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
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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
IG EVU-02
IG EVU-03
IG EVU-04
Designation and Documentation - part 1: Structuring principles and
Reference designation in accordance with IEC 81346
Designation and Documentation - part 2: Designation and order of
Documentation in accordance with IEC 61355
Designation and Documentation - part 3: Planning Tool for
Structuring and Designation
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.
IG EVU-001E: Designation and documentation – Part 1
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-3Preface
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.
IG EVU-001E: Designation and documentation – Part 1
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Content
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
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-57.4
Table 3: Classification of Infrastructure Objects ................................................................ 60
7.5
Table 4: Subclasses for particular Classes according to Table 3 ....................................... 61
Annex A ........................................................................................................................................ 64
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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
relevance chapter]
International Electro Technical Vocabulary (IEV) [nnn shows the
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)
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3 Terms and Definitions
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]
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4 Structuring Principle
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.
IG EVU-001E: Designation and documentation – Part 1
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-9The 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)
IG EVU-001E: Designation and documentation – Part 1
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- 10 switchgear
superior equipment
station bus
1. s ubstation 380 kV
control cable
2. s ubstation 380 kV
1. s ubstation 110 kV
control board
transformer substation
380/110 kV
metering cubicle
transformer substation
110/10 kV
interfac e cubicle
parallel switching
sys tem
1. AC 400/230-V-distribution
protec tion c ubicle 1
2. AC 400/230-V- distribution
protec tion c ubicle 2
DC 220-V- distribution
DC 60-V- distribution
feeder 1
air conditioning
feeder 2
control cubicle
fire protection system
feeder 3
protec tion c ubicle 1
building pow er distribution 1
feeder 4
protec tion c ubicle 2
MCB
building pow er distribution 2
feeder 5
HV-power rails
protec tion relay
building pow er distribution 3
sub distribution
earthing c ables
video-surveillance s ys tem
bus bars
field bus
telecommunication s ystem
earthing c ables
control cable
civil infrastruc ture
station bus
circuit break er
control cable
switch
relays
switch unit
drive unit
control cables, wires
sockets, terminals
bus bar is olating
switch1
bus bar is olating
switch 2
relays
isolating switc h
MCB
switch
control unit
earthing switc h1
drive unit
control cables, wires
earthing switc h 2
sockets, terminals
earthing switc h
voltage transformer 1
current trans former 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.
IG EVU-001E: Designation and documentation – Part 1
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- 11 -
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).
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English translation. 2019-09-18
- 12 switchgear
distribute 380 kV (1)
distribute 380 kV (2)
distribute 110 kV
control (switchyard)
distribute 10 kV
mess age (switchyard)
distribute AC 400/230 V
measure (switc hyard)
distribute DC 220 V
protec t (switchyard)
distribute DC 60 V
station air condition
fire monitoring
building pow er supply
area monitoring
telecommunication
power switch 1
(feeder func tion)
power switch 2
(bay function)
c ontrol (bay)
power switch 3
(bay function)
measure (bay)
power switch 4
(bay function)
power switch
message (bay)
protect (bay)
control
power switch 5
(bay function)
protec t
mess age
electrical power
dis tribution
(bus bar func tion)
monitoring
power switch
conduct elec tric al
energy
power circuit is olation
(busbar 1)
power circuit is olation
(busbar 2)
control
power circuit is olation
(OHL)
monitoring
power circuit earth,
(circuit breaker)
conduct elec tric al
energy
mess age
power switch
power circuit earth,
(OHL)
c onduct electric al
energy
transform 380/110 kV
transform 110/10 kV
control (group)
mess age (group)
measure (group)
protec t (group)
transform 1
transform 2
c ontrol
message
measure
protect
trans form
Figure 2 – Example of a Function related Structure
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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
trans former area 1
dis tribution room
trans former 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 surfac e
floor
bas ement
cable cellar 1
stairwell
cable cellar 2
elevator s haft
water tank room
safety area (fence)
monitoring s ector
Figure 3 - Example of a Location related Structure
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- 14 -
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 highestlevel hub).
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- 15 -
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).
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- 16 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 singlelevel 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
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English translation. 2019-09-18
- 17 letters for subclasses.
switchgear
-A1
superior equipment
-C1
1. s ubstation 380 k V
-C2
2. s ubstation 380 k V
-E1
-T1
-T2
-W F1…n
station bus
-W G1…n
control c able
1. s ubstation 110 k V
-S1
control board
transformer substation
380/110 kV
-P1
metering c ubicle
transformer substation 110/10
kV
-K1
interfac e cubicle
-K2
parallel switc hing
sys tem
-NE1
1. AC 400/230-V-distribution
-B1
protec tion c ubicle 1
-NE2
2. AC 400/230-V- distribution
-B2
protec tion c ubicle 2
-NK1
DC 220-V- distribution
-NQ1
DC 60-V- distribution
-Q01
feeder 1
-XA1
air conditioning
-Q02
feeder 2
-S1
control c ubicle
-XB1
fire protection system
-Q03
feeder 3
-B1
protec tion c ubicle1
-XC1
building pow er distribution 1
-Q04
feeder 4
-B2
protec tion c ubicle2
-XC2
building pow er distribution 2
-Q05
feeder 5
-W B1…n
HV-power rails
-XC3
earthing c ables
building pow er distribution 3
-W C1…n
sub distribution
-W E1…n
-Y1
video-surveillance s ystem
-W A1…n
bus bars
-W F1…n
field bus
-Y2
telecommunication system
-W E1…n
earthing c ables
-W G1…n
control c able
-W F1…n
station bus
-W G1…n
control c able
-Z1…n
civil infrastruc ture
-QA1
bus bar is olating
switch1
-QB2
bus bar is olating
switch 2
-QC1
is olating switc h
earthing switc h1
-QC2
earthing switc h 2
-QC9
earthing switc h
-BA1
voltage
trans former 1
-BC1
current
trans former 1
-B1
switch
-K1…n
relays
-Q1
switch unit
-M1
drive unit
-W 1…n
c ontrol c ables,
wires
-X1…n
s ock ets , terminals
-K1…n
relays
-P1…n
switch
-F1
MCB
-Q1
switch unit
-M1
drive unit
-W 1…n
c ontrol c ables,
wires
-X1…n
s ock ets , terminals
Figure 6 - Example for Product related Reference Designation
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MCB
protec tion relay
circuit break er
-QB1
-QB9
-F1
-B1…n
English translation. 2019-09-18
- 18 Examples:
Object
Signaling switch in CB 1 in the feeder 1 of the second 380 kV
station
Protection cubicle of bay 5 of the second 380kV station
Current transformer 1 of bay 5 of the second 380kV station
Reference
designation
-C2-Q01-QA1-B1
-C2-Q05-B1
-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
Control cable in the CB of bay 1 of the second 380kV station
Control cable within bay 1 of the second 380kV station
Control cable within the second 380kV station (e.g. between two
bays)
Control cable in the station (e.g. between the 110kV station and
380kV station
Reference
designation
-C2-Q01-QA1-W1
-C2-Q01-WG1
-C2-WG1
-A1-WG1
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.
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English translation. 2019-09-18
- 19 Table 3 and sub class es
according to Table 4
Table 1
Table 1 and sub
class es ac cording to
Table 2
Table 1 and s ub
class es according to
Table 2
switchgear
=C1
distribute 380 kV (1)
=C2
distribute 380 kV (2)
=E1
distribute 110 kV
=S1
control (Switc hyard)
=K1
distribute 10 kV
=P1
mess age (Switchyard)
=NE1
distribute AC 400/230 V
=P2
measure (Switchyard)
=NK1
distribute DC 220 V
=F1
protec t (Switchyard)
=NQ1
distribute DC 60 V
=XA1
station air condition
=Q01
=XB1
fire monitoring
power switch 1 (bay
func tion)
=XC1
building pow er supply
=Q02
power switch 2 (bay
func tion)
=S1
c ontrol (Bay)
=P1
message (Bay)
power switch 3 (bay
func tion)
=P2
measure (Bay)
=F1
protect (Bay)
=Q04
power switch 4 (bay
func tion)
=QA1
power switch
=Q05
power switch 5 (bay
func tion)
=Y1
area monitoring
=Y2
telecommunication
=Q03
=W 1
=S1
electrical power
dis tribution (busbar
func tion)
protec t
=P1
mess age
=P2
monitoring
=Q1
=W B1
transform 380/110 kV
=T2
transform 110/10 kV
=S1
control (Group)
=P1
mess age (Group)
=P2
measure (Group)
=F1
protec t (Group)
=T1
transform 1
=T2
transform 2
power switch
conduct elec tric al
energy
=QB1
disc onnect power
circuit (Busbar1)
=QB2
disc onnect power
circuit (Busbar2)
=S1
control
=P1
mess age
disc onnect power
circuit (OHL)
=P2
monitoring
=Q1
power switch
=QB9
=T1
control
=F1
=QC1
earth power circuit,
(circuit breaker)
=QC9
earth power circuit,
(OHL)
=W B1
c onduct electric al
energy
=S1
c ontrol
=P1
message
=P2
measure
=F1
protect
=T1
trans form
=W B1
conduct elec tric al
energy
Figure 7 - Example of Function related Structure with Reference Designation
Examples:
Object
Functional control of bay function 1 “power
switching” of the second 380kV distribution function
The “protect function” of bay function 5 of the
second 380kV distribution function
Reference designation
=C2=Q01=QA1=S1
=C2=Q05=F1
Function related reference designation doesn’t identify equipment parts, equipment units or
stations in this case.
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- 20 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
freely selec ted
Table 3
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
+B1
ground floor
+E1
110-kV-building 1
+E2
110-kV-building 2
+J1
20-kV-building
+C1
+T1
trans former area 1
+N1
dis tribution room
+T2
trans former area 2
+N2
battery room
+U1
device storage
+V1
garage
+Z1
transportation ways
+U1
spare part store
+Z2
parking
+X1
floor
+A1
control room
+A2
telec ommunic atio
n room
+C1
+Z3
high voltage room
1. floor
+W 1
lounge
+C2
2. floor
+W 2
sanitary room
+D1
roof surfac e
+X1
floor
+A1
bas ement
+C1
cable cellar 1
+Z1
stairwell
+C2
cable cellar 2
+Z2
elevator s haft
+U1
water tank room
safety area (fence)
+A1...10
monitoring s ector
Figure 8 – Example of Location related Structure with Reference Designation
IG EVU-001E: Designation and documentation – Part 1
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- 21 Examples:
object
Battery room on ground floor of the first building of 110kV
The 7th control section in the defined safety zone (fenced area
of the station)
Reference
designation
+E1+B1+N2
+Z3+A7
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
<STATION>-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
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- 22 -
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 abovementioned 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.
IG EVU-001E: Designation and documentation – Part 1
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- 23 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.
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- 24 -
6 Special Cases of the Product Reference Designation
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 –E1Q02.
The following reference designations are possible:
Cable from
-E1-Q01
-E1-Q01-S1
-E1-Q01
-E1-Q02-S1
Cable to
-E1-Q02
-E1-Q02-C2
-E1-Q02-S1
-E1-Q02-B2
Reference designation of cable
-E1-W1
-E1-W2
-E1-W3
-E1-Q02-W1
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- 25 -
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
-E1
-Q07
-E1-Q07-WG11
-XG7
110-kVswitchgear 1
-X1
-X2
-W1
bay 7
-B1
-XG4
-S1
-WG11
-E1-Q07-S1
-E1-Q07-B1
-1
-2
-E1-Q07-WG11
control cubicle
-XG7
socket 7
control cable
11
-X1
socket 1
-X2
socket 2
110-kVswitchgear 1
-Q07
-XG4
-2
socket 4
-W1 cable
-E1
-XG7
protection
cubicle
-XG4
bay 7
-B1
-1
protection
cubicle
-XG4
socket 4
-1
-S1
control cubicle
-XG7
-WG11
-E1-Q07-QA1
control cable
11
-E1-Q07-S1
-E1
-WG1
-2
bay 7
-QA1
-XG5
-S1
circuit breaker
-WG1
cable 1
-XG1
socket 1
control cubicle
-XG5
Figure 11 – Designation of Cables with Plugs
IG EVU-001E: Designation and documentation – Part 1
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-1
110-kVswitchgear 1
-Q07
-XG1
-2
socket 7
English translation. 2019-09-18
socket 2
- 26 -
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.
IG EVU-001E: Designation and documentation – Part 1
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- 27 -
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
Isolating switch
Combined Reference
Designation
-QB1
Busbar
-WA1
Fuses
-F1
Current Transformer
-BC1
Single Pole
-QB1-1
-QB1-2
-QB1-3
-WA1-1
-WA1-2
-WA1-3
-F1-1
-F1-2
-F1-3
-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).
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- 28 -
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
-1
-2
-3
-QB1
-QB1
-1
pole 1
-2
Pol 2
-3
pole 3
-M1
drive unit
-B1
-M1
position switch
common drive
pole 1
pole 2
pole 3
-1
-2
-3
-QB1
-QB1
-1
pole 1
-M1
drive unit
-B1
-2
-M1
-M1
-M1
-M1
drive unit
-B1
-3
drive per pole
position switch
pole 2
position switch
pole 3
-M1
drive unit
-B1
position switch
Figure 14 – Examples of the Designation of Isolators in different Constructions.
Examples:
object
Signaling switch in the common motor unit
Signaling switch in a motor unit per pole
IG EVU-001E: Designation and documentation – Part 1
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reference designation
-QB1-M1-B1
-QB1-1-M1-B1
English translation. 2019-09-18
- 29 -
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).
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- 30 -
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).
Busbar 1
Busbar 2
Busbar 3
Bypass
Section 1
Section 2
Section 3
-WA1-W1
-WA1-W2
-WA1-W3
-WA2-W1
-WA2-W2
-WA2-W3
-WA3-W1
-WA3-W2
-WA3-W3
-WA7-W1
-WA7-W2
-WA7-W3
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
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- 31 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
-BP1
-QZ1
-WB1
density sensor
(for CB gas compartment)
isolating / earthing switch
compartment
-Q1
isolating switch
-Q2
earthing switch
-BP1
density sensor
(for gas compartment 01)
-BP1
density sensor
(for gas compartment 02)
conductor compartment
Figure 18 – Density Sensors in the Compartment
Examples of the designation of density sensors with information in text form:
Reference designation
-E1-Q01-QA1-BP1
-E1-Q01-QZ1-BP1
-E1-Q01-WB1-BP1
Information in the circuit diagram
Monitoring CB gas compartment
Monitoring gas compartment 1
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.
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- 32 station
-E1
1. switchgear 110 kV
-Q01
HV - switchyard 01
-QA1
circuit breaker compartment
-Q1
-BC1
-QB1
current transformer
busbar-isolating switch
compartment
-Q1
-P1
circuit breaker
isolating switch
gas monitoring cubicle
-PG1
sensor
(for gas compartment 01)
-PG2
sensor
(for gas compartment 02)
-PG3
sensor
(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 mainand back up protection
-C1Q01B1
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).
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- 33 -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
the first frame in the cubicle
the first control device in the first frame
the first terminal block in the cubicle
-E1-Q01-S1
-E1-Q01-S1-A1
-E1-Q01-S1-A1-K1
-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
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- 34 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
Function
1
Function
2
Product B
Function
3
Product C
Function
4
Function
5
Function
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
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- 35 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.
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- 36 -
7 Objects Classification
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).
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- 37 -
Table 1 - Classification of Objects according Purpose or Task and Examples
for Functions and Products
code
Intended purpose or task of
object
(in accordance with IEC
81346-2)
A
Examples of terms describing
the intended purpose or the
task of objects
Examples of typical components
Combined field control- / protection
device
sensor screen
Two or more purposes or tasks
NOTE: This class is only for
objects for which no main
intended purpose or task can
be identified
B
Converting an input variable
(physical property, condition or
event) into a signal for further
proc essing
Detecting
Sensing
Recording Measurements
Monitoring
C
Storing of energy, information
or material
Recording
storage
D
Reserved for future
standardization
E
Supply of radiant or thermal
energy
Cooling
Heating
Lighting
Radiating
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Auxiliary switch (as position indicator)
Buchholz relay
Current transformer
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
Buffer battery
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
Boiler
Electrical heater
Heater
Lamp
Laser
Luminaire
English translation. 2019-09-18
- 38 code
Intended purpose or task of
object
(in accordance with IEC
81346-2)
F
Direct protection (self-acting)
of a flow of energy, signals,
pers onnel or equipment from
dangerous or unwanted
conditions
Including systems and
equipment for protective
purposes
Examples of terms describing
the intended purpose or the
task of objects
Absorbing
Guarding
Preventing
Protecting
Securing
Shielding
Fuse
Guard
Miniature circuit-breaker
Oil extension vessel
Overvoltage limiter
Rupture disc
Safety valve
Shielding
Surge arrester
Thermal overload release
Generating
Dry cell battery
Fan
Fuel cell
Generator
Pump
Signal generator
Solar cell
Protection devic es see code B.
G
Initiating a flow of energy or
material
Examples of typical components
or
Generating signals used as
information c arriers or
referenc e sourc e
H
Producing a new kind of
material or product
Assembling
Crushing
Disassembling
Fractionating
Material removing
Milling
Mixing
Producing
Pulverizing
Centrifuge
Mill
Mixer
Separator
I
Not to be applied
---
---
J
Reserved for future
standardization
K
Processing (rec eiving, treating
and providing) signals or
information
Closing (of control circuits)
Continuous controlling
Delaying
Opening (of control circuits)
Switching (of control circuits)
Synchronizing
All-or-nothing relay
Automation device
Auxiliary relay
Blocking device
Computer
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
Actuating
Driving
Actuating coil
Actuator
Electric motor
Linear motor
---
---
(excluding objects for
protective purpos es, see
Class B or F)
L
Reserved for future
standardization
M
Providing mechanic al energy
(rotational or linear mechanic al
motion) for driving purposes
N
Reserved for future
standardization
O
Not to be applied
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- 39 code
Intended purpose or task of
object
(in accordance with IEC
81346-2)
Examples of terms describing
the intended purpose or the
task of objects
Examples of typical components
P
Presenting information
Alarming
Communicating
Displaying
Indicating
Informing
Measuring (presentation of variables)
Presenting
Printing
Warning
Bell
Clock
Current measuring device
Event counter
Horn
Indicator
Loudspeaker
Mechanical drop indicator relay
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
a flow of energy, of signals
Opening (of energy, signals and
material flow)
Closing (of energy, signals and
material flow)
Switching (of energy, signals and
material flow)
Clutching
Circuit-breaker
Contactor (for power)
Disconnector
Earthing switch
Fuse switch (if main purpose is
protection, see Class F)
Fuse-switch-disconnector (if main
purpose is protection, see Class F)
Load-break switch
Motor protection switch
Motor starter
Power transistor
Switchyard
Thyristor
Blocking
Damping
Restricting
Limiting
Stabilizing
Diode
Inductor
Limiter
Resistor
Zener diode
Influencing
Manually controlling
Selecting
Control cabinet (control and operate)
Control panel (operate)
Control switch
Cordless mouse
Discrepancy switch
Keyboard
Light pen
Push-button switch
Push-button valve
Selector switch
Set-point adjuster
(for signals in control circuits,
see Classes K and S) or of
material
R
Restricting or stabilizing
motion or a flow of
energy, information or
material
S
Converting a manual operation
into a signal for further
proc essing
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- 40 code
Intended purpose or task of
object
(in accordance with IEC
81346-2)
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
Examples of terms describing
the intended purpose or the
task of objects
Amplifying
Modulating
Transforming
Casting
Compressing
Converting
Cutting
Material deforming
Expanding
Forging
Grinding
Rolling
Size enlargement
Size reduction
Turning
Examples of typical components
Antenna
Amplifier
Charger
Frequency convertor
Interposing transformer
Inverter
Power supply
Power transformer
Rectifier
Signal converter
Test-value transmitter
Transducer
Transformer
U
Keeping objects in a defined
position
Bearing
Carrying
Holding
Supporting
Assembly plate
Assembly rail
Bearings
Bracket
Building foundation
Cabinet
Cable duct
Cable framework
Cable tray
Container
Fixture
Gateway
Insulator
Pipe bridge
Pole
Roller bearing
Room
V
Processing (treating) of
material or products (including
preparatory and posttreatment)
Coating
Cleaning
Dehydrating
Derusting
Drying
Filtering
Heat treatment
Packing
Preconditioning
Recovering
Re-finishing
Sealing
Separating
Sorting
Stirring
Surface treatment
Wrapping
Separator
Filter
Insulator-cleaner
Oil-processing plant
W
Guiding or transporting energy, Distributing
Guiding
signals, material or products
from one plac e to another
Leading
Positioning
Transporting
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Busbar
Bushing
Cable
Conductor
Crane
Data bus
Oil-pipeline
Optical fiber
Pipe
Sub-distribution board
English translation. 2019-09-18
- 41 code
Intended purpose or task of
object
(in accordance with IEC
81346-2)
X
Connecting objects
Y
Reserved for future
standardization
Z
Reserved for future
standardization
Examples of terms describing
the intended purpose or the
task of objects
Connecting
Coupling
Joining
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Examples of typical components
Connector
Converter-terminal box
Marshalling racks
Piping flange
Plug connector
Socket
Terminal
Terminal block
Terminal strip
English translation. 2019-09-18
- 42 -
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
- sub class F…K
- sub class L…Y
- sub class Z
for objects with regard to electrical energy
for objects with regard to information and signals
for objects with regard to mechanical, constructional
technology, etc. (non-electrical technology)
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
AA … AE
Objects related to electrical energy
(free for definition by the user)
AF … AK
Objects related to inf ormation and signals
Examples of components
(free for definition by the user)
AL … AY
Objects related to proc ess, 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 purpos e or task can be identified.
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- 43 Table 2 -
(continued)
Main class B
Converting an input variable (physical property, condition or event) into a signal for further processing
Code
Definition of subclass
based on input measured variable
BA
Electrical potential
BB
BC
Not used
Electrical current
BD
BE
Density
Other electrical or electromagnetic variable
BF
BG
Flow
Gauge, position, length
(including distance, elongation, amplitude)
BH
BJ
BK
BL
BM
BN
BP
BQ
Not used
Power
Time
Level
Moisture, Humidity
Not used
Pressure, Vacuum
Quality
(composition, concentration, purity, material
property)
Radiation
Speed, frequency
(including acceleration)
Temperature
Multi-variable
Not used
Weight, Force
Other quantities
Not used
Number of events, counts, combined tasks
BR
BS
BT
BU
BV
BW
BX
BY
BZ
Examples of components
Measuring relay (voltage), measuring
shunt (voltage), measuring transformer
(voltage), protection relay (voltage),
voltage transformer
Current transformer, measuring relay
(current), measuring transformer
(current), protection relay (current),
overload relay (current) (Shunt)
Measuring relay, measuring shunt
(resistance), measuring transformer,
protection relay
Flow meter, gas meter, water meter
Motion sensor, movement detector,
position switch, proximity switch,
proximity sensor
Clock, time counter
Level sensor
Humidity meter
Pressure gauge, pressure sensor
Gas analyzer, x-ray machine
Flame detector, smoke detector
Accelerometer, speedometer,
tachometer, vibration pickup
Temperature sensor, temperature monitor
Buchholz relay, protection cubicle
Load cell
Microphone, video camera
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.
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- 44 Table 2 -
(continued)
Main class C
Storing of energy, information or material
Code
Definition of subclass based on kind of
storage
Examples of components
CA
Capacitive storage of electric energy
Capacitor
CB
Inductive storage of electric energy
Coil, Superc onductor
CC
Chemical storage of electric energy
Buffer battery
NOTE Batteries seen as energy sourc es
are assigned to main Class G
CD … CE
CF
CG … CK
CL
Not used
---
Storage of information
CD-ROM, EPROM, event rec order, hard
disk, magnetic tape recorder, memory,
RAM, video recorder, voltage rec order
Not used
---
Open storage of material at fixed loc ation
Bunker, cistern, paper reel stand, pit,
pool
(collection, housing)
CM
Clos ed storage of material at fixed loc ation
(collection, housing)
Accumulator, barrel, boiler, buffer,
container, depository, flash tank, gas
holder, safe, silo, tank
CN
Moveable storage of material (c ollection, housing)
Container, transportation c ontainers, gas
cylinder, shipping c ontainer
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 mechanic al energy
Flywheel, rubber band
Not used
---
CR … CY
CZ
Combined tasks
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- 45 Table 2 -
(continued)
Main class E:
Providing radiant or thermal energy
Code
Definition of subclass based on generated
output and method for generation
Examples of components
EA
Generation of electromagnetic radiation for
lighting purpos es using electrical energy
Fluorescent lamp, fluorescent tube,
incandescent lamp, lamp, lamp bulb,
las er, LED lamp, mas er, UV radiator
EB
Generation of heat by c onversion of electrical
energy
Electrical boiler, electrical furnace,
electrical heater, electrical radiator,
electrode steam boiler, heating rod,
heating wire, infrared heating element
EC
Generation of cooling energy by c onversion of
electrical energy
Compression chiller, cooling unit,
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 purpos es
EG … EK
Not used
---
EL
Generation of electromagnetic radiation for
lighting purpos es by combustion of fossil fuels
Gas light, gas lamp
EM
Generation of heat by c onversion of chemic al
energy
Boiler, burner, c ombustion grate, furnace
EN
Generation of cooling energy by c onversion of
chemic al energy
Cold pump, refrigerator
EP
Generation of heat by c onvection
Boiler, c ondens er, evaporator,
ec onomizer, feed water heater, heat
exchanger, heat recovery steam
generator, radiator, steam generator
EQ
Generation of cooling energy by c onvection
Cold pump, freezer, refrigerator
ER
Generation of heat by c onversion of mechanical
energy
ES
Generation of cooling energy by c onversion of
mechanical energy
Mechanical refrigerator
ET
Generation of heat by nuclear fission
Nuclear reactor
EU
Generation of particle radiation
Neutron generator
Not used
---
EV … EY
EZ
Combined tasks
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- 46 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
phenomenon to protect against
Code
Examples of components
FA
Protection against overvoltage
Arrester, surge arrester
FB
Protection against residual current
Residual current devic e
FC
Protection against overcurrent
Fuse, fuse unit, miniature circuit-breaker,
thermal overload releas e
FD
Not used
---
FE
Protection against other electrical hazards
Enclosure for electromagnetic shielding,
Faraday cage
Not used
---
FL
Protection against hazardous pressure c ondition
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 c ondition
or damage
Impact protection, protection device,
protective shield, protective sleeve for
thermocouple, safety clutch
FP
Protection against hazardous emission
Reactor protection equipment
FF … FK
(E.g. radiation, chemical emissions, noise)
FQ
Protection against hazards or unwanted situations
for pers on or animals
(e.g. saf eguarding)
Airbag, barriers, contact protection,
escape door, escape window, fenc e,
gates, glare protection, guard, vision
protection, railing, s afety belt
FR
Protection of mechanic al and building technology
products and systems against wear (e.g.
corrosion)
Cathodic protection anode
FS
Protection against environmental effects
(e.g. weather, geophysical effects)
Avalanche protection devic e, geophysical
protection device, weather protection
device
---
---
FT … FY
FZ
Combined tasks
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- 47 Table 2 -
(continued)
Main class G
Initiating a flow of energy or material Generating signals used as information carriers or reference
source
Code
Definition of subclass based on kind of
initiation and kind of flow
Examples of components
GA
Initiation of an electrical energy flow by use of
mechanical energy
Dynamo, generator, motor-generator s et,
power generator, rotating generator
GB
Initiation of an electrical energy flow by chemical
conversion
Battery, dry c ell battery, fuel cell
GC
Initiation of an electrical energy flow using light
Solar c ell
Not used
---
Generation of signals as an information carrier
Signal generator, transducer
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 substanc es
driven by an energy supply
Pump, screw conveyor
GQ
Initiation of a flow of gas eous substances by a
mechanical driver
Aspirator, blower, c ompressor, fan,
vacuum pump, ventilator
GR
Not used
GS
Initiation of a flow of liquid or gaseous substances
by driving medium
Ejector, injector, jet
GT
Initiation of a flow of liquid or gaseous substances
Lubricator, oiler
GD … GE
GF
GG … GK
by gravity
GU … GY
GZ
Not used
---
Combined tasks
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- 48 Table 2 -
(continued)
Main class H
Producing a new kind of material or product
Code
Definition of subclass based on method
applied to produce material or product
Examples of components
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
centrifugal force
Centrifuge, c yclone device
HN
Separation of mixtures of substances by gravity
Separator, s ettling tank, vibrator
HP
Separation of mixtures of substances by thermal
proc esses
Distillation column, drying (Munters air
dryer), extraction s ystem
HQ
Separation of mixtures of substances by filtering
or classification
Fluid filter, gas filter, grate, rake, screen
HR
Separation of mixtures of substances by
electrostatic or magnetic forces
Electrostatic precipitator, magnetic
separator
HS
Separation of mixtures of substances by physical
proc esses
Absorption washer, active charcoal
abs orber, ion exchanger, wet ash
scrubber
HT
Generation of new gas eous substances
Gasifier
HU
Generation of new form of solid material by
crushing
Crusher, mill
HV
Generation of new form of solid material by
coarsening
Briquette maker, pellet maker, sintering
facility, tablet maker
HW
Generation of new substanc es by mixing
Emulsifier, humidifier (steam), kneader,
mixer, mixing vessel, static mixer, stirrer
HX
Generation of new substanc es by chemic al
reaction
Reaction furnac e, reactor
HY
Generation of new substanc es by biologic al
reaction
Composter, fermenter
HZ
Combined tasks
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- 49 Table 2 -
(continued)
Main class K
Processing (receiving, treating and providing) signals or information (excluding objects for protective
purposes, see Class F)
Code
KA … KE
Definition of subclass based on kind of
signals to be processed
Examples of components
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, microproc essor, opto-coupler,
proc ess computer, programmable
controller, receiver, s afety logic module,
synchronizing devic e, time relay,
transistor, transmitter
KG
Processing of optical and ac oustical signals
Mirror, controller, test unit
KH
Processing of fluid and pneumatic signals
Controller (valve position c ontroller), fluid
feedback controller, pilot valve, valve
assembly
KJ
Processing of mechanic al signals
Controller, linkage
KK
Processing of various input/output information
carriers (e.g. electrical/pneumatic)
Controller, electro-hydraulic converter,
electric pilot valve
Not used
---
KL … KY
KZ
Combined tasks
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- 50 Table 2 -
(continued)
Main class M
Providing mechanical energy (rotational or linear mechanical motion) for driving purposes
Code
Definition of subclass based on kind of
driving force
Examples of components
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 mechanic al 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 forc e
Gas turbine
MQ
Driving by wind force
W ind turbine
MR
Driving by fluid flow force
Hydraulic turbine
MS
Driving by force using chemic al conversion means
Combustion engine
Not used
---
MT … MY
MZ
Combined tasks
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(continued)
Main class P
Presenting information
Code
PA … PE
Definition of subclass based on kind of
presented information and presentation
medium
Examples of components
Not used
---
PF
Visible presentation of discrete states
LED, mechanic al drop indicator, signal
lamp
PG
Visible presentation of values of discrete variables
Ammeter, barometer, clock, counter,
event counter, flow meter, frequenc y
meter, Geiger c ounter, manometer, sight
glass, synchroscope, thermometer,
voltmeter, watt-hour meter, wattmeter,
weight display
PH
Visible presentation of information in drawing,
pictorial and/or textual form
Analogue rec order, barcode printer,
event recorder (mainly for pres enting
information), printer, recording voltmeter,
text display, video screen
PJ
Audible presentation of information
Bell, horn, loudspeaker, whistle
PK
Tactile presentation of information
Vibrator
Not used
---
PL … PY
PZ
Combined tasks
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- 52 Table 2 -
(continued)
Main class Q
Controlled switching or varying a flow of energy, of signals or of material
Code
Definition of subclass based on purpose of
switching or variation
Examples of components
QA
Switching and variation of electrical energy
circuits
Circuit-breaker, contactor, motor starter,
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 clos ed
enclosures
Blank, blanking plate, damper, shutoff
valve (including drain valve), solenoid
valve
QN
Varying of flow of liquid substances in clos ed
enclosure
Control damper, control valve, gas
control path
QP
Switching or varying of flow of liquid substances
in open enclosures
Dam plate, lock gate
QQ
Providing access to an area
Bar (lock), cover, door, gate, lock,
turnstile, window
QR
Shut-off of flow of liquid substanc es (no valves)
Isolation device, rotary lock (open/clos e)
Not used
---
QS … QY
QZ
Combined tasks
Note: Main class Q applies for the classification of entire switc h switchyards. Subclasses are not nec essary.
Switchyards are distinguished by code numbers
(see Chapter 7.3 and T able 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
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- 53 Table 2 -
(continued)
Main class R
Restricting or stabilizing motion or a flow of energy, information or material
Code
Definition of subclass
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
RF
Not used
Stabilizing a signal
Equalizer, filter, low pass
Not used
---
RL
Restricting an unauthorized operation and/or
movement (mechanic al)
Blocking devic e, latch, lock, stop
RM
Restricting a return flow of gas eous, liquid and
flowing substances
Check valve
RN
Restricting a flow of liquid and gas eous
substances
Flow restrictor, orifice plate, Venturi
nozzle, water-proof seal
RP
Restricting an emission of sound
Nois e protection, s ound absorber
RQ
Restricting a thermal flow
Insulation, jacket, lagging, lining, thermal
insulation louver damper
RR
Restricting a mechanic al effect
Brick lining, compensator, shock
abs orber, vibration abs orption
RS
Restricting a chemic al effect
Brick lining, explosion protection, gas
penetration protection, splash protection
RT
Restricting an emission of
Blind, screen, shutter
RU
Restricting access to an area
RG … RK
RV … RY
RZ
light
Fenc e
Not used
Combined tasks
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- 54 Table 2 -
(continued)
Main class S
Converting a manual operation into a signal for further processing
Code
SA … SE
Definition of subclass
Examples of components
based on kind of output signal carrier
Not used
---
SF
Providing an electrical signal
Control switch, discrepanc y switch,
keyboard, light pen, pushbutton switch,
selector switch, set-point adjuster, switch
SG
Providing an electromagnetic, optical or ac oustical
signal
Cordless mouse
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
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- 55 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
Code
TA
TB
Definition of subclass
Examples of components
based on kind of transformation/conversion
Converting electrical energy while retaining the
DC/DC converter, frequenc y converter,
energy type and energy form
power transformer, transformer
Converting electrical energy while retaining the
Inverter, rectifier
energy type and changing the energy form
TC … TE
TF
Not used
---
Converting signals (retention of information
Aerial, amplifier, electrical transducer,
content)
impuls e amplifier, isolating c onverter,
signal c onverter
TG … TK
TL
Not used
---
Converting speed of rotation, torque, force into
Automatic gear, control coupling,
the s ame kind
fluid amplifier, indexing gear,
pressure amplifier, speed convertor,
torque c onverter
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
Converting a mechanical form by hot forming
Casting machine, extruder, forging,
(chipless deforming)
hot drawing equipment, hot rolling
TQ
TR
Converting radiation energy while retaining energy Magnifying glass, parabolic mirror
form
TS … TY
TZ
Examples:
Not used
---
Combined tasks
Devic es:
Tasks:
-TA1
1. Power transformer
=TA1
Transformation 220 kV/110 kV
-TF1
1. Signal converter
=TF1
Boosts the signal
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- 56 Table 2 -
(continued)
Main class U
Keeping objects in a defined position
Definition of subclass
Code
Examples of components
based on kind of object to be kept in a
position
UA
Holding and supporting electrical energy
equipment
Insulator, supporting structure,
transformer foundation
UB
Holding and supporting electrical energy c ables
and conductors
Cable duct, cable rack, cable tray, c able
trough, insulator, mast, portal, post
insulator
UC
Enclosing and supporting electrical energy
equipment
Cubicle, enc apsulation, housing
Not used
---
UF
Holding and supporting instruments, control and
communication equipment
Printed circuit board, sub-rack,
transducer rack
UG
Holding and supporting instruments, control and
communication cables and conductors
Cable rack, duct, shaft
UH
Enclosing and supporting instrumentation, control
and communic ation equipment
Cabinet, cubicle, enclosures
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
erection
Centring devic e, clamping, fixture
UR
Fastening and anchoring machinery
Anchor plate, bracket, carrier, erection
frame, erection plate
US
Spatial objects, housing and supporting other
objects
Corridor, duct, hall, passage, room,
shaft, stairwell
Not used
---
UD … UE
UJ … UK
UT … UY
UZ
Combined tasks
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- 57 Table 2 -
(continued)
Main class V
Processing (treating) of material or products (including preparatory and post-treatment)
Definition of subclass based on kind of
processing
Code
Examples of components
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 furnac e, balancing machine,
blast furnace, melting furnace
VQ
Cleaning material, product or facility
Building cleaning equipment, vacuum
cleaner, washing machine,
---
---
VR … VY
VZ
Combined tasks
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- 58 Table 2 -
(continued)
Main class W
Guiding or transporting energy, signals, material or products from one place to another
Code
WA
Definition of subclass based on
characteristics of energy, signal, material or
product to be conducted or routed
Distributing high voltage electrical energy
Examples of components
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
WD
Distributing low voltage electrical energy
(≤ 1 000 V AC or ≤ 1 500 V DC)
Busbar, motor control center, switchgear
assembly
Transporting low voltage electrical energy
Bushing, cable, conductor
(≤ 1 000 V AC or ≤ 1 500 V DC)
WE
Conducting earth potential or referenc e 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 c able, data line, measuring c able
WH
Transporting and routing optic al signal
Optical fiber, optical fiber cable, optical
wave guide
Not used
---
WL
Transporting material or product (not driven)
Conductor, inclined plane, roller table
WM
Conducting or guiding flow of substance in open
enclosure
Channel
WN
Conducting or guiding flow of substance in
flexible, closed enclosure
Hose
WP
Conducting or guiding flow of substance in rigid,
closed enclosure
Air duct, pipe, stack
WQ
Transporting mechanical energy
Chain, linkage, rotor, shaft, V-belt
WR
Conducting or guiding track-bound transport
equipment
Points, rails, railway, turntable
WS
Conducting or guiding pers ons
Catwalk, platf orm, stair
WJ … W K
(access equipment)
WT
WU … WY
WZ
Conducting or guiding mobile transport equipment
Path, road, shipping routes
Not used
---
Combined tasks
Examples:
-W A1
1. Busbar
-W E1
1. Earthing bar
-W G1
1. Control c able
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See Annex A for examples and rec ommendations
regarding the classification of busbars in high
voltage switchgears.
English translation. 2019-09-18
- 59 Table 2 -
(continued)
Main class X
Connecting objects
Code
Definition of subclass based on
characteristics of energy, signal, material or
component to be connected
Examples of components
XA
Not used
---
XB
Connecting high voltage objects
(> 1 000 V AC or > 1 500 V DC)
Terminal, junction box, socket, bushing,
cable sealing box
XC
Not used
---
XD
Connecting low voltage objects
(≤ 1 000 V AC or ≤ 1 500 V DC)
Connector, junction box, plug connector,
socket-outlet, terminal, terminal block,
terminal strip, cable sealing box
XE
Connecting to earth potential or reference
potential
Bonding terminal, earthing terminal,
shield c onnection 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 c arriers
Optical connection
Not used
---
XL
Connecting rigid enclosures for flows of
substances
Piping fitting, piping flange, piping
coupling
XM
Connecting flexible enclosures for flows of
substances
Hose c onnection, hos e c oupling
XN
Connecting objects for transport of mechanic al
energy, non-detachable
Rigid coupling
XP
Connecting objects for transport of mechanic al
energy, detachable
Control c oupling, disengaging c oupling
XQ
Connecting irreversible c onnected objects
Bonded connection, soldered connection,
welded connection
XR
Connecting reversible c onnected objects
Hook, lug
Not used
---
XJ … XK
XS … XY
XZ
Combined tasks
Examples:
-XB1
1. HV-clamp
-XG1
1. Socket for control c able
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- 60 -
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
Objects for main-process facilities
Objects for
common tasks
Code
Examples
Supervisory c ontrol system
Remote control units
Cable unit (top station level, c ompris es
single c able, classified in the sec ond
structure level with W in Table 1)
sub class
A
Objects for overall management of other
infrastructure objects
B
Installations with U n > 420 kV
C
Installations with 380 kV ≤ U n ≤ 420 kV
--
D
Installations with 220 kV ≤ U n < 380 kV
Tab. 4
E
Installations with 110 kV ≤ U n < 220 kV
Tab. 4
F
Installations with 60 kV ≤ U n < 110 kV
--
G
Installations with 45 kV ≤ U n < 60 kV
--
H
Installations with 30 kV ≤ U n < 45 kV
--
J
Installations with 20 kV ≤ U n < 30 kV
--
K
Installations with 10 kV ≤ U n < 20 kV
--
L
Installations with 6 kV ≤ U n < 10 kV
--
M
Installations with 1 kV ≤ U n < 6 kV
--
N
Installations with U n < 1 kV
Auxiliary power s ystem
P
Objects for potential equalization
Earthing s ystem
Lightning protection s ystem
Q, R, S
Objects not related to the main process
Object class definition
Tab. 1
applicable
Tab. 4
Tab. 4
--
---
--
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 s ocial
purposes or tasks
X
Objects for fulfilling auxiliary purposes or
tasks
Y
Objects for communication and information
tasks
Z
Objects for housing or enclosing technic al
systems or installations such as areas and
buildings
Garage
Office
Sanitary facilities
Air conditioning system
Alarm s ystem
Crane-s ystem
Electric power distribution
Fire protection s ystem
Gas-supply
Lighting installation
Security system
Sewage dispos al plant
W ater-supply
Computer network
Loudspeaker s ystem
Telephone s ystem
Video surveillance s ystem
Antenna system
Building
Aera
Fence
Railway line
Road
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---
Tab. 4
--
--
- 61 -
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 U n > 420 kV
Code
BA
Definition of subclass based on voltage range
U n ≥ 1000 kV
BB
BC
765 kV ≤ U n < 1000 kV
BD
BE
525 kV ≤ U n < 765 kV
BF
BG
420 kV ≤ U n < 525 kV
BH
BJ … BY
BZ
Combined voltage range
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- 62 Table 4 b)
Infrastructure objects, Class D acc. to Table 3
Installations with 220 kV ≤ Un < 380 kV
Code
DA
Definition of subclass based on voltage range
300 kV ≤ U n < 380 kV
DB
DC
250 kV ≤ U n < 300 kV
DD
DE
220 kV ≤ U n < 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
EA
Definition of subclass based on voltage range
180 kV ≤ U n < 220 kV
EB
EC
150 kV ≤ U n < 180 kV (nominal voltage 150 (154) kV)
ED
EE
132 kV ≤ U n < 150 kV (nominal voltage 132 (138) kV)
EF
EG
110 kV ≤ U n < 132 kV (nominal voltage 110 (115) kV)
EH
EJ … EY
EZ
Combined voltage range
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- 63 Table 4 d)
Infrastructure objects, Class N acc. to Table 3
Installations with U n < 1 kV (especially for auxiliary power distribution)
Code
NA
Definition of subclass based on voltage range
AC: U n > 400 V
NB … ND
NE
AC: U n ≤ 400 V
NF … NJ
NK
DC: U n ≥ 110 V
NL … NP
NQ
DC: 24 V < U n < 110 V
NR … NT
NU
DC: U n ≤ 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 s ystem
XC
Electric power distribution (light and power)
XD
W ater-supply
XE
Sewage dispos al plant
XF
Ventilation s ystem, smoke extraction system
XG
Oil leakage c ontainer, rain water collection s ystem
XH
Crane-s ystem
XJ … XY
XZ
Combined facilities
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- 64 -
Annex A
Examples
Table A.1: Recommended Classification of Switchgears in High- and M edium 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
IG EVU-001E: Designation and documentation – Part 1
© IG EVU 2005 – copyright – all rights reserved
-QZ …
English translation. 2019-09-18
- 65 Table A.2: Recommended Classification of M easuring Transformers
in High- and M edium Voltage Stations
Voltage transformer
1. Voltage transformer
-BA1
2. Voltage transformer
-BA2
freely available
-BA3, 4, 5
Voltage transformer at busbar s ection 1
-BA11, 12, 13, ...
Voltage transformer at busbar s ection 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
transformer)
-BC91, 92, 93, ...
Combined transformer
1. Combined transformer
-BZ1
2. Combined transformer
-BZ2
3. Combined transformer
-BZ3
4. Combined transformer
-BZ4
IG EVU-001E: Designation and documentation – Part 1
© IG EVU 2005 – copyright – all rights reserved
English translation. 2019-09-18
- 66 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
(old)
Reference identifier (new)
- Q0
Circuit breaker
1. Switch
-QA1
-Q01
2. Switch
-QA2
-Q02
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
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
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
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
Busbar system 1
Busbar system 2
Busbar system 3
Busbar system 4
Earthing switch general
-Q5
1. Earthing switch
-QC1
-Q51
2. Earthing switch
-QC2
-Q52
3. Earthing switch
-QC3
---
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 1
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
general
-QC9
-Q8
multiple earthing switches
-QC91, 92, ... 99
-Q81, Q82
Freely available;
for example: earthing switch for transformer star point
all not used numbers
E.g. -QC6
-Q6
Combined switch
-QZ …
---
Earthing switch for cables/OHL
IG EVU-001E: Designation and documentation – Part 1
© IG EVU 2005 – copyright – all rights reserved
English translation. 2019-09-18
- 67 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
IG EVU-001E: Designation and documentation – Part 1
© IG EVU 2005 – copyright – all rights reserved
English translation. 2019-09-18
- 68 coupler with bypass separated in 2 feeders
coupler with bypass in one feeder
feeder n
-QC11
-QC21
-QC31
feeder n+1
-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
bypass
-QB71
-QB72
-QC71
bypass
-QB71
-QB71
-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)
IG EVU-001E: Designation and documentation – Part 1
© IG EVU 2005 – copyright – all rights reserved
English translation. 2019-09-18
- 69 -
Figure A.4: Examples for Classification of Switchgears in Bays with Specialized
Busbars Arrangements
IG EVU-001E: Designation and documentation – Part 1
© IG EVU 2005 – copyright – all rights reserved
English translation. 2019-09-18