EDS 08-1113 Substation, Nomenclature and...

Document Number: EDS 08-1113

Version: 1.0

Date: 14/01/2018

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ENGINEERING DESIGN STANDARD

EDS 08-1113

SUBSTATION, NOMENCLATURE AND APPARATUS NAMING UP TO AND INCLUDING 132KV

Network(s): EPN, LPN, SPN

Summary: This engineering design standard sets out UK Power Networks approach to the naming of substations and circuits at all voltages.

Author: Colin Scoble Date: 14/01/2018

Approver: Barry Hatton Date: 13/02/2018

This document forms part of the Company’s Integrated Business System and its requirements are mandatory throughout UK Power Networks. Departure from these requirements may only be taken with the written approval of the Director of Asset Management. If you have any queries about this document please contact the author or owner of the current issue.

Applicable To

UK Power Networks External

☒ Asset Management ☒ G81 Website

☒ Capital Programme ☒ UK Power Networks Services

☒ Connections ☒ Contractors

☒ Health & Safety ☒ ICPs/IDNOs

☐ Legal ☐ Meter Operators

☒ Network Operations

☐ Procurement

☐ Strategy & Regulation

☒ Technical Training

Substation, Nomenclature and Apparatus Naming up to and including 132kV


Version: 1.0

Date: 14/01/2018

© UK Power Networks 2018 All rights reserved 2 of 29

Revision Record

Version 1.0 Review Date 13/02/2023

Date 20/11/2017 Author Colin Scoble

New harmonised engineering standard to define the approach taken for the naming of substations and circuits at all voltages. This standard supersedes all previous documents on this subject from all three legacy DNOs.

Version Review Date

Date Author



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Contents

1 Introduction ............................................................................................................. 5

2 Scope ....................................................................................................................... 5

3 Glossary and Abbreviations ................................................................................... 5

3.1 Definitions ................................................................................................................. 5

3.2 Abbreviations for Substation Names .......................................................................... 6

3.3 Abbreviations for Apparatus ...................................................................................... 7

4 General Requirements ............................................................................................ 9

5 Naming of Substations............................................................................................ 9

5.1 132kV, 66kV and EHV (Excludes Pole Mounted Apparatus see section 7.7) ............. 9

5.2 HV (Excludes Pole mounted Apparatus see section 7.7) ........................................... 9

6 Naming of Apparatus ............................................................................................ 10

6.1 132kV, 66kV and EHV Apparatus ............................................................................ 10

6.1.1 Naming of 132,66kV and EHV Circuits .................................................................... 10

6.1.2 Naming of 132,66kV and EHV Busbars ................................................................... 12

6.1.3 Naming of 132,66kV and EHV Transformers ........................................................... 12

6.1.4 Naming of 132, 66kV and EHV Reactive Compensation ......................................... 14

6.1.5 Naming of 132,66kV and EHV Free Standing Voltage and Current Transformers ... 14

6.2 HV Apparatus .......................................................................................................... 15

6.2.1 HV Apparatus (Primary Substations) ....................................................................... 15

6.2.2 HV Apparatus (Secondary Substations) .................................................................. 15

7 Asset Labelling ...................................................................................................... 17

7.1 General Requirements ............................................................................................ 17

7.2 Isolatable Switchgear .............................................................................................. 18

7.3 Non-Isolatable Switchgear ....................................................................................... 18

7.4 132kV and 66kV Apparatus and Plant ..................................................................... 18

7.4.1 132kV and 66kV Circuits Control and Protection cubicles........................................ 18

7.4.2 132kV and 66kV Transformers Control and Protection cubicles .............................. 19

7.4.3 132kV and 66kV Switchgear Nomenclature ............................................................. 19

7.5 EHV Apparatus ........................................................................................................ 23

7.5.1 EHV Transformer Incoming Circuits ........................................................................ 23

7.5.2 EHV Feeder Circuits ................................................................................................ 23

7.5.3 EHV Railway Circuits ............................................................................................... 23

7.5.4 EHV Bus Sections and Bus Couplers ...................................................................... 24

7.5.5 EHV Interconnectors ............................................................................................... 24

7.6 HV Apparatus (Ground Mounted) ............................................................................ 24



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7.6.1 HV Circuits .............................................................................................................. 24

7.6.2 HV Transformers ..................................................................................................... 27

7.7 Pole Mounted HV and EHV Apparatus .................................................................... 27

7.7.1 EHV Pole Mounted Apparatus ................................................................................. 27

7.7.2 HV Pole Mounted transformer sites ......................................................................... 28

7.7.3 HV Pole Mounted Apparatus (non transformer sites) ............................................... 28

7.8 LV Apparatus........................................................................................................... 29

8 References ............................................................................................................. 29

8.1 UK Power Networks Standards ............................................................................... 29

8.2 National and International Standards ....................................................................... 29



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1 Introduction

This Engineering Design Standard sets out UK Power Networks standard with regard to the following general requirements:

Naming of Substations;

Naming of Apparatus;

Asset Labelling Requirements.

2 Scope

This document applies to UK Power Networks assets in the three licensed areas (EPN, LPN and SPN) including apparatus and plant in shared UK Power Networks/Customer or National Grid locations.

With regards to UK Power Networks owned assets in the unregulated networks; this may be applied to private networks where appropriate.

3 Glossary and Abbreviations

3.1 Definitions

Term Definition

EHV Above 22kV but Less than 72kV Rated Equipment

Grid Substation A substation with an operating voltage of 132kV and may include transformation to 33kV, 22/20kV, 11kV or 6.6kV

HV Above 1kV but less than 22kV Rated equipment

LV Low Voltage. Refers to voltages up to 1000V AC (typically 400V 3-phase and 230V single-phase) and 1500V DC

Primary Substation A substation with an operating voltage of 33kV and may include transformation to 11kV,6.6kV or LV

Secondary Substation A substation with an operating voltage of 11kV or 6.6kV and may include transformation to 400V. Also termed ‘Distribution Substation’

UK Power Networks UK Power Networks (Operations) Ltd consists of three electricity distribution networks:

Eastern Power Networks plc (EPN).

London Power Network plc (LPN).

South Eastern Power Networks plc (SPN).



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3.2 Abbreviations for Substation Names

It is important that the substation name is recorded on the Control Diagram and in the Asset Management database. As there are restrictions on the total length that these systems can accommodate it is permitted to use the following abbreviations to keep the name within 50 characters

It is not acceptable to abbreviate the first word of the substation name.

Abbreviation Full Description

Ave Avenue

Br Bridge

Cres Crescent

Dr Drive

E East

Fm Farm

Gdns Gardens

Hse House

Ln Lane

Nth North

Pl Place

Rd Road

Sch School

St Street

Sth South

Terr Terrace

W West



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3.3 Abbreviations for Apparatus

In order to achieve consistency the following abbreviations should be applied to Apparatus when required and can be applied to asset labelling.

Abbreviation Apparatus

ABSD Air Break Switch Disconnector

ASC Arc Suppression Coil

ASL Automatic sectioning Links

AUX/ETX Auxiliary and earthing Transformer

AUX T Auxiliary Transformer

BC Bus Coupler

BS, MBS, RBS Bus Section (including Main and Reserve)

CSE Cable Sealing End

CB Circuit Breaker

COMP T Compensator Transformer

CT Current Transformer

DISC / ISOL Disconnector / Isolator

E SW Earth Switch

ET Earthing Transformer

FT Fault Thrower

GEN Generator

GEN T Generator Transformer

GT Grid Transformer

IND Inductor

(L) NER (Liquid) Neutral Earthing Resistor

MBB Main Busbar

MSC Mechanically Switched Capacitor

NER Neutral Earthing Resistor

OHL Overhead Line

QB Quadrature Booster

REAC Reactor

RBB Reserve Busbar

SER REAC Series Reactor

SH REAC Shunt Reactor

SVC Static Var Compensator

STN T Station Transformer

SGT Super Grid Transformer

SW DISC Switch Disconnector



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Abbreviation Apparatus

TCR Thyristor Controlled Reactor

TCSC Thyristor Controlled Series Capacitor

TSC Thyristor Switched Capacitor

VT / CVT / WVT Voltage Transformer / Capacitor VT / Wound VT

VT/CT Combined Voltage / Current Transformer



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4 General Requirements

It is a basic operational safety requirement that all substation sites, apparatus (Including circuits) and plant on the system can be identified unambiguously.

In order to achieve this all substation sites, apparatus, plant, and circuits shall be labelled in accordance with this standard.

Where the numbering and nomenclature of apparatus already installed on the network does not conform to this Standard then it should be amended at the first available opportunity (for example if a switchgear replacement is taking place at a substation).

Where, due to special layouts, the application of this Standard is not possible then the matter shall be referred to Asset Management.

Substations in all regions also have a unique identifier and this Standard does not omit the requirement for this unique numbering and should be included as a prefix to the substation name.

5 Naming of Substations

5.1 132kV, 66kV and EHV (Excludes Pole Mounted Apparatus see section 7.7)

As a general principle, within the same licence area, no 132kV, 66kV or EHV substation shall be given a name that could be confused with the name of any other substation on the system.

It is recognised there may be duplication across licence areas, but as far as practicable this should be avoided. Where unavoidable, then in the case of a 132kV, 66kV or EHV site the site name shall be suffixed uniquely.

Example:

Cobham (Kent)

Cobham (Surrey)

Finsbury Market A

Finsbury Market B

In urban areas where there are several substations in one town or parish, the sites are to be named by the road which gives normal access. Again suffixes are to be given to differentiate between substations at the same site.

5.2 HV (Excludes Pole mounted Apparatus see section 7.7)

As a general principle, within the same licence area, no HV substation shall be given a name that could be confused with the name of any other HV substation on the system.

It is recognised there may be duplication across licence areas given the significantly greater number of sites and common road names across the network area (e.g. High Street, London Road etc.). However, it is expected that the majority will be uniquely identifiable through the inclusion of the suffix in the name.



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For all sites, the following rules shall apply to minimise the risk of an operator going to the wrong location.

Wherever possible the name of the occupier should be avoided to prevent any confusion when locating the site.

Example:

“High Rd 3” should be used rather than “High Rd TESCO”

The site is to take its name from the road that gives normal access with a suffix to make the name unique.

Example:

The Meadows Workington

The Meadows Broomfield.

Where two switchboards are on the same site (i.e. access is through the same shared main access point or curtilage), then these shall be treated as part of the same site, share the site name. Busbars and Apparatus shall be uniquely identified as being part of the same site.

6 Naming of Apparatus

6.1 132kV, 66kV and EHV Apparatus

6.1.1 Naming of 132,66kV and EHV Circuits

The following rules should be applied to the naming of 132kV, 66kV and EHV Circuits concerning the circuit name when looking out from the circuit breaker or Isolater/Switch in priority number order:

1. Any CB or transformer or switch or isolator within the site; 2. Any s/s with a CB controlling the circuit at the same voltage with its circuit number or,

if more than one, an alphabetical list; 3. Any s/s with a transformer to a lower voltage with its circuit number (assumed to be

the transformer number) or, if more than one, an alphabetical list; 4. Then reducing this list to the first two (there are limited cases where three at most can

be included where naming is manual) with “tee” as separator and “Teed” as a suffix if there are more excluded.

Due to the 50 character limitation with various systems then this can be reduced to the first two names then the addition of “tee” or “Teed” as a suffix.

The naming of circuits connecting substations at different named sites shall be as follows:

A circuit connecting two substations shall be designated by the names of the substations concerned.

Example:

Dormansland - Three Bridges Main



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A circuit connecting three or more substations shall be designated by the names of all the substations concerned.

Example:

Braintree - Chelmsford North – Rayleigh.

A circuit connecting both a remote substation and transformer within the same curtilage (i.e. banked circuits) shall be designated by the local and remote locations followed by the local apparatus identifying name.

Example:

West Ham – Stephenson St (LUL) T3D – T3A/T3B/T3C.

Parallel circuits between the same substations shall be designated in accordance with the above requirements and shall be numbered uniquely

Example:

Beddington – Sydenham Park 1;

Beddington – Sydenham Park 2;

Back Hill - Longford Street - St Johns Wood 1;

Back Hill - Longford Street - St Johns Wood 2.

The identification of circuits connecting apparatus at the same voltage and at the same named site shall be as follows:

A single circuit shall be labelled ‘Interconnector’ and may be suffixed by the source and destination in the case of an interconnector linking two Busbar sections.

Example:

Interconnector 1-2 (linking Busbar Sections 1 and 2).

Where there are parallel interconnector circuits linking the same source and destination, these shall be identified by a unique circuit number

Example:

Interconnector 1;

Interconnector 2.

Interconnectors between differently named sites shall be identified as feeders and named and numbered accordingly.



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6.1.2 Naming of 132,66kV and EHV Busbars

The numbering and nomenclature of Busbars for use on all operational drawings shall be as follows:

Nominal Busbars volts (132kV, 66kV, 33kV etc.);

Busbars designation (Main Busbar, Reserve Busbar and Mesh Corner);

Busbar section number (1, 2, 3 etc.);

Sections of Busbars of the same nominal voltage and Busbar designation shall be numbered consecutively from one end of the substation to the other. Main and reserve Busbar shall have corresponding numbering.

In the case of a mesh type substation the corners of the mesh shall be numbered consecutively in an anti-clockwise direction when viewed from above. The Mesh Corner numbering shall also match the Transformer numbers associated with it.

There shall be no requirement to label Busbars on site. Positive identification on site shall be by reference to Apparatus connected to the relevant Busbar.

Example:

132kV Main Busbar 1;

132kV Reserve Busbar 1;

33kV Main Busbar 2;

33kV Reserve Busbar 2.

The first section of Busbar in a substation will be Busbar 1 the next section will be Busbar 2. Any further Busbar sections added will be sequenced out in following way:

Extensions to Busbar section 1 will become Busbar section 3, Busbar section 5 etc… Extensions to Busbar section 2 will become Busbar section 4, Busbar section 6 etc…

6.1.3 Naming of 132,66kV and EHV Transformers

The numbering and nomenclature of transformers installed in all sites shall be as follows:

The identification of all Transformers, except earthing Transformers, Shall include a prefix indicating the ratio of the nominal voltages.

A transformer with a nominal primary voltage of 132kV or 66kV which connects with a lower voltage system shall be designated a Grid Transformer. All such transformers shall be numbered uniquely in relation to each other and to any other transformers.

Example:

132/33kV GT1;

132/33kV GT2.



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All other transformers at a particular site shall be designated the letter T and shall be numbered uniquely.

Example:

33/11kV T1;

33/11kV T2.

Where two or more transformers in a substation are banked on a circuit breaker on either the primary voltage or secondary voltage side the individual transformers shall have the same number and be identified by the addition of consecutive capital letters as a suffix

Example:

132/33kV GT1A;

132/33kV GT1B.

A transformer providing a system neutral connection and not supplying auxiliaries shall bear the designation and number of the transformer to which it is connected followed by the voltage the winding to which the transformer is connected and the words EARTHING TRANSFORMER

Example:

GT1 33kV EARTHING TRANSFORMER;

GT2 33kV EARTHING TRANSFORMER;

GT1A1 33kV EARTHING TRANSFORMER;

GT1A2 33kV EARTHING TRANSFORMER.

A transformer supplying local auxiliaries and not providing a neutral connection shall bear the designation and number of the transformer to which it is connected, and the voltage ratio of the auxiliary transformer, followed by the words AUXILIARY TRANSFORMER

Example:

GT1 11/0.4kV AUXILIARY TRANSFORMER

GT2 11/0.4kV AUXILIARY TRANSFORMER

GT1A1 11/0.4kV AUXILIARY TRANSFORMER

GT1A2 11/0.4kV AUXILIARY TRANSFORMER

A transformer supplying auxiliaries to a separate site and not providing a system neutral connection shall bear the designation and number of the transformer to which it is connected, and the voltage ratio of the auxiliary transformer, followed by the words SITE AUXILIARY TRANSFORMER

Example:

GT1 33/0.4kV SITE AUXILIARY TRANSFORMER

GT2 33/0.4kV SITE AUXILIARY TRANSFORMER



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6.1.4 Naming of 132, 66kV and EHV Reactive Compensation

The naming of reactors and capacitors shall be as follows:

The word REACTOR or CAPACITOR preceded by an appropriate adjective such as Series Reactor, Static Capacitor;

A suffix conventionally taken as numerical.

In the case of a reactor connected to a transformer tertiary winding this number shall be the number of the associated transformer. If the associated transformer is a banked transformer then the appropriate letter shall also be included, In other cases this number shall be a sequential number;

Where two items qualify for the same number and nomenclature then the word, WINDING shall be added to the reactor nomenclature followed by an identification letter. Similarly the word BANK shall be added to capacitor nomenclature followed by an identification letter

Example:

13kV Shunt Reactor 4B Winding A;

13kV Shunt Reactor 2A Winding B.

6.1.5 Naming of 132,66kV and EHV Free Standing Voltage and Current Transformers

The nomenclature of freestanding voltage and current transformers shall be as follows:

The designation and number of the associated apparatus or circuit;

The nominal voltage;

The words VT, CT or CVT as appropriate;

Phase identification where applicable for phase segregated units (Phase colour plates are acceptable).

Example:

NORTHFLEET EAST 1 132kV VT RED PHASE



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6.2 HV Apparatus

The following rules should be applied to the naming of HV Circuits concerning the circuit name when looking out from the circuit breaker or Switch in priority number order:

1. Any circuit breaker, switch or Transformer within the same site; 2. Any Primary S/Stn (If more than one then in Alphabetical order); 3. Any Secondary S/Stn on the main circuit (If more than one then in Alphabetical order); 4. Any Secondary S/Stn on a spur (If more than one then in Alphabetical order).

Due to the 50 Character limitation with various systems then this can be reduced to the first two names then the addition of “tee” or “Teed” as a suffix.

6.2.1 HV Apparatus (Primary Substations)

HV Apparatus within a primary substation should follow the same principles of section 6.1.1 for circuits with the exception that the use of the word “teed” or “tee’s” within the circuit name is acceptable following the principle in section 6.2.2 below.

For HV Busbars in Primary substations then the requirements of section 6.1.2 should be followed.

6.2.2 HV Apparatus (Secondary Substations)

The identification of circuits at HV within a Secondary substation should follow the same principles 6.1.1, or as a minimum ensure the presence of a teed substation is stated.

For example:

HIGH ST EAST ST

The label at HIGH STREET shall read East Street

The label at EAST STREET shall read High Street



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For circuits with three ends, all should be identified, for example the arrangement below should preferably be shown as High Street – East Street – South Street.

Where it is not practicable to state all circuit ends then the use of the words Tee(s) or tee(s) may be used.

In this instance, the preferred approach using the above example is to describe the circuit as High Street to East Street Teed where the second identified site is the main line substation. The use of the word Tee or Teed may only be used if it does not introduce ambiguity as to the identification of the circuit.

HIGH ST EAST ST

SOUTH ST

For circuits with more than three ends, ideally the full circuit name should be stated, but given the practicality of doing so, it is acceptable to use the words Tee(s) or tee(s) in line with the above approach provided this again does not introduce ambiguity or confusion as to the correct circuit.



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7 Asset Labelling

7.1 General Requirements

Labels must be fitted to all parts of apparatus or plant where work (including inspections) may take place to ensure there can be no confusion as to the identity of the apparatus or equipment in accordance with the following general requirements:

Permanent labels must be ordered in sufficient time to ensure that they are available before the equipment is energised. Where possible, circuit inscriptions should be confirmed at the planning stage and where this is the case, for equipment supplied with labels the inscription should be detailed when placing the order.

As good practice the inscribed label should show the circuit ends in alphabetical order where they are fully stated and not covered by the use of the words Teed or Tees.

Permanent labels shall be fitted prior to energisation (including following network changes which would affect circuit designations), and must be checked as being correct and permanently and securely fixed in their appropriate positions at the time of energisation. They must be maintained for as long as the circuit exists in the form in which it was commissioned.

Circuit labels must be positioned so that it is clear to which circuit, and circuit control they refer, and so that at least one label can be clearly seen by the operator when positioned at the circuit operating controls.

Labels shall, unless otherwise specified, be of engraved Black Text on white background, exterior quality laminated material that is durable and legible. If, by design of the equipment, it is not practicable to use an engraved label then the details are to be applied using a permanent stencilling method (black letters on a white background) or a durable printed label approved by UK Power Networks.

Inscriptions must be comprehensive and precise. Unadorned capital letters and Arabic numerals shall be used exclusively.

Labels shall not be fixed to lids, covers, doors or any other part that may easily be removed and replaced in the incorrect location.

Where a busbar cable end box is fitted a label shall be fitted on the cable box showing the circuit details.

Where facilities are provided, or where the switchboard comprises two or more units, an additional label shall be fitted at the rear of each switch.

Where switchgear is remotely controlled, a label shall be fitted at the control position that replicates the label on the switchgear.

Labels that replicate the label on the switch, shall be fixed to auxiliary panels, remote protection equipment and multicore cable boxes.

Labels, that replicate the label on the switchgear, shall be fixed to auxiliary panels, remote protection equipment and multicore cable boxes.

If a circuit label is found to be misleading or inadequate, it must be replaced to comply with this Standard.

The appropriate Control Engineer must be informed when the wording on a circuit label is changed.



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7.2 Isolatable Switchgear

A label shall be fitted in a conspicuous position, on each individual fixed portion that clearly identifies the circuit controlled or panel number where facilities are provided and it is practicable to do so, a label shall be fitted to the rear of the fixed portion and A label shall be fitted on the isolatable portion of the switchgear. Where a busbar cable end box is fitted, a label shall be fitted on the isolatable portion of the switchgear.

Where an isolatable circuit-breaker is installed to supply a customer, and a standard supply configuration is adopted, i.e. the bus bars are UK Power Networks’ side and the feeder spouts supply the customer, then the bus bar and feeder spouts shall be labelled “UKPN” and “CUSTOMER” respectively.

Example:

BUSBARS on the Busbar Shutters - UKPN (White on Red)

FEEDER on the Feeder Shutters - CUSTOMER (Black on Yellow)

The stencilled lettering shall be at least 35mm high.

7.3 Non-Isolatable Switchgear

A label shall be fitted in a conspicuous position, on each individual switch that clearly identifies the circuit controlled.

Labels shall not be fixed to lids or any other part that may easily be removed.

Where facilities are provided, or where the switchboard comprises more than three units, an additional label shall be fitted at the rear of each switch.

Where a busbar cable end box is fitted a label shall be fitted on the cable box showing the circuit details.

Where switchgear is remotely controlled, a label shall be fitted at the control position that replicates the label on the switchgear.

Labels, that replicate the label on the switch, shall be fixed to auxiliary panels, remote protection equipment and multicore cable boxes.

7.4 132kV and 66kV Apparatus and Plant

7.4.1 132kV and 66kV Circuits Control and Protection cubicles

Switchgear control, protection apparatus and metering panels associated with a circuit shall be labelled in accordance with Section 6.1.1 and 6.1.2, except that the name of the substation at which the panel is located shall be omitted

Example:

At Three Bridges on the Bolney - Horsham 2 & 3 circuits the labels would read “Bolney - Horsham 2” and “Bolney - Horsham 3”



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At substations where a transformer circuit breaker, or some other means of isolation, acts as the termination of a line circuit the HV and LV relay panels shall include the circuit designation in the same format as above

Example:

At Ridham Dock the label would read “Kemsley / Sheerness Steelworks 132kV Relay panel” and “Kemsley / Sheerness Steelworks 33kV relay panel”

7.4.2 132kV and 66kV Transformers Control and Protection cubicles

Switchgear control, protection apparatus and metering panels associated with a transformer shall be labelled in accordance with Section 6.1.3, where the use of the full identification is impractical the voltage ratio prefix may be omitted for example “Grid Transformer 2”.

Each control handle shall have a label adjacent to it designating the apparatus it controls (e.g. 180).

HV and LV relay panel labelling for a typical 132/33kV Grid Transformer shall be:

Grid Transformer 1 132kV Relay Panel:

Grid Transformer 1 33kV Relay Panel.

7.4.3 132kV and 66kV Switchgear Nomenclature

Each item of 132kV and 66kV switchgear shall be identified by a 3 digit numbering system.

The first digit of the identification number denotes the sequence of switch groups in accordance with the following:

For transformer circuits, the first digit shall be the number of the transformer or transformer bank;

Switch groups shall be numbered from the end of the substation that is designed not to be extended. If a substation is designed such that it may be extended in both directions then the switch groups on one side of the substation shall be odd numbers and those on the other side shall be even numbers. In this situation the numbering shall commence from a sectioning or other convenient point;

Bus coupler and bus section switches shall be related to the busbars sections they connect, e.g. the bus coupler between main and reserve bars in section 1 shall be numbered Bus Coupler 1. The bus section switches connecting number 1 and number 2 Busbars and number 2 and number 3 busbars shall be numbered Bus Section 1 and Bus Section 2 respectively;

Where the same switchgear controls a line and a local transformer then the line number shall apply to the controlling switch.



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The second digit shall denote the class of switch group in accordance with Table 7-1 below:

Table 7-1

Digit Apparatus/Equipment

0 Circuit Breaker (excluding line CB’s)

Circuit Breaker (second choice line)

Circuit Breaker (associated with main Busbar on double switched equipment)

Switch Disconnector/Isolators (lines)

1 Earthing Switch

2 By pass Disconnector/Isolator

3 Circuit Disconnector/Isolator

4 Main Busbar Disconnector/Isolator

5 Circuit Breaker (associated with reserve Busbar on double switched equipment)

Switch Disconnector/Isolator (excluding lines)

6 Reserve Busbar Disconnector/Isolator

Mesh Opening Corner Disconnector/Isolator

7 Circuit Breaker Disconnector/Isolator, Busbar side

8 Main Busbar Disconnector/Isolator (second choice)

9 Reactor Tie Busbar Disconnector/Isolator

Reserve Busbar Disconnector/Isolator (second choice)

Table 7-2

Digit Equipment

0 Line

1 High Voltage Side of Transformer

2 Main Busbar Section

Mesh Busbar Section

Interconnector Within Substation

3 Bus coupler

4 Static Series Compensators (reactors, capacitors etc.)

5 Static Shunt Compensators (reactors, capacitors etc.)

6 Reserve Busbar section

7 Spare

8 Low Voltage Side of Transformer

9 Generator

Synchronous Compensator



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To illustrate the application of the numbering system, consider switch 120. To determine a description of the switch it is best to consider the number in the reverse order:

0 = circuit breaker (Table 7-1);

2 = main Busbar section (Table 7-2);

1 = connects Busbar sections 1 & 2

Thus, switch 120 is a circuit breaker connecting main Busbar sections 1 & 2

As a second example, consider switch 201.

1 = earthing switch (Table 7-1);

0= line (Table 7-2);

2= switch group

Thus, switch 201 is an earthing switch on line 2.

Switch components associated with sulphur hexafluoride insulated metal enclosed switchgear (GIS) shall be numbered according to the principles contained in this instruction.

Where more than one earthing switch qualifies for a particular number, then the number shall be suffixed by a unique consecutive letter.

The letters shall commence from the circuit termination inwards to the busbar selector disconnector.

In the case of busbar earthing switches such numbering shall run from the end of the substation that is not designed to be extended or if the substation is to be extended from both directions, starting from a central or bus-sectioning point.

Where two or more earthing switches are associated with a banked circuit which is already identified by use of a letter suffix, the earthing switches shall be further identified by use of an additional number suffix.

Example:

111A (for an earthing device associated with a banked transformer circuit).

Where equipment is used, which can perform the duties of both a disconnector and earth switch then the earthing device should be identified as the disconnector followed by a suffix of “ED”.

Example:

116ED (for an earthing device associated with Disconnector 116).



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Where a fault thrower is fitted for the protection of a transformer, the nomenclature shall be as follows:

The designation and number of the associated transformer;

The words FAULT THROWER (e.g. Grid Transformer 1 Fault Thrower);

The identifying number shall consist of the prefix FT followed by the identification number of the transformer (e.g. FT2A for Grid Transformer 2A);

Example:

GRID T1 FAULT THROWER FT1.

The nomenclature of neutral earthing switches shall be the designation and number of the associated apparatus followed by the words NEUTRAL EARTHING SWITCH.

The numbering of common neutral earthing switchgear shall be as follows:

The first part shall be a letter to denote the type of circuit with which the switchgear is associated as given below:

M – Generator;

T – Transformer;

P - Petersen Coil (Arc Supp. Coil);

S – Section;

R - Neutral Resistor, Neutral Reactor or Neutral Earthing Point.

The second part shall be the number of the circuit.

The third part shall be the letter N to denote the neutral earthing function.

The fourth part shall be a sequence number, 0 being reserved for neutral circuit breakers.

Example:

P2N1 NEUTRAL EARTH SWITCH.

The nomenclature of neutral earthing resistors shall be the designation and number of its associated apparatus followed by the words NEUTRAL EARTHING RESISTOR

Example:

GRID T1 NEUTRAL EARTHING RESISTOR;

GRID 1A1 NEUTRAL EARTHING RESISTOR;

GRID 1A2 NEUTRAL EARTHING RESISTOR.

Where the neutral earthing resistor is common to more than one item of apparatus it shall be designated COMMON NEUTRAL EARTHING RESISTOR followed where appropriate by a unique sequence number.

Where, due to special layouts, direct application of this instruction is not possible then the numbering and nomenclature shall be agreed with Asset Management.



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7.5 EHV Apparatus

7.5.1 EHV Transformer Incoming Circuits

The numbering of the circuit breaker on the secondary side of a Grid Transformer shall be GRID followed by the number and letter, if any, of the transformer.

Example:

GRID 1;

GRID 2.

In the case of transformers having two or more low voltage circuit breakers, these shall be identified uniquely as follows:

Example:

GRID 1A;

GRID 1B.

In the case of a transformer having a number and letter, by the addition of consecutive letters or other suitable qualification

Example:

GRID T1B1;

GRID T1B North;

GRID T1B2;

GRID T1B South.

7.5.2 EHV Feeder Circuits

Switchgear associated with feeder circuits shall be labelled by reference to all the terminations of the circuit, excepting the location of the switchgear, including in the case of parallel circuits, the appropriate number.

7.5.3 EHV Railway Circuits

Circuit Breakers associated with Railway Circuits shall be labelled as follows:

RAILWAY F <Railway circuit identification number> Example:

RAILWAY F1081

The Railway Asset owner shall be responsible for supplying the Circuit Identification Number.



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7.5.4 EHV Bus Sections and Bus Couplers

The numbering and nomenclature of busbar section, busbar coupler and busbar interconnector circuit breakers shall be as follows:

Circuit Breakers provided for coupling top and bottom, or front and rear, Busbars shall be labelled BUS COUPLER;

Circuit Breakers provided for Sectioning a Busbar shall be labelled BUS SECTION followed by the adjacent section numbers (e.g. Bus Section 1 / 2).

7.5.5 EHV Interconnectors

Switchgear provided for connecting remote sections of a Busbar shall be named INTERCONNECTOR preceded by the nominal voltage and followed by the Busbar number(s) adjacent to the switch concerned and then by the Busbar number(s) at the remote end

Example:

33kV INTERCONNECTOR 1 / 2.

7.6 HV Apparatus (Ground Mounted)

7.6.1 HV Circuits

All labels shall contain sufficient information so that equipment may readily be identified to avoid the operator being at the wrong location.

Where space permits, the names of ALL circuits and/or equipment shall be shown on labels.

Example:

HIGH ST EAST ST

SOUTH ST (teed site, not on the main circuit)

For circuits with three or more ends, preferably all should be identified, for example the arrangement above should preferably be shown as follows:

The label at High Street should read “East Street Teed South Street”.

The label at East Street should read “High Street Teed South Street”.

Again as for the circuit description, the remote ends should be shown in alphabetical order.

Where it is not practicable to state all circuit ends then the use of the words Tee(s) or tee(s) may be used.

In this instance, the preferred approach using the example below is to label the circuit at High Street as “East Street & Tee” where the second identified site is the main line substation. The use of the word Tee or Teed may only be used if it does not introduce ambiguity as to the identification of the circuit.



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The label at the ‘tee’ substation shall normally show the name of the substations on the major circuit.

Where more than one ‘tee’ is connected to the circuit the label shall normally show the name of the major circuit followed where possible by the name of each ‘tee’.

If insufficient space is available on the label it is permissible to include the name of only one tee followed by the words ‘& Tee’.

NORTH ST

HIGH ST EAST ST

SOUTH ST

The label at HIGH ST shall read East St Tee South St Tee North St, or if insufficient space available on the label, East Street Tee South Street & Tee is acceptable. If the name of neither tee can be accommodated then as a last resort East Street & Tees may be used.

Where more than one major circuit is involved in a teed circuit then the label shall contain the names of all major circuits followed by the words ‘& tee’.

HIGH ST EAST ST

Acacia Ave

SOUTH ST

The label at HIGH ST shall read: East St Tee South St Tee Acacia Avenue.

Or, if insufficient Space East Street Tee South Street & Tee.



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Where dual circuits exist, i.e. the labels for each circuit would be identical, as well as the substation/equipment name then a unique number shall be suffixed.

HIGH ST EAST ST

The label at HIGH STREET shall read East St No. 1 or East St No. 2

At sites containing more than one switchboard:

To identify separate items of switchgear in a distribution substation e.g. two Ring Main Units or Network CB and Ring Main Unit, each item shall be referred to as a switchboard and labelled accordingly e.g. SWBD 1, SWBD 2.1

Example 1

Label on SWBD 1 to read SWBD 2

Label on SWBD 2 to read SWBD 1

1 For ring main units and free standing switch/circuit-breakers, one label will suffice but for extensible switchboards

it may be necessary to repeat the label, e.g. Switchboard 1, on each switch.

No 1

No 2

WEST STREET

124

T1 T2

SWBD 1 SWBD 2



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Example 2

7.6.2 HV Transformers

At HV substations, transformers shall be labelled T1, T2 etc. When only one transformer is installed at site, it is not a requirement to fix an identifying label to the transformer.

7.7 Pole Mounted HV and EHV Apparatus

A label shall be fitted to all poles or towers identifying the apparatus on the pole or tower. All such labels shall be fixed in such a position that they are clearly visible and can be read by an operator of the apparatus.

For pole mounted switchgear the site name should include the apparatus type (ABSD, Recloser, Fuses, Links, ASL’s etc.) to allow adjacent items of apparatus to have site names differentiated only or mainly by that name, rather than relying on pole numbers. Pole number labels shall be fixed to the pole but the pole number should not be part of the site name.

In those situations where a support has more than one item of equipment then a separate label shall be fitted. For Pole mounted switchgear with accessible operating handles then the labels shall be fixed adjacent to the appropriate operating handle

7.7.1 EHV Pole Mounted Apparatus

When naming EHV apparatus outside of primary substations, typically 33kV ABSD’s or pole mounted reclosers, you should consider both the geographic location and the electrical circuit controlled by the device. The location name should not include the pole number, and should be unique without it.

THE RISE

5678

SWBD 1

SWBD 2

The label on SWBD1 towards SWBD2 to read Switchboard 2



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On single circuits and in locations with no other apparatus a simple geographic name with the parish suffix will suffice. If a unique identifier is, available as per section 4 then this number can be used as a prefix and there is no requirement for the Parish Suffix.

Example:

EDLESBORO HILL ABSD (EATON BRAY);

0G8252 - MILLFIELD SOLAR FARM ABSD;

008241 - WITTERSHAM HAM GREEN RECLOSER;

008306 - MOATLANDS FARM ZONE ABSD.

In other cases the name should define its location, the circuit destination and the circuit number.

Example:

0G7207 - LANGLEY PLACE - GOOSEBERRY GRN NO.1 ABSD;

0G7205 - LANGLEY PLACE - GOOSEBERRY GRN NO.2 ABSD.

7.7.2 HV Pole Mounted transformer sites

Names for pole mounted transformers should reflect where they are geographically and what they supply with a Town/Parish suffix as required. The location name should not include the pole number, and should be unique without it.

7.7.3 HV Pole Mounted Apparatus (non transformer sites)

When naming HV apparatus outside of primary substations, typically 33kV ABSD’s or pole mounted reclosers, you should consider both the geographic location and the electrical circuit controlled by the device.

The location name should not include the pole number, and should be unique without it. If it is controlling a spur then it can be named relative to the next transformer on the spur with a part suffix of SPUR (as below). On single circuits and in locations with no other apparatus a simple geographic name (with Parish suffix if required) will suffice.

Example:

KEYS GREEN RECLOSER (BRENCHLEY);

SUMMERFORD ASL (BRENCHLEY);

BRICKWORKS SPUR ABSD (HELMINGHAM);

BLUE BELL FARM SPUR ABSD (FRAMSDEN).



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Where there are multiple sites nearby then use of either location and circuit names (as on EHV above); a defining number / letter or some other suffix.

Example:

BOXTED TO WICKHAMBROOK ABSD (BOXTED);

BOXTED TO HARTEST NORTH ABSD (BOXTED);

DOG IN A DOUBLET NO1 ABSD (WHITTLESEY);

HALFWAY HOUSE B ABSD (WEST HORNDON);

HALFWAY HOUSE A ABSD (WEST HORNDON);

FOLLIES ESTATE SOUTHEAST ABSD (COPDOCK);

FOLLIES ESTATE NORTH ABSD (COPDOCK);

FOLLIES ESTATE SOUTHWEST ABSD (COPDOCK).

7.8 LV Apparatus

Each fuse way on an LV fuse board shall be clearly labelled to identify the circuit connected to that particular fuse way. The label is to show the next switching point or the area/address supplied. Where there could be some confusion about circuit identification, for example on a new housing estate, then a suitable geographic plan showing circuit arrangements shall be left on site. This plan should be marked as “For guidance only – Not accurate after - XX/XX/XXXX (Date of installation).” As soon as the LV circuits can be adequately identified the fuse ways must be permanently labelled with the appropriate designations.

Outgoing ways of each transformer LV board, freestanding pillar, take off chamber shall be labelled.

Underground disconnection boxes shall preferably also be labelled or provided with a unique number or alpha-numeric identifier. The identifying number shall be provided in accordance with EDS 12-0038 ‘Numbering of Link Boxes’.

Regardless of whether or not there is a unique identifier or encapsulated copy of a section of the LV geo-schematic network in the link box, it is the responsibility of the operator to satisfy themselves that they are at the correct location through the examination of up to date records.

8 References

8.1 UK Power Networks Standards

EDS 12-0038 Numbering of Link Boxes

EDS 09-0019 Safety Sign and Identification Labelling of Equipment

8.2 National and International Standards

The Grid Code OC11 - NUMBERING AND NOMENCLATURE OF HIGH VOLTAGE APPARATUS AT CERTAIN SITES

The Distribution Code

DOC11 - NUMBERING AND NOMENCLATURE OF ELECTRICAL APPARATUS AT OWNERSHIP BOUNDARIES

TP109 Numbering and Nomenclature of HV Apparatus (National Grid Standard)

EDS 08-1113 Substation, Nomenclature and...

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