36 7.1 General ...... 36 7.2 Table 1 - Classes of Objects according Purpose or Task ...... 36 7.3 Table 2 – Subclasses for Classes according to Table 1 ...... 42

7.4 Table 3: Classification of Infrastructure Objects ...... 60 7.5 Table 4: Subclasses for particular Classes according to Table 3 ...... 61 Annex A ...... 64

1 Scope

This document consists of definitions regarding the classification of objects in electrical distribution and transmission substations and associated code letters as well as hints for use. The subject-specific definitions are based on the standards of series IEC 81346 (the subsequent issue of IEC 61346) in their unaltered original form.

The object classes are valid for all types of objects. This includes electrical, mechanical and constructional objects as well as functions and locations.

Distribution and transmission substations can be integrated in higher level installations without altering the defined reference designations, provided that the definitions follow the rules of IEC 81346.

Note: Higher level installations are defined as industrial facilities, power plants, high voltage networks, railway facilities, trains, ships, drilling platforms, etc.

2 Normative references

The following standards were valid at the time of drafting or were ready for publication. Standards can change over time. The user is required to find and use the current standard.

IEC 81346-1: 2009 Industrial systems, installations and equipment and industrial products – Structuring principles and reference designations – Part 1: Basic rules

IEC 81346-2: 2009 Industrial systems, installations and equipment and industrial products – Structuring principles and reference designations – Part 2: Classification of objects and codes for classes

IEC 60050-nnn International Electro Technical Vocabulary (IEV) [nnn shows the relevance chapter]

Withdrawn standards (for information):

DIN 40719-2: 1978 Circuit diagrams, part 2: designation of devices (German standard) (withdrawn 2000-12-01) IEC 750: 1983 Item designation in electro technology (withdrawn 1996-03) IEC 61346-1, -2 Industrial systems, installations and equipment and industrial products – Structuring principles and reference designations – Part 1: Basic rules (The rules are basically unchanged in the subsequent standard IEC 81346)

IEC/PAS 62400 Structuring principles for technical products and technical product documentation - Letter codes - Main classes and subclasses of objects according to their purpose and task (in revised form adopted in IEC 81346-2)

The following terms and definitions apply for the purposes described in this document.

3.1 System A set of interrelated objects considered in a defined context as a whole and separately from their environment. [IEC 81346-1]

3.2 Aspect A specified way of viewing an object. [IEC 81346-1]

3.3 Object Entity treated in a process of development, implementation, usage and disposal. [IEC 81346-1] Note 1: The object may refer to a physical or non-physical “thing” meaning, anything that might exist, exists or did exist. Note 2: The object has information associated to it.

3.4 Plant A assambly of different systems in a specific site. [IEC 61355]

3.5 Switchgear / Control gear A general term covering switching devices with associated control, measurement, protection and regulation devices and their combination with associated control, measuring, protective and regulating equipment, also assemblies of such devices and equipment with associated connections, accessories, enclosures and supporting structures. [IEC 60050-441 (IEV 441-11-01)]

3.6 Station A part of a power system, concentrated in a given place, including mainly the terminations of transmission or distribution lines switchgear and housing and which may also include transformers. It generally includes facilities necessary for system security and control (e.g. the protective devices). [IEC 60050-605 (IEV 605-01-01)]

3.7 Reference designation An Identifier of a specific object formed with respect to the system of which the object is a constituent, based on one or more aspects of that system. [IEC 81346-1]

3.8 Reference designation set A collection of two or more reference designations assigned to an object of which at least one unambiguously identifies this object. [IEC 81346-1]

3.9 Structure An organization of relations among objects of a system describing constituency relations (consists-of / is-a-part-of). [IEC 81346-1]

4.1 General Information

To effectively specify, design, produce, maintain, operate or to decommission a system, this system and the information about this system should be subdivided in separate parts. The subsequent division in parts and their parts as well as the organization of the subdivision is named structuring.

The designed structures are used to: - organize the information of a system - organize the documentation and the contents within any given document (see part 2 of publication series) - navigate within the information of a system - define reference designations (see part 5)

It is important to define the necessary structures at the beginning of a project as far as possible. A structure considerably simplifies planning and enforces a system which increases efficiency.

It is necessary to separate structuring and designation of objects within a structure as two independent processes. Structuring should generally occur first, and object classification and reference designation should follow.

The structuring in accordance with IEC 81346-1 is done by the application of aspects. An aspect describes a respective view of an object, meaning, from which perspective an object is viewed. The following main aspects are defined: - product view (designated by sign -) - function view (designated by sign =) - location view (designated by sign +).

There can be additional aspects according to the standard which are not part of this document.

4.2 Procedure

In accordance with IEC 81346-1 the structuring and the definition of designation proceeds logically in the following steps: - clear distinction between the viewed and the structured objects - choice of preferred aspects - defining the partial object in the respective aspect - further subcategorization of these partial objects - classification and designation of each defined partial object

The structuring of a technical system must be implemented as an organization of relations among objects of a system (consists of / as a part of). The structures are created step by step following a top down or a bottom up hierarchy.

The standard principally permits to alter the aspect regarding the subcategories of a structure. This should only be done under exceptional circumstances in strict compliance with rules defined in other IEC publications.

The continuous retention of an aspect within one structure is recommended.

The station is the viewed and structured object of superior order within this document. The structure can be extended upwardly as required. E.g. if all stations and lines should be regarded as part of a grid or part of a superior unit.

In general, all specified aspects of IEC 81346-1 (functional-, product- and location aspect) can be used. The decision if one or more aspects should be chosen according to the intended aim. Each structure requires a clear purpose.

4.3 Product related Structure

The product related structure documents how physical objects (facilities, facility units, construction units and groups, etc.) are comprised meaning, of which parts they consist.

The product related structure defines the component objects which comprise a facility, a system or a product.

A product related structure reflects the mechanical/physical composition of a system. It shows the subdivision of a system regarding existing properties concerning the product aspect, not including possible function or location aspects of the object.

Figure 1 gives an example (section) of the product related subdivision of a station. In this phase the objects are defined by written product name only. The classification of identifiers is done later (see Chapter 5.4)

station bus 1. substation 380 kV control cable 2. substation 380 kV

1. substation 110 kV control board transformer substation metering cubicle 380/110 kV

transformer substation interface cubicle 110/10 kV

parallel switching system

1. AC 400/230-V-distribution protection cubicle 1 2. AC 400/230-V- distribution protection cubicle 2 DC 220-V- distribution DC 60-V- distribution feeder 1 air conditioning feeder 2 control cubicle fire protection system feeder 3 protection cubicle 1

building power distribution 1 feeder 4 protection cubicle 2 MCB

building power distribution 2 feeder 5 HV-power rails protection relay building power distribution 3 sub distribution earthing cables video-surveillance system busbars field bus telecommunication system earthing cables control cable civil infrastructure station bus circuit breaker

control cable switch relays

switch unit

drive unit control cables, wires sockets, terminals busbar isolating switch1

busbar isolating relays switch 2 switch isolating switch MCB

control unit earthing switch1 drive unit control cables, wires earthing switch 2 sockets, terminals

earthing switch

voltage transformer 1 current transformer 1

Figure 1 – Example of a Product related Structure

The product aspect structure fulfills the task formerly fulfilled by conventional reference designation systems. Furthermore, the aspect structure covers the classification of devices in accordance with DIN 40719, Part 2 completely.

Note: Within DIN 40719, part 2 (withdrawn) the combination of designation part station (=), location (+) and type, sequence number, function (-) was fixed. “station” as well as “location” however were applied to group and classify products for facilities of higher order. This follows the principal of the product view as stated in IEC 81346.

It is recommended that all objects (equipment) should at least be structured and classified in the product view.

All other aspects can be considered as additional information to be referred to if necessary or as required.

4.4 Function related Structure

The function related structure can and should be fixed in the early planning stages of the station. The structuring improves the systematic collection of data concerning the requirements of the operator. At this stage it is generally not necessary to take final as-builds into account.

The function related structure defines objects for functions and sub-functions regardless of the final technical realization.

Ideally, the function related structure would be done initially during planning. The function related structure is suitable for placing neutral standards for functional application. (This function related structure establishes the framework for the creation of generic standards for functional applications.)

Figure 2 shows an example of functional substructure of a station. At this stage objects are classified as written functional names. Functional terms should be used to avoid confusion with product terms.

An example would be the function “transform 380/110kV”. The question of transformers with 2 or 3 windings is irrelevant and can be ignored. At first level, see example (Figure 2), the transformer function between 2 voltage levels is classified as a group. This is advisable if superior functions exist in this group, for example, a common voltage regulation. The design of the transformers is only relevant for the product related structure.

The objects in the function related structure are not identical with product structure objects. The classification of identifiers is done later (see Chapter 5.5).

IG EVU-001E: Designation and documentation – Part 1 English translation. 2019-09-18 © IG EVU 2005 – copyright – all rights reserved - 12 - switchgear distribute 380 kV (1) distribute 380 kV (2) distribute 110 kV control (switchyard) distribute 10 kV message (switchyard) distribute AC 400/230 V measure (switchyard) distribute DC 220 V protect (switchyard) distribute DC 60 V station air condition power switch 1 (feeder function) fire monitoring building power supply power switch 2 control (bay) (bay function) area monitoring message (bay) telecommunication power switch 3 measure (bay) (bay function) protect (bay) power switch 4 power switch (bay function) control power switch 5 protect (bay function) message electrical power monitoring distribution (busbar function) power switch conduct electrical energy

power circuit isolation (busbar 1) power circuit isolation control (busbar 2) message power circuit isolation monitoring (OHL) power switch power circuit earth, conduct electrical (circuit breaker) energy power circuit earth, (OHL) conduct electrical energy

transform 380/110 kV transform 110/10 kV control (group) message (group) measure (group) protect (group) transform 1 transform 2 control message measure protect transform

Figure 2 – Example of a Function related Structure

4.5 Location related Structure

The location related structure defines space and spatial structures. The target is to clearly classify spatial structures and to interrelate them with other structures.

The location related structure defines objects for spaces such as areas, buildings, hallways, rooms, general areas etc.

This structure is recommended to simplify spatial orientation in a facility. This is especially recommendable in spatially extended facilities, or in the case that external personnel require orientation. The application should be decided on a case by case basis.

Note: in accordance with DIN 40719, part 2 control cubicles, control desks and control displays were identified with location indicators. These indicators never exactly defined the place of installation (e.g. room, coordinate). Because these units should be regarded as a product combination in the product view (product view in accordance with IEC 81346), they are now displayed in a product structure. The location where these units are placed can then additionally be represented by an object in the location related structure.

Figure 3 gives an example (partial view) of the location related structure of a station. At this stage the objects are classified as written names. The classification of reference identifier is made later (see Chapter 5.6).

switchgear control building 380-kV-switchyard area feeder 1 area feeder 2 area feeder 3 area feeder 4 container 1 container 2

110-kV-building 1 110-kV-building 2 ground floor 20-kV-building HV-hall transformer area 1 distribution room transformer area 2 battery room device storage garage transportation ways spare parts store parking floor 1. floor control room tele communication room lounge 2. floor sanitary room roof surface floor basement cable cellar 1 stairwell cable cellar 2 elevator shaft water tank room safety area (fence) monitoring sector

Figure 3 - Example of a Location related Structure

4.6 Multiple Structures in Parallel

Depending on the number of views used for structuring there can be multiple structures in parallel beginning with a common object located at the top (top node), see Figure 4.

Figure 4 – Example of Several parallel Structures

The multiple structures should preferably be constructed separately, and the sub objects, should be set in relation to each other if necessary.

For an example see Chapter 5.8 and 6.12.

The circuit breaker (as a product) fulfills the function “switching” and “protecting”. The circuit breaker is part of a cubicle. The cubicle is placed within a room.

5 The Generation of Reference Designation

5.1 General Information

After creating the structure, as described above, a designation can be created for each object so that the objects can be recognized in relation to each other.

An object only has a reference designation if it is part of a higher lever object meaning, it is incorporated in the structure.

For reference purposes of this guideline the station is the highest-level object. This corresponds with the highest-level hub of each structure in relation to the station. According to the regulations this object doesn’t immediately receive a reference designation. The highest-level hub only receives a reference designation when this object is incorporated into a higher-level structure. (Example: station view from load dispatch center aspect). This generally also applies for the highest-level hub of all delivered components. The reference designation in both of these cases is only created when integrated in a higher-level structure (please refer to Chapter 5.7 for further information about further designation of the highest- level hub).

5.2 Single Level Designation

A reference designation, which is referred in the standard as “single level designation”, for a single object in a structure is created with the following items:

- minus or plus or equal sign (-, +, =), which indicates the aspect - a classification by a code letter for the class or subclass to which the object is assigned (see Section 7, Table 1 or Table 3). - a number which clearly states the reference designation.

The specifications in Figure 5 apply to electrical energy transportation and distribution stations regarding the assignment of classes to the objects beyond classification level 1 within function and product structure. A case by case evaluation must be made for the location related structure.

Note: A subclass doesn’t constitute a new classification level. Class and subclass refer to one and the same object. Sub-categories only describe a further categorizing feature of the object.

The structures and the respective class assignment to a classification level must be documented.

Figure 4.2 shows how the aspect changes form one classification level to the next. This only influences the choice of sign (+, -, =) but not the class assignment.

Figure 5 - Class Assignment of Classification Levels within the Function and Product Structure.

Numbers don’t have a fixed meaning. They only have the task to distinguish between similar objects. (In certain cases, it’s useful to retain the numbers in repetitive tasks in order to adhere to the standard. For examples see appendix A).

Objects can be designated without code letters for object allocation and be designated with only a number in individual cases (see Figure 14).

In accordance with IEC 81346-1 the following forms of single-level reference designation are allowed (pointed out in product aspect as an example):

- sign, code letter of a class (possibly for sub class), number, e.g. –A1, -AB1; - sign, number, e.g.: -1, -21 - sign, code letter of a class, e.g.: -A (this application should be avoided in electrical energy transmission and – distribution stations).

Note: The application of a code letter for a device function in the identification block type, counting number and function according to the withdrawn German standard DIN 40719, part 2 isn’t possible anymore. The classification of conductor or phase devices (previously by attaching e.g. L1, L2, L3 to the device designation) isn’t part of the reference designation anymore. (A “phase” isn’t a part of an isolator).

5.3 Linking of Single-Level Reference Designation

Reference designations are created by linking the individual nodes to the respective single- level reference designation. The respective path in the tree structure is to follow top down in order to achieve this target. This creates reference designations in the following format: (example of a product relevant structure)

-A1-B1-C1-D1 Notation with identical meaning are –A1B1C1D1 or –A1.B1.C1.D1

These dots can serve as separating designations and have no own meaning, but rather the meaning of the replaced sign.

A separating designation must be specified to illustrate a classification level if similar reference designations are in series (e.g. consecutive numbers). Example: -A1B1.1 or – A1B1-1. As a result, the reference designation –A11 and –A.1 respectively have a different meaning (-A11 is a single object; and –A1.1 identifies an object -1 which is an element of – A1)

The relevant sign must also be indicated when the aspect changes between levels.

For consistency purposes and to avoid confusion it is recommended to always explicitly illustrate signs in every classification level.

5.4 Product related structure and designation

The product related structure and the respective reference designation should be used when physical objects must be clearly identified. Because this is the main designation task in plants, sub plants and units, the product related reference designation should be specified for each used product. Note 1: In accordance with DIN 40719, part 2 only one plant designation could be related to a product. This was a fixed part of the dedicated equipment designation. Now, more functions can be dedicated to a product. Hence the functional designation can’t serve as a dedicated designation. This results in the recommendation that only the product related reference designation should be used for a dedicated designation of products (equipment).

Note 2: The product related designation completely correlates to the structure of the previous designation with the three designation signs (=, +, -) according to DIN 40719, part 2. However, the code letters only partly change.

Figure 6 shows an example of the product related structure of Figure 1. Each object is identified by their distinct product related reference designation. Some objects have code

letters for subclasses.

switchgear -A1 superior equipment -W F1…n station bus -C1 1. substation 380 kV -W G1…n control cable -C2 2. substation 380 kV -E1 1. substation 110 kV -S1 control board -T1 transformer substation -P1 metering cubicle 380/110 kV -T2 transformer substation 110/10 -K1 interface cubicle kV -K2 parallel switching system -NE1 1. AC 400/230-V-distribution -B1 protection cubicle 1 -NE2 2. AC 400/230-V- distribution -B2 protection cubicle 2 -NK1 DC 220-V- distribution -NQ1 DC 60-V- distribution -Q01 feeder 1 -XA1 air conditioning -Q02 feeder 2 -S1 control cubicle -XB1 fire protection system -Q03 feeder 3 -B1 protection cubicle1 -XC1 building power distribution 1 -Q04 feeder 4 -B2 protection cubicle2 -F1 MCB -XC2 building power distribution 2 -Q05 feeder 5 -W B1…n HV-power rails -B1…n protection relay -XC3 building power distribution 3 -W C1…n sub distribution -W E1…n earthing cables -Y1 video-surveillance system -W A1…n busbars -W F1…n field bus -Y2 telecommunication system -W E1…n earthing cables -W G1…n control cable -Z1…n civil infrastructure -W F1…n station bus -QA1 circuit breaker

-W G1…n control cable -B1 switch -K1…n relays

-Q1 switch unit -M1 drive unit -W 1…n control cables, wires -X1…n sockets, terminals -QB1 busbar isolating switch1 -QB2 busbar isolating -K1…n relays switch 2 -P1…n switch -QB9 isolating switch -F1 MCB -Q1 switch unit -QC1 earthing switch1 -M1 drive unit -W 1…n control cables, wires -QC2 earthing switch 2 -X1…n sockets, terminals

-QC9 earthing switch

-BA1 voltage transformer 1 -BC1 current transformer 1

Figure 6 - Example for Product related Reference Designation

Examples:

Object Reference designation Signaling switch in CB 1 in the feeder 1 of the second 380 kV -C2-Q01-QA1-B1 station Protection cubicle of bay 5 of the second 380kV station -C2-Q05-B1 Current transformer 1 of bay 5 of the second 380kV station -C2-Q05-BC1

The structure determines also the cable designations. Cables connect different object parts. Therefore, they are part of those objects, of which they are completely designated. The highest-level node has no reference designation. This results in the classification of the cables as a part of a classified object A in the first classification level.

Object Reference designation Control cable in the CB of bay 1 of the second 380kV station -C2-Q01-QA1-W1 Control cable within bay 1 of the second 380kV station -C2-Q01-WG1 Control cable within the second 380kV station (e.g. between two -C2-WG1 bays) Control cable in the station (e.g. between the 110kV station and -A1-WG1 380kV station

Further examples and exceptions of the product related structure and the reference designation can be found in Chapter 5.8.

Product related reference designation identifies equipment parts, equipment units or stations. These reference designations must be visibly attached to the identification plate in the area of the physical object.

The product related reference designation should be the only designation for the supplied equipment units or components (except possible installment locations). Generally, the supplier isn’t familiar with (and doesn’t need to be familiar with) the planned classification of a function in the main process of the station. This enables the production of user neutral standard components and facilitates the integration into the planned structure.

In accordance with the requirements of IEC 81346 the supplier doesn’t identify the highest-level node of the reference designation.

5.5 Function related Structure and Classification

Figure 7 shows an example of a function related structure in Figure 2. Every object is clearly identified by a function related reference designation. Some objects have been assigned to subclasses.

Table 3 and sub classes Table 1 Table 1 and sub Table 1 and sub according to Table 4 classes according to classes according to Table 2 Table 2 switchgear =C1 distribute 380 kV (1) =C2 distribute 380 kV (2) =E1 distribute 110 kV =S1 control (Switchyard) =K1 distribute 10 kV =P1 message (Switchyard) =NE1 distribute AC 400/230 V =P2 measure (Switchyard) =NK1 distribute DC 220 V =F1 protect (Switchyard) =NQ1 distribute DC 60 V =XA1 station air condition =Q01 power switch 1 (bay function) =XB1 fire monitoring =XC1 building power supply =Q02 power switch 2 (bay =S1 control (Bay) function) =Y1 area monitoring =P1 message (Bay) =Y2 telecommunication =Q03 power switch 3 (bay =P2 measure (Bay) function) =F1 protect (Bay) =Q04 power switch 4 (bay =QA1 power switch function) =S1 control =Q05 power switch 5 (bay =F1 protect function) =P1 message =W 1 electrical power =P2 monitoring distribution (busbar function) =Q1 power switch =W B1 conduct electrical energy

=QB1 disconnect power circuit (Busbar1) =QB2 disconnect power =S1 control circuit (Busbar2) =P1 message =QB9 disconnect power =P2 monitoring circuit (OHL) =Q1 power switch =QC1 earth power circuit, =W B1 conduct electrical (circuit breaker) energy =QC9 earth power circuit, (OHL) =W B1 conduct electrical energy

=T1 transform 380/110 kV =T2 transform 110/10 kV =S1 control (Group) =P1 message (Group) =P2 measure (Group) =F1 protect (Group) =T1 transform 1 =T2 transform 2 =S1 control =P1 message =P2 measure =F1 protect =T1 transform

Figure 7 - Example of Function related Structure with Reference Designation

Examples:

Object Reference designation Functional control of bay function 1 “power =C2=Q01=QA1=S1 switching” of the second 380kV distribution function The “protect function” of bay function 5 of the =C2=Q05=F1 second 380kV distribution function

Function related reference designation doesn’t identify equipment parts, equipment units or stations in this case.

These reference designations may be added as additional information to the visibly attached identification plate in the area of the physical object. However, they must be clearly distinguished from the reference designation identifier (see Chapter 6.10).

5.6 Location related Structure and Designation

Figure 8 is an example for the location related structure of Figure 3. Every object is clearly identified by a location related structure designation. The object classification within the classification levels was implemented according to practical considerations. A common determination is almost impossible because of locational and spatial facts. Locations as indicated in the example should initially be viewed independently from the equipment to be installed. A location doesn’t define which products are placed, nor the planning person does. Therefore, classification according to purpose and task is senseless in most cases. In the example code letters according to Table 3 were used in classification levels 1 and 3. In the classification level 2 code letters were freely selected, partially according to Table 1. The higher level location structure is often predetermined for stations which are integrated in larger facilities (e.g. in an industrial complex).

Table 3 In this example Table 3 freely selected

switchgear +A1 control building +C1 380-kV switchyard +Q01 area feeder 1 +Q02 area feeder 2 +Q03 area feeder 3 +Q04 area feeder 4 +K1 container 1 +K2 container 2

+E1 110-kV-building 1 +E2 110-kV-building 2 +B1 ground floor +J1 20-kV-building +C1 high voltage room +T1 transformer area 1 +N1 distribution room +T2 transformer area 2 +N2 battery room +U1 device storage +V1 garage +Z1 transportation ways +U1 spare part store +Z2 parking +X1 floor +C1 1. floor +A1 control room +A2 telecommunicatio n room +W 1 lounge +C2 2. floor +W 2 sanitary room +D1 roof surface +X1 floor +A1 basement +C1 cable cellar 1 +Z1 stairwell +C2 cable cellar 2 +Z2 elevator shaft +U1 water tank room +Z3 safety area (fence) +A1...10 monitoring sector

Figure 8 – Example of Location related Structure with Reference Designation

Examples:

object Reference designation Battery room on ground floor of the first building of 110kV +E1+B1+N2 The 7th control section in the defined safety zone (fenced area +Z3+A7 of the station)

Location related reference designation also identifies object described locations in which equipment parts, equipment units or stations could be installed. These reference designations should be visibly attached to the identification plate assigned to a location (near or on the door, on the assembly frame, etc.) or at least indicated in the documentation.

5.7 Designation of the highest Node in a Structure

According to the rules the highest node of a structure – and therefore the object, which is represented by the highest node – doesn’t have any reference designation. However, this object must be identifiable in another way.

Generally the object-ID is used for identification (product number, catalogue number, order number, etc.). If the object-ID isn’t predetermined the designer may choose an object number at will, e.g. as a clear text term. Therefore the user must ensure that the determined Object-ID is distinct within the framework of the application. The IEC 81346-1 provides the option to prefix the object-ID in angle brackets in front of the reference designation (for partial objects of the object).

Examples: A motor has the product number 3MOT1234-1; a temperature monitor inside the motor has the reference designation –B2. Then the combined representation is:

<3MOT1234-1>-B2

The highest node for a transformer substation is identified with STATION (determined at will); an included 110kV side has the reference designation –E1. Then the combined representation is

-E1

If this object is included in a higher order structure the object-ID will be replaced by the determined reference designation from the higher-level structure.

5.8 Reference Designation Set

In accordance with the rules of IEC 81346 a designated object must always have a distinctive and unique reference designation. Further reference designations can be added to this object. These further designations don’t relate to the object itself but rather refer to the objects in parallel structures (see Figure 9). An object with several reference designations is referred as a reference designation set. The following rule is to be followed:

At least one reference designation in a set must be unique

In Figure 9 the circuit breaker implements the function e.g. “switch” and “protect” and is installed in a defined room. Therefore, a unit, which is distinctively designated in the product aspect, can additionally have one or more reference designations in the function aspect. The designation connects the function to the respective unit, meaning, an object in the function related structure is referred to the function related reference designation. A further reference designation indicates where the circuit breaker is located.

Figure 9 - Reference-Designation-Set documents the Relation between Objects

The reference designation set, which belongs to the object “circuit breaker” in the above- mentioned figure, is as follows:

…-UC1-QA1 (distinctive reference designation of the circuit breaker)

…=WP1=WC1=FC1

…=WP1=WC1=QA1

…+B1+S3+R2

Please note that parts of a reference designation set are separated from each other and shall not be linked. The sequence of the presentation is irrelevant.

The possibility of appointing multiple reference designations requires that the unique reference designation must be clearly determined. This requirement can be fulfilled e.g. by using a documentation, universal definition which applies to the overall documentation. The deciding factor for the selection of an aspect in this case is that a reference designation in the main view of an object is generally unique (see Figure 5.9).

It’s not always useful nor practical to represent the complete reference designation set in every presentation of the respective object in documents. The possible amount of reference designations in addition to the unique reference designation in the main aspect may cause confusion.

At least the unique reference designation must be indicated in the presentation of an object in documents. Further reference designations are optional.

If necessary, it may be advisable not to represent additional reference designations but rather to provide these as a “back up” (e.g. in a data base). This allows the implementation of specific computer aided analysis. For example, a document could be generated which demonstrates which products are involved in the realization of the required function. For further models see Chapter 6.12

5.9 Aspects for the Distinctive Designation of Objects

As mentioned before, an object must have at least one unique reference designation. Unique reference designations can be secured in the (so called) main aspect of an object. The general recommendation is that a viewed object should be designated according to the main aspect depending on the type of the viewed object, meaning,:

- Products in the product aspect - Functions in the function aspect, - Location in the location aspect.

The following statements are valid under compliance with these recommendations:

- the product structure and relevant reference designations are used for identification of facilities, facility units, construction units and groups, etc.

- The function related structure and relevant reference designation are used for distinct identification of objects that describe purpose or tasks (functions), independent of their realization.

- The local structure and relevant reference designations act as identification of locations areas, buildings, hallways, rooms and general areas etc.

In some cases reference designations can lead to unique designations in other aspects than the main aspect:

- if the unit completely implements the function (meaning, no further object is necessary for the execution of the function) then the reference designation in the functional aspect defines the distinctive identification of the constructional unit indirectly. This will, however, very rarely be relevant.

- If the constructional unit is the only object in the indicated location the reference designation in the location aspect indirectly defines the unique identification of the constructional unit.

This option should only be used as an exception.

6.1 General Information

Further examples of the product reference structuring and designation are shown in the following examples. These examples can be used as models for similar reference designation tasks.

6.2 Designation of Cables

The concept of the product related reference designation for cables (designation letter W) is described in Figure 10. Cables become an independent element of a higher-level object and are not assigned to a starting location or final location (Regarding exceptions, e.g. the cable is an integrated element of a component which is to be connected - see Figure 6.3).

Figure 10 – Principle of Cable Designation

As an example, the cable which connects the components –S1 and –B2 within –E1-Q02 is not a part of –S1 nor –B2. This cable is on an equal level to –S1 and –B2 and a part of –E1- Q02.

The following reference designations are possible:

Cable from Cable to Reference designation of cable -E1-Q01 -E1-Q02 -E1-W1 -E1-Q01-S1 -E1-Q02-C2 -E1-W2 -E1-Q01 -E1-Q02-S1 -E1-W3 -E1-Q02-S1 -E1-Q02-B2 -E1-Q02-W1

6.3 Examples for Designation of Cables with Plugs

Normally, connectors consist of two parts, e.g. female and male part. These are respectively treated as separate objects. Therefore, both parts receive different reference designations, meaning, each part is addressed separately. Note: Until now the complete connector is designated as one object with one device designation. It was only possible to indirectly distinguish between the upper and the lower part of the connector.

Using cables, which are connected through plugs to units, it should be considered which part of the plug is a part of which object. The following figure presents a few examples: - a connector is firmly attached (pre-assembled) to the cable and only needs to be plugged to the unit on-site. - Upper and lower part of the connector are both elements of the supplied unit. The cable must be connected on-site. - A cable is firmly attached on one side to the unit (as delivered) and must be connected to a further unit with a plug.

-E1-Q07-S1 -E1-Q07-B1 110-kV- -E1 switchgear 1 -E1-Q07-WG11 -Q07 bay 7 protection -B1 -X1 -X2 cubicle -XG7 -W1 -XG4 -XG4 socket 4

-S1 control cubicle -XG7 socket 7

control cable -WG11 11 -X1 socket 1 -X2 socket 2

-E1-Q07-S1 -E1-Q07-B1 -W1 cable -E1 110-kV- switchgear 1 -XG7 -XG4 -Q07 bay 7 protection -B1 cubicle -1 -2 -E1-Q07-WG11 -2 -1 -XG4 socket 4 -1 -S1 control cubicle -2 -XG7 socket 7

control cable -1 -WG11 11 -2 -E1-Q07-QA1 -E1-Q07-S1 110-kV- -E1 switchgear 1 -Q07 bay 7

-XG1 -QA1 circuit breaker -WG1 -XG5 -WG1 cable 1 -XG1 socket 1

-S1 control cubicle -XG5 socket 2

Figure 11 – Designation of Cables with Plugs

6.4 Examples for the Designation of Objects in Relay Houses or Containers

Relay houses in outdoor air insulated switchgears generally contain units which can be clearly assigned to a feeder and, in addition, to higher level units which aren’t assigned to a feeder but are associated with the respective plant. In this case, a structure and a respective reference designation according to Figure 12 can be used. The relay house itself is not visible in the product related structure from this point of view. A reference designation for the relay house can be created for example, in the location related structure.

Figure 12 – Designation of Objects inside the Relay House

A different view can preferably be selected for the arrangement of the same facility in a container. The fully mounted and installed container is considered to be a product in its own right and is delivered to the plant accordingly. With this, the container housing itself is an element of this product. In this case it makes sense to deal with the complete product container as an independent object in the product structure and to assign a respective reference designation (see also Figure 13).

This has several advantages. The container can be manufactured as a standard product and in doing so the designated future use can be disregarded. The designations in each container are identical. A container can be shifted as desired within the plant without changing the internal reference designations of the container.

As a disadvantage, it cannot be concluded from a reference designation to a certain field. This can be avoided by using additional functional designation or plain text in the documentation.

In principle, the last-mentioned designation can be used also for relay buildings. And vice versa, it is of course possible to use the described designation for relay buildings for container assembly.

Figure 13 – Designation of Objects inside a Container

6.5 Examples of Designations of Objects with Pole Correlation

Objects which are viewed as one unit but consist of partial objects allocated to single poles can be designated e.g. as follows:

Object Combined Reference Single Pole Designation Isolating switch -QB1 -QB1-1 -QB1-2 -QB1-3 Busbar -WA1 -WA1-1 -WA1-2 -WA1-3 Fuses -F1 -F1-1 -F1-2 -F1-3 Current Transformer -BC1 -BC1-1 -BC1-2 -BC1-3

Please note that this sub-categorization does not define an allocation to a phase. This is not a component of the reference designation and must be dealt with as a separate technical attribute (see Chapter 6.6).

6.6 Phase Allocation of Objects

The designation of the phase allocation (in contrast to the pole designation) is not part of the reference designation. It is a treated as a separate technical attribute

Note: The classification of devices for conductors or phases (according to the withdrawn DIN 40719, part 2 by adding e.g. L1, L2, L3 to the device designation) is not possible anymore and is not part of the reference designation (a “phase” is not part of an isolator).

6.7 Examples for the Designation of Isolators with Single Poles or Common Drive

Switching devices in high voltage substations, in particular in air isolated substations, exist in different configurations. Mechanically separated switch units are often delivered one per pole. Nevertheless, these must be regarded as one device unit in use. Figure 14 shows examples of how the components of these combinations can be identified. The respective part-of relation must be complied with. The design constraints are the decisive criterion for the definition of the reference designations.

pole 1 pole 2 pole 3 -QB1 -QB1 -1 -2 -3 -1 pole 1

-2 Pol 2

-3 pole 3

-M1 drive unit

-B1 position switch -M1

common drive

pole 1 pole 2 pole 3 -QB1 -QB1 -1 -2 -3 -1 pole 1

-M1 drive unit

-B1 position switch -2 pole 2 -M1 -M1 -M1 -M1 drive unit

-B1 position switch -3 pole 3

drive per pole -M1 drive unit -B1 position switch

Figure 14 – Examples of the Designation of Isolators in different Constructions.

Examples:

object reference designation Signaling switch in the common motor unit -QB1-M1-B1 Signaling switch in a motor unit per pole -QB1-1-M1-B1

6.8 Examples for the Designation of Busbars in High- and Medium Voltage Substations

The designation of busbars and busbar sections in the product related view depends on the design of the substation. In this case distinguishing between functional arrangement and designation (e.g. busbar 1, section 2) and the product related reference designation is required. The latter relates to design constraints and defines which object of the busbar or a piece of the busbar is a part of. Resulting product related structures are defined by the constructional design (see Figure 15).

Figure 15 – Busbars as Parts of the Product related Structure in various Designs

The following cases can be identified: - in air isolated substations the complete busbar system is to be viewed as a coherent design object, separated by the connected feeders. - In gas isolated substations parts of the busbar are part of the object “feeder”. - In medium voltage substations a coherent unit of the busbar connect several feeders (modular design).

Only in the first case the product related reference can make the functional relation recognizable. This arrangement (shown in Figure 16) can be used for the creation of product related reference designations, for example, for an object “busbar”, consisting of several busbars and several busbar sections. The repetition of the reference letter for the subclass is dispensed with and only the main class and counting number are assigned for the division of the busbars in sections (the separate poles of the busbar are not shown here).

Section 1 Section 2 Section 3

-WA1-W1 -WA1-W2 -WA1-W3 Busbar 1 -WA2-W1 -WA2-W2 -WA2-W3 Busbar 2 -WA3-W1 -WA3-W2 -WA3-W3 Busbar 3 -WA7-W1 -WA7-W2 -WA7-W3 Bypass

Figure 16 – Product related Reference Designation for Busbars and Busbar Section

In all other cases either clear text and/or function related reference designation are mandatory for the identification of functional relationships.

6.9 Designation of Gas Compartments and respective Monitoring Systems in Encapsulated Substations

Gas compartments are mostly comprehensive components, meaning, they are not clearly part of a single object. This means that they are not assigned with a reference designation. To clearly identify them from an operational perspective, gas compartments require alternative clear designations (designation of the monitoring zone). A clear text specification (e.g. gas room 1) or a freely determined key identifier (e.g. GR01 for gas room 1) can be used for this purpose. These designations must be documented in relevant documents, for example, overview circuit figure for gas room monitoring. An example of the relation between components and gas compartments is shown in Figure 17.

Figure 17 – Overlapping Gas Compartment

However, the related monitoring devices can be clearly defined in the product view and therefore receive a unique reference designation.

In many cases a sensor monitors the gas compartments (e.g. density monitor). This sensor is mounted in one of the related plant compartments (e.g. isolator component) and monitors the gas volume of the neighboring compartment too. This sensor is a fixed part of the involved compartment – as delivered ex works – and is not considered as a part of the monitoring gas compartment, see Figure 18. In contrast to the gas compartment, the sensor receives a unique reference designation in relation to the corresponding plant compartment. In this case, an assignment between the sensor and the monitored gas compartment must be documented in functional information text form, for example, “monitoring gas compartment 1” or “monitoring GR01” above the circuit path in the circuit design.

Station -E1 1. switchgear 110 kV -Q01 HV - switchyard 01 -QA1 circuit breaker compartment -Q1 circuit breaker

-BC1

density sensor -BP1 (for CB gas compartment)

isolating / earthing switch -QZ1 compartment -Q1 isolating switch

-Q2 earthing switch

density sensor -BP1 (for gas compartment 01)

-WB1 conductor compartment

density sensor -BP1 (for gas compartment 02)

Figure 18 – Density Sensors in the Compartment

Examples of the designation of density sensors with information in text form:

Reference designation Information in the circuit diagram -E1-Q01-QA1-BP1 Monitoring CB gas compartment -E1-Q01-QZ1-BP1 Monitoring gas compartment 1 -E1-Q01-WB1-BP1 Monitoring gas compartment 2

As another example, the monitoring with contact manometers located in a central gas monitoring cubicle should be regarded. The manometers are connected with gas lines to the corresponding gas compartments. In this case the manometers are part of the gas monitoring cubicle, clearly expressed by the reference designation, see Figure 19. Even in this case, an assignment between the sensor and the monitored gas compartment must be documented with functional information in text form.

station -E1 1. switchgear 110 kV -Q01 HV - switchyard 01 -QA1 circuit breaker compartment -Q1 circuit breaker

-BC1 current transformer

busbar-isolating switch -QB1 compartment -Q1 isolating switch

-P1 gas monitoring cubicle

sensor -PG1 (for gas compartment 01)

sensor -PG2 (for gas compartment 02)

sensor -PG3 (for gas compartment 03)

Figure 19 – contact manometer in feeder of related gas monitoring cubicle

6.10 Information of Reference Designation on Identification Plates

The minimum requirement for information on an identification plate of a product (facilities, facility units, construction units and groups, etc.) is the product related reference designation. If necessary, additional details can be provided for information only. E.g. one or more function related reference designations can be assigned to show in which tasks this product is involved. Additionally, or instead, clear text can be used. The identifying designation must be clearly distinguishable, e.g. another font size or by placing the additional information in brackets (examples see Figure 20).

Relay in control cubicle -K12

Protection cubicle for one feeder, with main- -C1Q01B1 and back up protection Schutz, 380kV-Leitung Adorf =C1Q01F1, =C1Q01F2

Protection cubicle, assigned to several feeders -E1B2 110kV Schutz (=E1Q01, =E1Q02, =E1Q03, =E1Q04)

Figure 20 – Reference Designation on Iidentification Plates

The reference designation on identification plates may be separated in the arrangement if the relation is clearly visible (see Figure 21).

-E1-Q01-S1

-K1

-A1

-K1

-A2

-K1

-A3

-K1

-A4

-X1

Figure 21 – Separated Reference Designation

E.g. complete reference designation of:

the cubicle -E1-Q01-S1 the first frame in the cubicle -E1-Q01-S1-A1 the first control device in the first frame -E1-Q01-S1-A1-K1 the first terminal block in the cubicle -E1-Q01-S1-X1

The same logic is used for the identification plates of locations.

6.11 Use of Reference Designation in Documents

There are two basic distinctions for the use of reference designations in documents: - the designation of viewed objects; - the designation of documents. Both designations are always independent of each other and may not be linked (see IEC 61355).

The document type determines the respective selection of object view. For example, the circuit diagram shows mainly products (devices, construction units, etc.) and their connections. As described above, the product related reference designation distinctively determines the object. Therefore, it should be placed near the respective symbol in the circuit diagram. This creates distinctive assignment between the presentation in the document and the presence in the plant (identification plate). The circuit diagram itself can in turn describe a complete function or a part of a function. In this case it is useful to associate the circuit diagram to this function. The function related reference designation can be used as a part of the document designation for this purpose. If the circuit diagram describes precisely one product, e.g. a control cubicle, it can be assigned to the control cubicle with the product related reference designation. Further information can be found in Part 2 of the IG EVU-script “Designation and Order of

Documentation” in accordance With IEC 61355”.

6.12 Relationship between Reference Designations under various Aspects

Reference designations are the foundation for systematic information collection, evaluation and recovery. In accordance with IEC 81346-1 a product can realize one or more functions. Each function can in turn be realized by one or more products.

Often several objects work together to fulfill one function. For example, the function “current measuring” is not only realized with the product “current transformer”. This occurs by the interaction of components such as “current transformer”, “measuring transducer”, “wiring “/ ”cable”, “terminals” and “measuring device”.

One particular unit is often involved in the realization of several functions, for example a combined control- and protection device. In this case, the object “unit” can be associated with several functions, whereby each refers to the relevant object in the function related structure.

From the perspective of data technology each product “knows” which function it participates in. Vice versa each functional object “recognizes” all products participating in its realization. The mutual references are created by the respective reference designations which are generated for example in a data base. They can be created as a reference designation set (see Chapter 5.8) in documents if the links are not too extensive. This procedure results in a network of relations amongst the objects (see Figure 22).

Product A Product B Product C

Function Function Function Function Function Function 1 2 3 4 5 6

Figure 22 – Relations between Product- and Functional Objects

This also applies to reference designation in the location view showing which location an object is placed or installed at. In this case, several locations can possibly be relevant, for example, a cable passing through several locations.

In general the following relations shall apply and are documented by the use of the respective reference designation: - A product can realize one or more functions. - A function can be realized by one or more products. - A product can extend to one or more locations. - A location can include one or more products

The function “automatic parallel operation” is shown here as an example of the relation between objects. In this case a circuit breaker closes automatically based on the comparison of two measurements but without actively influencing any of these measurements. The views are based on the function related structure shown in Chapter 5.5.

Please – again - note, that the function is described independently from the realization. There is no indication whether a central or decentralized solution is used.

The function “automatic parallel operation” is feeder related and an element of part function “power switching – control”. Therefore, it is not necessary to create a new object in the function related structure. In fact, information concerning the automatic parallel operation can be directly assigned to the existing objects in the structure tree. The reference designation of these objects (e.g. in the second station 380 kV) are: =C2=Q01=QA1=S1; =C2=Q02=QA1=S1, etc.

Now, these functions must be realized. For example, a centralized solution is selected. One parallel switching device is used per station (in this case: 2nd Station 380kV). This device is defined as a unit in the product related structure and receives the relevant reference designation (see Chapter 5.4): -C2-K2 The following relations can be confirmed: The object with the reference designation –C2-K2 realizes the functions =C2=Q01=QA1=S1; =C2=Q02=QA1=S1, etc. alone or with other objects (the latter applies; however these objects aren’t designated).

Vice versa the following relations exist: The function =C2=Q01=QA1=S1 is realized completely or partly (in this case the latter applies) with the object –C2-K2.

The function =C2=Q02=QA1=S1 is realized completely or partly (in this case the latter applies) with the same object –C2-K2 too, as well as the respective functions of the remaining feeders.

The consistent application of the reference designation allows an unprecedented extent of selective representation of object relations and also information analysis.

7.1 General

There are two classification principles available for the classification of objects in accordance with IEC 81346-2: - Classification according to purpose or task of objects (see Chapter 7.2 and 7.3) - Classification of infrastructure objects (see Chapter 7.4 and 7.5)

The objects in electrical energy transmission and distribution stations are classified according to the following specifications (see also Figure 5):

The classification according to purpose or task (Table 1 and Table 2) is used for all objects in all hierarchy levels.

The station view of the first level is an exception. Objects of the first level (infrastructure objects) are exclusively classified according to Table 3 and Table 4.

7.2 Table 1 - Classes of Objects according Purpose or Task

The IEC 81346-2, Table 1 must be used for classification of objects according to purpose or task and for the respective selection of code letters. The following Table 1 indicates equal classes, whereby the examples are partly adapted to the area of application.

The following method is used to allocate classified key letters (purpose or task of the objects) to objects: - An object with only one purpose or only one task is classified in accordance with this purpose or task. - An object with several purposes or tasks is classified in accordance with its main purpose or main task if it can be identified. - An object with several purposes or tasks for which a main purpose or main task can’t be identified is classified with the key letter “A”.

Note: The allocation of the key letters to the objects according to Table 1 is similar to that according to the withdrawn DIN 40719-2 (IEC 750), but not identical. Other key letters are used instead those used previously because of the universal classification according to purpose or task and, in addition, because other disciplines like mechanical engineering or civil engineering also use the same classification. (Example: current-/voltage transformer B instead of T, protection devices B instead of F, because both devices have the task to convert an input variable into a signal for further processing).

Table 1 - Classification of Objects according Purpose or Task and Examples for Functions and Products code Intended purpose or task of Examples of terms describing Examples of typical components object the intended purpose or the (in accordance with IEC task of objects 81346-2)

A Two or more purposes or tasks Combined field control- / protection device NOTE: This class is only for objects for which no main sensor screen intended purpose or task can be identified

B Converting an input variable Detecting Auxiliary switch (as position indicator) (physical property, condition or Sensing Buchholz relay event) into a signal for further Recording Measurements Current transformer processing Monitoring Differential protection relays Distance protection relays Flame detector Gas detector Limit switch Measuring element Measuring relay Measuring shunt (resistance) Microphone Detector Movement detector Optical current transformer Optical voltage transformer Over-current protection relay Overload relay Photocell Position switch Protection relay Protection cubicle Proximity sensor Proximity switch Safety cabinet Sensor Smoke sensor Temperature sensor Video camera Voltage transformer C Storing of energy, information Recording Buffer battery or material storage Capacitor Event recorder (mainly for storage purposes) Hard disk Magnetic tape recorder (mainly for storage purposes) Memory RAM Storage battery Video recorder (mainly for storage purposes) Voltage recorder (mainly for storage purposes) Water tank D Reserved for future standardization

E Supply of radiant or thermal Cooling Boiler energy Heating Electrical heater Lighting Heater Lamp Radiating Laser Luminaire

IG EVU-001E: Designation and documentation – Part 1 English translation. 2019-09-18 © IG EVU 2005 – copyright – all rights reserved - 38 - code Intended purpose or task of Examples of terms describing Examples of typical components object the intended purpose or the (in accordance with IEC task of objects 81346-2)

F Direct protection (self-acting) Absorbing Fuse of a flow of energy, signals, Guarding Guard personnel or equipment from Preventing Miniature circuit-breaker dangerous or unwanted Protecting Oil extension vessel conditions Securing Overvoltage limiter Including systems and Shielding Rupture disc equipment for protective Safety valve purposes Shielding Protection devices see code B. Surge arrester Thermal overload release

G Initiating a flow of energy or Generating Dry cell battery material Fan or Fuel cell Generating signals used as Generator information carriers or Pump reference source Signal generator Solar cell H Producing a new kind of Assembling Centrifuge material or product Crushing Mill Disassembling Mixer Fractionating Separator Material removing Milling Mixing Producing Pulverizing I Not to be applied ------J Reserved for future standardization

K Processing (receiving, treating Closing (of control circuits) All-or-nothing relay and providing) signals or Continuous controlling Automation device information Delaying Auxiliary relay (excluding objects for Opening (of control circuits) Blocking device protective purposes, see Switching (of control circuits) Computer Class B or F) Synchronizing Contactor relay Control device Control panel Control valve Controller CPU Delay device Field control device Filter Filter Interlocking device Optical coupler Switching fault protection device Synchronizing device Time relay Transistor Trip relay Voltage controller L Reserved for future standardization

M Providing mechanical energy Actuating Actuating coil (rotational or linear mechanical Driving Actuator motion) for driving purposes Electric motor Linear motor N Reserved for future standardization

O Not to be applied ------

IG EVU-001E: Designation and documentation – Part 1 English translation. 2019-09-18 © IG EVU 2005 – copyright – all rights reserved - 39 - code Intended purpose or task of Examples of terms describing Examples of typical components object the intended purpose or the (in accordance with IEC task of objects 81346-2)

P Presenting information Alarming Bell Communicating Clock Displaying Current measuring device Indicating Event counter Informing Horn Measuring (presentation of variables) Indicator Presenting Loudspeaker Printing Mechanical drop indicator relay Warning Meter cabinet Monitor Power factor indicator Printer Reactive power meter Signal lamp Status panel Switching cycle counter Synchroscope Text display Temperature gauge Voltmeter Watt-hour meter Wattmeter Q Controlled switching or varying Opening (of energy, signals and Circuit-breaker a flow of energy, of signals material flow) Contactor (for power) Closing (of energy, signals and Disconnector (for signals in control circuits, material flow) Earthing switch see Classes K and S) or of Switching (of energy, signals and Fuse switch (if main purpose is material material flow) protection, see Class F) Clutching Fuse-switch-disconnector (if main purpose is protection, see Class F) Load-break switch Motor protection switch Motor starter Power transistor Switchyard Thyristor R Restricting or stabilizing Blocking Diode motion or a flow of Damping Inductor energy, information or Restricting Limiter material Limiting Resistor Stabilizing Zener diode S Converting a manual operation Influencing Control cabinet (control and operate) into a signal for further Manually controlling Control panel (operate) processing Selecting Control switch Cordless mouse Discrepancy switch Keyboard Light pen Push-button switch Push-button valve Selector switch Set-point adjuster

IG EVU-001E: Designation and documentation – Part 1 English translation. 2019-09-18 © IG EVU 2005 – copyright – all rights reserved - 40 - code Intended purpose or task of Examples of terms describing Examples of typical components object the intended purpose or the (in accordance with IEC task of objects 81346-2)

T Conversion of energy Amplifying Antenna maintaining the type of energy Modulating Amplifier Transforming Charger Frequency convertor Conversion of an established Casting Interposing transformer signal maintaining the content of information Compressing Inverter Converting Power supply Cutting Power transformer Conversion of the form or Material deforming Rectifier shape of a material Expanding Signal converter Forging Test-value transmitter Grinding Transducer Rolling Transformer Size enlargement Size reduction Turning U Keeping objects in a defined Bearing Assembly plate position Carrying Assembly rail Holding Bearings Supporting Bracket Building foundation Cabinet Cable duct Cable framework Cable tray Container Fixture Gateway Insulator Pipe bridge Pole Roller bearing Room

V Processing (treating) of Coating Separator material or products (including Cleaning Filter preparatory and post- Dehydrating Insulator-cleaner Derusting treatment) Oil-processing plant Drying Filtering Heat treatment Packing Preconditioning Recovering Re-finishing Sealing Separating Sorting Stirring Surface treatment Wrapping W Guiding or transporting energy, Distributing Busbar signals, material or products Guiding Bushing from one place to another Leading Cable Positioning Conductor Transporting Crane Data bus Oil-pipeline Optical fiber Pipe Sub-distribution board

IG EVU-001E: Designation and documentation – Part 1 English translation. 2019-09-18 © IG EVU 2005 – copyright – all rights reserved - 41 - code Intended purpose or task of Examples of terms describing Examples of typical components object the intended purpose or the (in accordance with IEC task of objects 81346-2)

X Connecting objects Connecting Connector Coupling Converter-terminal box Joining Marshalling racks Piping flange Plug connector Socket Terminal Terminal block Terminal strip Y Reserved for future standardization

Z Reserved for future standardization

7.3 Table 2 – Subclasses for Classes according to Table 1

If necessary, subclasses can be used - together with the classes according to Table 1 - for distinguishing similar objects. IEC 81346-2 specifies determinations for subclasses. This IG EVU – script shows these subclasses in Table 2. The subclasses are only indicated in the examples if the distinction is relevant because their application is optional. If control cable connectors and fiber optical cable connectors are present in a unit then it’s advisable to classify the first one with XG and the second one with XH to make a distinction. The sub classification of IEC 81346 is based on a general classification of the key letters into the following groups (with exception of class B, see comment in Table 2):

- sub class A…E for objects with regard to electrical energy - sub class F…K for objects with regard to information and signals - sub class L…Y for objects with regard to mechanical, constructional technology, etc. (non-electrical technology) - sub class Z for objects with regard to combined tasks (sub classes A…Y)

The reference designation in accordance with IEC 81346 does not assign fixed functions to numbers. The numbers define objects which belong to the same class and subclass.

Concerning feeder subclasses it’s useful and advisable (for example for the classification of main switching devices and transformers) to retain defined numbers for the purpose of - document recovery (copy of existing solutions), - of object recognition (equal reference designation for equal switch- or transformer tasks) and - of standardization.

See Appendix A for examples.

Table 2 – Definition and Key Letters of Subclasses in relation to Main Classes according to Table 1

Main class A: Two or more purposes or tasks

Code Definition of subclass Examples of components AA … AE Objects related to electrical energy (free for definition by the user)

AF … AK Objects related to information and signals (free for definition by the user)

AL … AY Objects related to process, mechanical and civil engineering (free for definition by the user)

AZ Combined tasks

NOTE: Main class A is only for objects for which no main intended purpose or task can be identified.

Table 2 - (continued)

Main class B Converting an input variable (physical property, condition or event) into a signal for further processing Definition of subclass Code Examples of components based on input measured variable BA Electrical potential Measuring relay (voltage), measuring shunt (voltage), measuring transformer (voltage), protection relay (voltage), voltage transformer BB Not used BC Electrical current Current transformer, measuring relay (current), measuring transformer (current), protection relay (current), overload relay (current) (Shunt) BD Density BE Other electrical or electromagnetic variable Measuring relay, measuring shunt (resistance), measuring transformer, protection relay BF Flow Flow meter, gas meter, water meter BG Gauge, position, length Motion sensor, movement detector, (including distance, elongation, amplitude) position switch, proximity switch, proximity sensor BH Not used BJ Power BK Time Clock, time counter BL Level Level sensor BM Moisture, Humidity Humidity meter BN Not used BP Pressure, Vacuum Pressure gauge, pressure sensor BQ Quality Gas analyzer, x-ray machine (composition, concentration, purity, material property) BR Radiation Flame detector, smoke detector BS Speed, frequency Accelerometer, speedometer, (including acceleration) tachometer, vibration pickup BT Temperature Temperature sensor, temperature monitor BU Multi-variable Buchholz relay, protection cubicle BV Not used BW Weight, Force Load cell BX Other quantities Microphone, video camera BY Not used BZ Number of events, counts, combined tasks Switching cycle detector, combined instrument transformer Note: The letter codes in accordance with 7.3.1 of ISO 14617-6:2002 are used for the subclasses together with some additions required for the purpose of this standard. Descriptions of letter codes BA, BC, BV and BX have been added. The letter code BZ is additionally made available for “combined tasks” which allows it to be in line with the other main classes.

Table 2 - (continued)

Main class C Storing of energy, information or material Definition of subclass based on kind of Code Examples of components storage

CA Capacitive storage of electric energy Capacitor CB Inductive storage of electric energy Coil, Superconductor CC Chemical storage of electric energy Buffer battery NOTE Batteries seen as energy sources are assigned to main Class G CD … CE Not used ---

CF Storage of information CD-ROM, EPROM, event recorder, hard disk, magnetic tape recorder, memory, RAM, video recorder, voltage recorder CG … CK Not used ---

CL Open storage of material at fixed location Bunker, cistern, paper reel stand, pit, (collection, housing) pool CM Closed storage of material at fixed location Accumulator, barrel, boiler, buffer, (collection, housing) container, depository, flash tank, gas holder, safe, silo, tank CN Moveable storage of material (collection, housing) Container, transportation containers, gas cylinder, shipping container CP Storage of thermal energy Hot water accumulator, hybrid heat storage, ice tank, steam storage, thermal energy storage, underground thermal energy storage CQ Storage of mechanical energy Flywheel, rubber band CR … CY Not used ---

CZ Combined tasks

Table 2 - (continued)

Main class E: Providing radiant or thermal energy

Definition of subclass based on generated Code Examples of components output and method for generation

EA Generation of electromagnetic radiation for Fluorescent lamp, fluorescent tube, lighting purposes using electrical energy incandescent lamp, lamp, lamp bulb, laser, LED lamp, maser, UV radiator EB Generation of heat by conversion of electrical Electrical boiler, electrical furnace, energy electrical heater, electrical radiator, electrode steam boiler, heating rod, heating wire, infrared heating element EC Generation of cooling energy by conversion of Compression chiller, cooling unit, electrical energy freezer, freezing unit, Peltier element, refrigerator, turbine-driven chiller ED Not used --- EE Generation of other electromagnetic radiation by means of electrical energy

EF Generation of electromagnetic radiation for signaling purposes EG … EK Not used ---

EL Generation of electromagnetic radiation for Gas light, gas lamp lighting purposes by combustion of fossil fuels EM Generation of heat by conversion of chemical Boiler, burner, combustion grate, furnace energy EN Generation of cooling energy by conversion of Cold pump, refrigerator chemical energy EP Generation of heat by convection Boiler, condenser, evaporator, economizer, feed water heater, heat exchanger, heat recovery steam generator, radiator, steam generator EQ Generation of cooling energy by convection Cold pump, freezer, refrigerator ER Generation of heat by conversion of mechanical energy ES Generation of cooling energy by conversion of Mechanical refrigerator mechanical energy ET Generation of heat by nuclear fission Nuclear reactor EU Generation of particle radiation Neutron generator EV … EY Not used ---

EZ Combined tasks

Table 2 - (continued)

Main class F Direct protection (self-acting) of a flow of energy, signals, personnel or equipment from dangerous or unwanted conditions, including systems and equipment for protective purposes Definition of subclass based on kind of Code Examples of components phenomenon to protect against

FA Protection against overvoltage Arrester, surge arrester FB Protection against residual current Residual current device FC Protection against overcurrent Fuse, fuse unit, miniature circuit-breaker, thermal overload release FD Not used --- FE Protection against other electrical hazards Enclosure for electromagnetic shielding, Faraday cage

FF … FK Not used ---

FL Protection against hazardous pressure condition Automatic drains trap, rupture disc, safety valve, vacuum breaker FM Protection against effects of fire Fire damper, fire protection door, fire protection facility, lock FN Protection against hazardous operating condition Impact protection, protection device, or damage protective shield, protective sleeve for thermocouple, safety clutch FP Protection against hazardous emission Reactor protection equipment (E.g. radiation, chemical emissions, noise) FQ Protection against hazards or unwanted situations Airbag, barriers, contact protection, for person or animals escape door, escape window, fence, (e.g. safeguarding) gates, glare protection, guard, vision protection, railing, safety belt FR Protection of mechanical and building technology Cathodic protection anode products and systems against wear (e.g. corrosion) FS Protection against environmental effects Avalanche protection device, geophysical (e.g. weather, geophysical effects) protection device, weather protection device FT … FY ------

FZ Combined tasks

Table 2 - (continued)

Main class G Initiating a flow of energy or material Generating signals used as information carriers or reference source Definition of subclass based on kind of Code Examples of components initiation and kind of flow GA Initiation of an electrical energy flow by use of Dynamo, generator, motor-generator set, mechanical energy power generator, rotating generator GB Initiation of an electrical energy flow by chemical Battery, dry cell battery, fuel cell conversion GC Initiation of an electrical energy flow using light Solar cell GD … GE Not used ---

GF Generation of signals as an information carrier Signal generator, transducer GG … GK Not used ---

GL Initiation of a continuous flow of solid matter Belt, chain conveyor, distributor GM Initiation of a discontinuous flow of solid matter Crane, elevators, forklift, lifting gear, manipulator, lifting device GN Not used GP Initiation of a flow of liquid or flowing substances Pump, screw conveyor driven by an energy supply GQ Initiation of a flow of gaseous substances by a Aspirator, blower, compressor, fan, mechanical driver vacuum pump, ventilator GR Not used GS Initiation of a flow of liquid or gaseous substances Ejector, injector, jet by driving medium GT Initiation of a flow of liquid or gaseous substances Lubricator, oiler by gravity GU … GY Not used ---

GZ Combined tasks

Table 2 - (continued)

Main class H Producing a new kind of material or product Definition of subclass based on method Code Examples of components applied to produce material or product HA … HE Not used ---

HF … HK Not used ---

HL Generation of a new product by assembling Assembly robot, component insertion machine HM Separation of mixtures of substances by Centrifuge, cyclone device centrifugal force HN Separation of mixtures of substances by gravity Separator, settling tank, vibrator HP Separation of mixtures of substances by thermal Distillation column, drying (Munters air processes dryer), extraction system HQ Separation of mixtures of substances by filtering Fluid filter, gas filter, grate, rake, screen or classification HR Separation of mixtures of substances by Electrostatic precipitator, magnetic electrostatic or magnetic forces separator HS Separation of mixtures of substances by physical Absorption washer, active charcoal processes absorber, ion exchanger, wet ash scrubber HT Generation of new gaseous substances Gasifier HU Generation of new form of solid material by Crusher, mill crushing HV Generation of new form of solid material by Briquette maker, pellet maker, sintering coarsening facility, tablet maker HW Generation of new substances by mixing Emulsifier, humidifier (steam), kneader, mixer, mixing vessel, static mixer, stirrer HX Generation of new substances by chemical Reaction furnace, reactor reaction HY Generation of new substances by biological Composter, fermenter reaction

HZ Combined tasks

Table 2 - (continued)

Main class K Processing (receiving, treating and providing) signals or information (excluding objects for protective purposes, see Class F) Definition of subclass based on kind of Code Examples of components signals to be processed KA … KE Not used ---

KF Processing of electrical and electronic signals All-or-nothing relay, analogue integrated circuit, automatic paralleling device, binary elements, binary integrated circuit, contactor relay, CPU, delay element, delay line, electronic valve, electronic tube, feedback controller, filter (AC or DC), induction stirrer, input/output module, microprocessor, opto-coupler, process computer, programmable controller, receiver, safety logic module, synchronizing device, time relay, transistor, transmitter KG Processing of optical and acoustical signals Mirror, controller, test unit KH Processing of fluid and pneumatic signals Controller (valve position controller), fluid feedback controller, pilot valve, valve assembly KJ Processing of mechanical signals Controller, linkage KK Processing of various input/output information Controller, electro-hydraulic converter, carriers (e.g. electrical/pneumatic) electric pilot valve

KL … KY Not used ---

KZ Combined tasks

Table 2 - (continued)

Main class M Providing mechanical energy (rotational or linear mechanical motion) for driving purposes Definition of subclass based on kind of Code Examples of components driving force MA Driving by electromagnetic force Electric motor, linear motor MB Driving by magnetic force Actuating coil, actuator, electromagnet, magnetic drive MC … ME Not used ---

MF … MK Not used ---

ML Driving by mechanical force Friction wheel drive, mechanical actuator, spring force, stored-energy spring actuator, weight MM Driving by hydraulic or pneumatic force Fluid actuator, fluid cylinder, fluid motor, hydraulic cylinder, servomotor MN Driving by steam flow force Steam turbine MP Driving by gas flow force Gas turbine MQ Driving by wind force Wind turbine MR Driving by fluid flow force Hydraulic turbine MS Driving by force using chemical conversion means Combustion engine MT … MY Not used ---

MZ Combined tasks

Table 2 - (continued)

Main class P Presenting information Definition of subclass based on kind of Code presented information and presentation Examples of components medium PA … PE Not used ---

PF Visible presentation of discrete states LED, mechanical drop indicator, signal lamp PG Visible presentation of values of discrete variables Ammeter, barometer, clock, counter, event counter, flow meter, frequency meter, Geiger counter, manometer, sight glass, synchroscope, thermometer, voltmeter, watt-hour meter, wattmeter, weight display PH Visible presentation of information in drawing, Analogue recorder, barcode printer, pictorial and/or textual form event recorder (mainly for presenting information), printer, recording voltmeter, text display, video screen PJ Audible presentation of information Bell, horn, loudspeaker, whistle PK Tactile presentation of information Vibrator

PL … PY Not used ---

PZ Combined tasks

Table 2 - (continued)

Main class Q Controlled switching or varying a flow of energy, of signals or of material Definition of subclass based on purpose of Code Examples of components switching or variation QA Switching and variation of electrical energy Circuit-breaker, contactor, motor starter, circuits power transistor, thyristor

QB Isolation of electrical energy circuits Disconnector, fuse switch, fuse-switch disconnector, isolating switch, load-break switch QC Earthing of electrical energy circuits Earthing switch QD … QE Not used ---

QF … QK Not used ---

QL Braking Brake QM Switching of flow of liquid substances in closed Blank, blanking plate, damper, shutoff enclosures valve (including drain valve), solenoid valve QN Varying of flow of liquid substances in closed Control damper, control valve, gas enclosure control path QP Switching or varying of flow of liquid substances Dam plate, lock gate in open enclosures QQ Providing access to an area Bar (lock), cover, door, gate, lock, turnstile, window QR Shut-off of flow of liquid substances (no valves) Isolation device, rotary lock (open/close) QS … QY Not used ---

QZ Combined tasks

Note: Main class Q applies for the classification of entire switch switchyards. Subclasses are not necessary. Switchyards are distinguished by code numbers (see Chapter 7.3 and Table A.1 for examples of code numbers). Examples: Switchgear: Switch tasks: -QA1 1. Circuit breaker =QA1 switching -QA2 2. Circuit breaker =QB1 disconnecting -QB1 1. Disconnect switch =QC1 earthing -QB2 2. Disconnect switch -QC1 1. Earthing switch -QC2 2. Earthing switch -QZ1 1. Combination switch

Table 2 - (continued)

Main class R Restricting or stabilizing motion or a flow of energy, information or material Definition of subclass Code Examples of components based on the purpose of the restriction RA Limiting a flow of electrical energy Arc-suppressing reactor, diode, inductor, limiter, resistor RB Stabilizing a flow of electrical energy Uninterruptible power supply (UPS) RC … RE Not used

RF Stabilizing a signal Equalizer, filter, low pass RG … RK Not used ---

RL Restricting an unauthorized operation and/or Blocking device, latch, lock, stop movement (mechanical) RM Restricting a return flow of gaseous, liquid and Check valve flowing substances RN Restricting a flow of liquid and gaseous Flow restrictor, orifice plate, Venturi substances nozzle, water-proof seal RP Restricting an emission of sound Noise protection, sound absorber RQ Restricting a thermal flow Insulation, jacket, lagging, lining, thermal insulation louver damper RR Restricting a mechanical effect Brick lining, compensator, shock absorber, vibration absorption RS Restricting a chemical effect Brick lining, explosion protection, gas penetration protection, splash protection RT Restricting an emission of light Blind, screen, shutter RU Restricting access to an area Fence RV … RY Not used

RZ Combined tasks

Table 2 - (continued)

Main class S Converting a manual operation into a signal for further processing Definition of subclass Code Examples of components based on kind of output signal carrier SA … SE Not used ---

SF Providing an electrical signal Control switch, discrepancy switch, keyboard, light pen, pushbutton switch, selector switch, set-point adjuster, switch SG Providing an electromagnetic, optical or acoustical Cordless mouse signal SH Providing a mechanical signal Hand wheel, selector switch SJ Providing a fluid or pneumatic signal Push-button valve SK Not used ---

SL … SY Not used ---

SZ Combined tasks

Table 2 - (continued)

Main class T Conversion of energy maintaining the type of energy Conversion of an established signal maintaining the content of information Conversion of the form or shape of a material Definition of subclass Code Examples of components based on kind of transformation/conversion TA Converting electrical energy while retaining the DC/DC converter, frequency converter, energy type and energy form power transformer, transformer TB Converting electrical energy while retaining the Inverter, rectifier energy type and changing the energy form TC … TE Not used ---

TF Converting signals (retention of information Aerial, amplifier, electrical transducer, content) impulse amplifier, isolating converter, signal converter TG … TK Not used ---

TL Converting speed of rotation, torque, force into Automatic gear, control coupling, the same kind fluid amplifier, indexing gear, pressure amplifier, speed convertor, torque converter TM Converting a mechanical form with a machine Machine tool, saw, shear TN Not used --- TP Converting a mechanical form by cold forming Cold drawing equipment, cold rolling (chipless deforming) equipment, deep drawing equipment TQ Converting a mechanical form by hot forming Casting machine, extruder, forging, (chipless deforming) hot drawing equipment, hot rolling TR Converting radiation energy while retaining energy Magnifying glass, parabolic mirror form TS … TY Not used ---

TZ Combined tasks

Examples: Devices: Tasks: -TA1 1. Power transformer =TA1 Transformation 220 kV/110 kV -TF1 1. Signal converter =TF1 Boosts the signal

Table 2 - (continued)

Main class U Keeping objects in a defined position Definition of subclass Code based on kind of object to be kept in a Examples of components position UA Holding and supporting electrical energy Insulator, supporting structure, equipment transformer foundation UB Holding and supporting electrical energy cables Cable duct, cable rack, cable tray, cable and conductors trough, insulator, mast, portal, post insulator UC Enclosing and supporting electrical energy Cubicle, encapsulation, housing equipment UD … UE Not used ---

UF Holding and supporting instruments, control and Printed circuit board, sub-rack, communication equipment transducer rack UG Holding and supporting instruments, control and Cable rack, duct, shaft communication cables and conductors UH Enclosing and supporting instrumentation, control Cabinet, cubicle, enclosures and communication equipment UJ … UK Not used ---

UL Holding and supporting machinery Machine foundation UM Holding and supporting structural objects Building foundation, duct (not cable duct, see UG), shaft, structural elements (e.g. column, joist, lintel, suspender beam) UN Holding and supporting piping objects Bracket for pipes, pipe bridge, pipe hanger UP Holding and guiding of shafts and rotors Ball bearing, roller bearing, sliding bearing UQ Holding and guiding objects for manufacturing or Centring device, clamping, fixture erection UR Fastening and anchoring machinery Anchor plate, bracket, carrier, erection frame, erection plate US Spatial objects, housing and supporting other Corridor, duct, hall, passage, room, objects shaft, stairwell UT … UY Not used ---

UZ Combined tasks

Table 2 - (continued)

Main class V Processing (treating) of material or products (including preparatory and post-treatment) Definition of subclass based on kind of Code Examples of components processing VA … VE Not used ---

VF … VK Not used ---

VL Filling material Drum, sack, tank car filling equipment VM Packaging product Packaging machine, palletizer, wrapping machines VN Treating surface Burnisher, grinding, painting machine, polishing machine VP Treating material or product Annealing furnace, balancing machine, blast furnace, melting furnace VQ Cleaning material, product or facility Building cleaning equipment, vacuum cleaner, washing machine, VR … VY ------

VZ Combined tasks

Table 2 - (continued)

Main class W Guiding or transporting energy, signals, material or products from one place to another Definition of subclass based on Code characteristics of energy, signal, material or Examples of components product to be conducted or routed WA Distributing high voltage electrical energy Busbar (> 1 000 V AC or > 1 500 V DC.) WB Transporting high voltage electrical energy Bushing, cable, conductor (> 1 000 V AC or > 1 500 V DC.) WC Distributing low voltage electrical energy Busbar, motor control center, switchgear (≤ 1 000 V AC or ≤ 1 500 V DC) assembly WD Transporting low voltage electrical energy Bushing, cable, conductor (≤ 1 000 V AC or ≤ 1 500 V DC) WE Conducting earth potential or reference potential Bonding conductor, earthing busbar, earthing conductor, earth rod, shield bus

WF Distributing electrical or electronic signal Data bus, field bus WG Transporting electrical or electronic signal Control cable, data line, measuring cable WH Transporting and routing optical signal Optical fiber, optical fiber cable, optical wave guide WJ … WK Not used ---

WL Transporting material or product (not driven) Conductor, inclined plane, roller table WM Conducting or guiding flow of substance in open Channel enclosure WN Conducting or guiding flow of substance in Hose flexible, closed enclosure WP Conducting or guiding flow of substance in rigid, Air duct, pipe, stack closed enclosure WQ Transporting mechanical energy Chain, linkage, rotor, shaft, V-belt WR Conducting or guiding track-bound transport Points, rails, railway, turntable equipment WS Conducting or guiding persons Catwalk, platform, stair (access equipment) WT Conducting or guiding mobile transport equipment Path, road, shipping routes WU … W Y Not used ---

WZ Combined tasks

Examples: -WA1 1. Busbar See Annex A for examples and recommendations -WE1 1. Earthing bar regarding the classification of busbars in high voltage switchgears. -WG1 1. Control cable

Table 2 - (continued)

Main class X Connecting objects Definition of subclass based on Code characteristics of energy, signal, material or Examples of components component to be connected XA Not used --- XB Connecting high voltage objects Terminal, junction box, socket, bushing, (> 1 000 V AC or > 1 500 V DC) cable sealing box XC Not used --- XD Connecting low voltage objects Connector, junction box, plug connector, (≤ 1 000 V AC or ≤ 1 500 V DC) socket-outlet, terminal, terminal block, terminal strip, cable sealing box XE Connecting to earth potential or reference Bonding terminal, earthing terminal, potential shield connection terminal

XF Connecting data network carriers Hub XG Connecting data network carriers Connection element, plug connector, signal distributor, terminal, terminal block XH Connecting optical signal carriers Optical connection XJ … XK Not used ---

XL Connecting rigid enclosures for flows of Piping fitting, piping flange, piping substances coupling XM Connecting flexible enclosures for flows of Hose connection, hose coupling substances XN Connecting objects for transport of mechanical Rigid coupling energy, non-detachable XP Connecting objects for transport of mechanical Control coupling, disengaging coupling energy, detachable XQ Connecting irreversible connected objects Bonded connection, soldered connection, welded connection XR Connecting reversible connected objects Hook, lug XS … XY Not used ---

XZ Combined tasks

Examples: -XB1 1. HV-clamp -XG1 1. Socket for control cable

7.4 Table 3: Classification of Infrastructure Objects

IEC 81346-2 defines a framework for classification of infrastructure objects. Table 3 shows the technical specification for the application range of energy transmission and distribution regarding the classes B to U.

Table 3 - Classification of Infrastructure Objects

Code Object class definition Examples sub class

A Objects for overall management of other Supervisory control system Tab. 1 infrastructure objects Remote control units applicable Cable unit (top station level, comprises single cable, classified in the second Objects for Objects structure level with W in Table 1) common tasks common

B Installations with Un > 420 kV Tab. 4

C Installations with 380 kV ≤ Un ≤ 420 kV --

D Installations with 220 kV ≤ Un < 380 kV Tab. 4

E Installations with 110 kV ≤ Un < 220 kV Tab. 4

F Installations with 60 kV ≤ Un < 110 kV --

G Installations with 45 kV ≤ Un < 60 kV --

H Installations with 30 kV ≤ Un < 45 kV --

J Installations with 20 kV ≤ Un < 30 kV --

K Installations with 10 kV ≤ Un < 20 kV --

L Installations with 6 kV ≤ Un < 10 kV --

M Installations with 1 kV ≤ Un < 6 kV -- Objects for main-process facilities for Objects N Installations with Un < 1 kV Auxiliary power system Tab. 4 P Objects for potential equalization Earthing system -- Lightning protection system Q, R, S --- -- T Transformer plants --

U --- -- V Objects for storage of material or goods Fresh-water tank plant -- Firewater tank Spare parts store W Objects for administrative or social Garage -- purposes or tasks Office Sanitary facilities X Objects for fulfilling auxiliary purposes or Air conditioning system Tab. 4 tasks Alarm system Crane-system Electric power distribution Fire protection system Gas-supply Lighting installation Security system Sewage disposal plant Water-supply Y Objects for communication and information Computer network -- tasks Loudspeaker system

Objects not related to the related the not to main process Objects Telephone system Video surveillance system Antenna system Z Objects for housing or enclosing technical Building -- systems or installations such as areas and Aera buildings Fence Railway line Road

7.5 Table 4: Subclasses for particular Classes according to Table 3

IEC 81346-2 does not define subclasses for infrastructure objects. The subclasses in Table 4 are optional and must be used exclusively in connection with Table 3 in reference to infrastructure objects within the application range energy transmission and distribution. These are recommendations only and should be adjusted or further defined accordingly.

The definition of subclasses for voltage ranges takes standard voltages in accordance with IEC 60038 into account if it is relevant for this classification. The standard classification within the voltage range of >1 kV is defined by the main classification. A sub-classification can be used if necessary.

Example: A station has a 110-kV plant and additionally a plant with a rated voltage of 150 kV (e.g. to connect with an offshore wind power plant). The 110-kV plant is defined classification E. The 150-kV plant should receive a different classification. The plant can be classified EC according to Table 4 and the 110-kV plant can retain the classification E.

Table 4: Subclasses for Infrastructure Objects according to Table 3

Table 4 a)

Infrastructure objects, Class B acc. to Table 3

Installations with Un > 420 kV

Code Definition of subclass based on voltage range

BA Un ≥ 1000 kV

BC 765 kV ≤ Un < 1000 kV

BE 525 kV ≤ Un < 765 kV

BG 420 kV ≤ Un < 525 kV BH

BJ … BY BZ Combined voltage range

Table 4 b)

Infrastructure objects, Class D acc. to Table 3 Installations with 220 kV ≤ Un < 380 kV

Code Definition of subclass based on voltage range

DA 300 kV ≤ Un < 380 kV DB

DC 250 kV ≤ Un < 300 kV DD

DE 220 kV ≤ Un < 250 kV DF

DG DH

DJ … DY DZ

Table 4 c)

Infrastructure objects, Class E acc. to Table 3 Installations with 110 kV ≤ Un < 220 kV

Code Definition of subclass based on voltage range

EA 180 kV ≤ Un < 220 kV EB

EC 150 kV ≤ Un < 180 kV (nominal voltage 150 (154) kV) ED

EE 132 kV ≤ Un < 150 kV (nominal voltage 132 (138) kV) EF

EG 110 kV ≤ Un < 132 kV (nominal voltage 110 (115) kV)

EH EJ … EY

EZ Combined voltage range

Table 4 d)

Infrastructure objects, Class N acc. to Table 3

Installations with Un < 1 kV (especially for auxiliary power distribution)

Code Definition of subclass based on voltage range

NA AC: Un > 400 V NB … ND

NE AC: Un ≤ 400 V NF … NJ

NK DC: Un ≥ 110 V NL … NP

NQ DC: 24 V < Un < 110 V NR … NT

NU DC: Un ≤ 24 V NZ Combined voltage range

Table 4 e)

Infrastructure objects, Class X acc. to Table 3 Objects for fulfilling auxiliary purposes (not associated with the main process)

Code Definition of subclass based on voltage range

XA Air conditioning system XB Fire protection system XC Electric power distribution (light and power)

XD Water-supply XE Sewage disposal plant

XF Ventilation system, smoke extraction system XG Oil leakage container, rain water collection system

XH Crane-system XJ … XY

XZ Combined facilities

Table A.1: Recommended Classification of Switchgears in High- and Medium Voltage Stations

Type of equipment Reference identifier Circuit breaker 1. Switch -QA1 2. Switch -QA2 n. Switch -QAn Disconnecting switch, load-break switch Disconnecting switch to busbar 1 ... 4 -QB1 ... 4 freely available -QB5 2. Disconnecting switch to busbar 1 ... 4 -QB10, 20, ... 40 freely available -QB6 Disconnecting switch to bypass bar -QB7 freely available (for example disconnecting switch to 2. bypass bar) -QB8 Disconnecting switch for cables/OHL -QB9 Several disconnecting switches for cables/OHL -QB91, 92, ... 99 Disconnecting switch for sectional disconnection from busbar 1 -QB11, 12, ... 19 Disconnecting switch for sectional disconnection from busbar 2 -QB21, 22, ... 29 Disconnecting switch for sectional disconnection from busbar 3 -QB31, 32, ... 39 Disconnecting switch for sectional disconnection from busbar 4 -QB41, 42, ... 49 freely available -QB51, 52, ... 59 freely available -QB61, 62, ... 69 Disconnecting switch for sectional disconnection from bypass bar 1 -QB71, 72, ... 79 Disconnecting switch for sectional disconnection from bypass bar 2 -QB81, 82, ... 89 Earthing switch Earthing switch -QC1, -QC2, -QC3 freely available -QC4 ... 8 Earthing switch for cables/OHL -QC9 Several earthing switches for cables/OHL -QC91, 92, ... 99 Earthing switch for busbar 1 -QC11, 12, ... 19 Earthing switch for busbar 2 -QC21, 22, ... 29 Earthing switch for busbar 3 -QC31, 32, ... 39 Earthing switch for busbar 4 -QC41, 42, ... 49 freely available -QC51, 52, ... 59 freely available -QC61, 62, ... 69 Earthing switch for bypass bar 1 -QC71, 72, ... 79 freely available (for example earthing switch for bypass bar 2) -QC81, 82, ... 89 Combined facilities Combines switch, three-position switch -QZ …

Table A.2: Recommended Classification of Measuring Transformers in High- and Medium Voltage Stations

Voltage transformer 1. Voltage transformer -BA1 2. Voltage transformer -BA2 freely available -BA3, 4, 5 Voltage transformer at busbar section 1 -BA11, 12, 13, ... Voltage transformer at busbar section 2 -BA21, 22, 23, ... Voltage transformer at the branch -BA91, 92, 93 … Current transformer 1. Current transformer -BC1 2. Current transformer -BC2 3. Current transformer -BC3 4. Current transformer -BC4 Current transformer in busbar 1 -BC11, 12, 13, ... Current transformer in busbar 2 -BC21, 22, 23, ... Current transformer in busbar 3 -BC31, 32, 33, ... Current transformer in busbar 4 -BC41, 42, 43, ... Current transformer at the branch (for example summation current -BC91, 92, 93, ... transformer) Combined transformer 1. Combined transformer -BZ1 2. Combined transformer -BZ2 3. Combined transformer -BZ3 4. Combined transformer -BZ4

Table A.3: Comparison of the former Classification in accordance with DIN 40719-2 and the Current Reference Designation for Switch Gears

Type of equipment Reference identifier (new) (old) Circuit breaker -Q0 1. Switch -QA1 -Q01 2. Switch -QA2 -Q02 Busbar system 1 Disconnecting switch to busbar -QB1 -Q1 2. Disconnecting switch to busbar -QB10 -Q10 Disconnecting switch for sectional disconnection -QB11, 12, ... 19 -Q11 ... 14 Earthing switch for busbar -QC11, 12, ... 19 -Q15 ... 19 Busbar system 2 Disconnecting switch to busbar -QB2 -Q2 2. Disconnecting switch to busbar -QB20 -Q20 Disconnecting switch for sectional disconnection -QB21, 22, ... 29 -Q21 ... 24 Earthing switch for busbar -QC21, 22, ... 29 -Q25 ... 29 Busbar system 3 Disconnecting switch to busbar -QB3 -Q3 2. Disconnecting switch to busbar -QB30 -Q30 Disconnecting switch for sectional disconnection -QB31, 32, ... 39 -Q31 ... 34 Earthing switch for busbar -QC31, 32, ... 39 -Q35 ... 39 Busbar system 4 Disconnecting switch to busbar -QB4 -Q4 2. Disconnecting switch to busbar -QB40 -Q40 Disconnecting switch for sectional disconnection -QB41, 42, ... 49 -Q41 ... 44 Earthing switch for busbar -QC41, 42, ... 49 -Q45 ... 49 Earthing switch general -Q5 1. Earthing switch -QC1 -Q51 2. Earthing switch -QC2 -Q52 3. Earthing switch -QC3 --- Bypass bar 1 Disconnecting switch -QB7 -Q7 2. Disconnecting switch -QB70 -Q70 Disconnecting switch for sectional disconnection -QB71, 72, ... 79 -Q71 ... 74 Earthing switch for bypass bar -QC71, 72, ... 79 -Q75 ... 79 Bypass bar 2 Disconnecting switch -QB8 2. Disconnecting switch -QB80 Disconnecting switch for sectional disconnection -QB81, 82, ... 89 Earthing switch for bypass bar -QE81, 82, ... 89 Disconnecting switch for cables/OHL general -QB9 -Q9 multiple earthing switches -QB91, 92, ... 99 -Q91, Q92 Earthing switch for cables/OHL general -QC9 -Q8 multiple earthing switches -QC91, 92, ... 99 -Q81, Q82 Freely available; all not used numbers for example: earthing switch for transformer star point E.g. -QC6 -Q6 Combined switch -QZ … ---

The following figures are recommendations for switchgear and measuring transformer classification in standard arrangements. The use of the reference designation ensures high reusability of standard arrangements for planning and easy recognition in operation.

The examples follow the principle that each arrangement receives a new set of reference numbers (e.g. Figure A.2). The dot-dashed line indicates the arrangement limits.

Figure A.1: Examples for Switchgears and Measuring Transformer classification in Standard Arrangements

coupler with bypass separated in 2 feeders coupler with bypass in one feeder

feeder n feeder n+1

-QC11 -QC21 -QC31 -QC11 -QC21 -QC31 -QB11 -QB12 -QB11 -QB11

-QB21 -QB22 -QB21 -QB21

-QB31 -QB32 -QB31 -QB31

-QB1 -QB2 -QB3 -QB10 -QB30 -QB1 -QB2 -QB3 -QB1 -QB3

-QC1 -QC1

-QA1 -QA1

-QC2 -QC2

-QB7 -QB7

-QB71 bypass -QB72 -QB71 bypass -QB71

-QC71 -QC71

Figure A.2: Examples for Classification of Switchgears in a Coupling Bay

Figure A.3: Examples for Classification of Switchgears and Measurement Transformers in Measurement Bay (assigned to a Bay)

Figure A.4: Examples for Classification of Switchgears in Bays with Specialized Busbars Arrangements