High-voltage switchgear and controlgear - Part 108: High-voltage alternating current disconnecting circuit-breakers for rated voltages above 52 kV

IEC 62271-108:2020 applies to high-voltage alternating current disconnecting circuit-breakers for operation at frequencies of 50 Hz and 60 Hz on systems having voltages above 52 kV.
This second edition cancels and replaces the first edition published in 2005. This edition contains the following significant technical changes with respect to the previous edition:
- The document has been restructured according to IEC 62271-1:2017.
- The document has been adapted to some of the changes introduced in IEC 62271-100:–[1].
- The document has been adapted to some of the changes introduced in IEC 62271-102:2018.
- References have been reviewed and updated.
- Some definitions have been reviewed and adapted to the latest IEV editions.
- Rated static terminal load and static terminal load test have been removed and a design requirement for static mechanical loads has been included.
- Additional type tests for auxiliary and control circuits have been included.
- X-radiation test procedure for vacuum interrupters has been included.
- Type test for testing of interlocking device and type test for testing of temporary mechanical locking devices have been included.
- Special requirements for making and breaking tests on class E2 disconnecting circuit-breakers have been removed.
[1] Under preparation. Stage at the time of publication: IEC CDV 62271-100:2020.

Appareillage à haute tension - Partie 108: Disjoncteurs-sectionneurs à courant alternatif à haute tension de tensions assignées supérieures ou égales à 52 kV

L'IEC 62271-108:2020 s'applique aux disjoncteurs-sectionneurs à courant alternatif à haute tension fonctionnant à des fréquences de 50 Hz et 60 Hz sur des systèmes de tensions assignées supérieures à 52 kV.
Cette deuxième édition annule et remplace la première édition parue en 2005. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
- le document a été restructuré conformément à l'IEC 62271-1:2017;
- le document a été adapté à certaines des modifications introduites dans
- l'IEC 62271‑100:–[1];
- le document a été adapté à certaines des modifications introduites dans l'IEC 62271‑102:2018;
- les références ont été révisées et mises à jour;
- certaines définitions ont été révisées et adaptées aux dernières éditions de l'IEV;
- l'effort statique assigné sur les bornes et l'essai d'efforts statiques sur les bornes ont été supprimés et une exigence de conception pour les charges mécaniques statiques a été ajoutée;
- des essais de type complémentaires ont été ajoutés pour les circuits auxiliaires et de commande;
- une procédure d'essai de rayonnement X a été ajoutée pour les interrupteurs à vide;
- des essais de type ont été ajoutés pour le dispositif de verrouillage et les dispositifs de verrouillage mécanique temporaire;
- les exigences spéciales pour les essais d'établissement et de coupure des disjoncteurs‑sectionneurs de classe E2 ont été supprimées.
[1] En cours d'élaboration. Stade au moment de la publication: IEC CDV 62271-100:2020.

General Information

Status
Published
Publication Date
08-Jul-2020
Technical Committee
Current Stage
PPUB - Publication issued
Completion Date
09-Jul-2020
Ref Project

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IEC 62271-108
Edition 2.0 2020-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
High-voltage switchgear and controlgear –
Part 108: High-voltage alternating current disconnecting circuit-breakers for
rated voltages above 52 kV
Appareillage à haute tension –
Partie 108: Disjoncteurs-sectionneurs à courant alternatif à haute tension
de tensions assignées supérieures à 52 kV
IEC 62271-108:2020-07(en-fr)
---------------------- Page: 1 ----------------------
THIS PUBLICATION IS COPYRIGHT PROTECTED
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---------------------- Page: 2 ----------------------
IEC 62271-108
Edition 2.0 2020-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
High-voltage switchgear and controlgear –
Part 108: High-voltage alternating current disconnecting circuit-breakers for
rated voltages above 52 kV
Appareillage à haute tension –
Partie 108: Disjoncteurs-sectionneurs à courant alternatif à haute tension
de tensions assignées supérieures à 52 kV
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.130.10 ISBN 978-2-8322-8507-7

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – IEC 62271-108:2020 © IEC 2020
CONTENTS

FOREWORD ........................................................................................................................... 4

1 Scope .............................................................................................................................. 6

2 Normative references ...................................................................................................... 6

3 Terms and definitions ...................................................................................................... 6

3.1 General terms and definitions ................................................................................. 7

3.2 Assemblies of switchgear and controlgear .............................................................. 7

3.3 Parts of assemblies ................................................................................................ 7

3.4 Switching devices ................................................................................................... 7

3.5 Parts of switchgear and controlgear ........................................................................ 7

3.6 Operational characteristics of switchgear and controlgear ....................................... 7

3.7 Characteristic quantities ......................................................................................... 8

3.8 Index of definitions .................................................................................................. 8

4 Normal and special service conditions ............................................................................. 9

5 Ratings ............................................................................................................................ 9

5.1 General ................................................................................................................... 9

5.3 Rated insulation level (U , U , U ) ......................................................................... 9

d p s

6 Design and construction .................................................................................................. 9

6.1 General ................................................................................................................... 9

6.11 Nameplates............................................................................................................. 9

6.12 Locking devices .................................................................................................... 10

6.13 Position indication ................................................................................................. 10

6.101 Requirements for simultaneity of poles during single closing and single

opening operations ............................................................................................... 10

6.102 Operation of disconnecting circuit-breakers .......................................................... 10

6.103 Pressure limits of fluids for operation .................................................................... 10

6.104 Vent outlets .......................................................................................................... 10

6.105 Time quantities ..................................................................................................... 10

6.106 Static mechanical loads ........................................................................................ 11

6.107 Disconnecting circuit-breaker classification ........................................................... 11

6.108 Requirements in respect of the isolating distance of disconnecting circuit-

breakers ............................................................................................................... 11

7 Type tests ..................................................................................................................... 11

7.1 General ................................................................................................................. 11

7.2 Dielectric tests ...................................................................................................... 11

7.3 Radio interference voltage (RIV) test .................................................................... 11

7.4 Resistance measurement ...................................................................................... 11

7.5 Continuous current tests ....................................................................................... 11

7.6 Short-time withstand current and peak withstand current tests .............................. 12

7.7 Verification of the protection ................................................................................. 12

7.8 Tightness tests ..................................................................................................... 12

7.9 Electromagnetic compatibility tests (EMC) ............................................................ 12

7.10 Additional tests on auxiliary and control circuits .................................................... 12

7.11 X-radiation for vacuum interrupters ....................................................................... 12

7.101 Mechanical and environmental tests ..................................................................... 12

7.102 Miscellaneous provisions for making and breaking tests ....................................... 13

7.103 General considerations for making and breaking tests .......................................... 13

---------------------- Page: 4 ----------------------
IEC 62271-108:2020 © IEC 2020 – 3 –

7.104 Demonstration of arcing times ............................................................................... 13

7.105 Short-circuit test quantities ................................................................................... 13

7.106 Short-circuit test procedure ................................................................................... 13

7.107 Terminal fault tests ............................................................................................... 13

7.108 Additional short-circuit tests .................................................................................. 13

7.109 Short-line fault tests .............................................................................................. 13

7.110 Out-of-phase making and breaking tests ............................................................... 13

7.111 Capacitive current tests ........................................................................................ 14

7.112 Tests to verify the proper function of the position indicating device ....................... 14

7.113 Combined function test ......................................................................................... 14

8 Routine tests ................................................................................................................. 18

8.1 General ................................................................................................................. 18

9 Guide to the selection of disconnecting circuit-breakers (informative) ............................ 18

10 Information to be given with enquires, tenders and orders (informative) ......................... 18

11 Transport, storage, installation, operation instructions and maintenance........................ 19

12 Safety ............................................................................................................................ 19

13 Influence of the product on the environment .................................................................. 19

Annex A (informative) Explanatory notes and examples of disconnecting circuit-

breakers ............................................................................................................................... 20

Bibliography .......................................................................................................................... 21

Figure 1 – Test sequence for mechanical operations and short-circuit combined

function tests when performed as separate tests ................................................................... 15

Figure 2 – Test sequence for mechanical operations and short-circuit combined

function tests when performed in one sequence .................................................................... 16

Figure A.1 – A making or breaking unit (or several identical units connected in series)

which satisfies the dielectric requirements of a disconnector ................................................. 20

Figure A.2 – Device with a single gap which is divided into a making or breaking

section and an isolating section ............................................................................................ 20

Figure A.3 – Circuit-breaker which, together with a series connected disconnector,

commonly satisfies the dielectric requirements of a disconnector in open position ................ 20

---------------------- Page: 5 ----------------------
– 4 – IEC 62271-108:2020 © IEC 2020
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
HIGH-VOLTAGE SWITCHGEAR AND CONTROLGEAR –
Part 108: High-voltage alternating current disconnecting
circuit-breakers for rated voltages above 52 kV
FOREWORD

1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising

all national electrotechnical committees (IEC National Committees). The object of IEC is to promote

international co-operation on all questions concerning standardization in the electrical and electronic fields. To

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2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international

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3) IEC Publications have the form of recommendations for international use and are accepted by IEC National

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4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications

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5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any

equipment declared to be in conformity with an IEC Publication.

6) All users should ensure that they have the latest edition of this publication.

7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and

members of its technical committees and IEC National Committees for any personal injury, property damage or

other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and

expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC

Publications.

8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is

indispensable for the correct application of this publication.

9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of

patent rights. IEC shall not be held responsible for identifying any or all such patent rights.

International Standard IEC 62271-108 has been prepared by subcommittee 17A, Switching

devices of IEC technical committee 17: High-voltage switchgear and controlgear.

This second edition cancels and replaces the first edition published in 2005. This edition

contains the following significant technical changes with respect to the previous edition:

– The document has been restructured according to IEC 62271-1:2017.

– The document has been adapted to some of the changes introduced in IEC 62271-100:– .

– The document has been adapted to some of the changes introduced in IEC 62271-
102:2018.
– References have been reviewed and updated.
_____________
Under preparation. Stage at the time of publication: IEC CDV 62271-100:2020.
---------------------- Page: 6 ----------------------
IEC 62271-108:2020 © IEC 2020 – 5 –
– Some definitions have been reviewed and adapted to the latest IEV editions.

– Rated static terminal load and static terminal load test have been removed and a design

requirement for static mechanical loads has been included.
– Additional type tests for auxiliary and control circuits have been included.
– X-radiation test procedure for vacuum interrupters has been included.

– Type test for testing of interlocking device and type test for testing of temporary

mechanical locking devices have been included.

– Special requirements for making and breaking tests on class E2 disconnecting circuit-

breakers have been removed.
The text of this standard is based on the following documents:
FDIS Report on voting
17A/1269/FDIS 17A/1274/RVD

Full information on the voting for the approval of this standard can be found in the report on

voting indicated in the above table.

This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

This document is to be read in conjunction with IEC 62271-100:– and IEC 62271-102:2018, to

which it refers and which are applicable, unless otherwise specified. In order to simplify the

indication of corresponding requirements, the same numbering of clauses and subclauses is

used as in IEC 62271-1:2017. Amendments to these clauses and subclauses are given under

the same numbering, whilst additional subclauses are numbered from 101.

A list of all parts of the IEC 62271 series, under the general title High-voltage switchgear and

controlgear, can be found on the IEC website.

In Canada, disconnecting circuit-breakers are accepted only when a visible gap is provided.

The committee has decided that the contents of this publication will remain unchanged until

the stability date indicated on the IEC website under "http://webstore.iec.ch" in the data

related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
---------------------- Page: 7 ----------------------
– 6 – IEC 62271-108:2020 © IEC 2020
HIGH-VOLTAGE SWITCHGEAR AND CONTROLGEAR –
Part 108: High-voltage alternating current disconnecting
circuit-breakers for rated voltages above 52 kV
1 Scope

This part of IEC 62271 applies to high-voltage alternating current disconnecting circuit-

breakers for operation at frequencies of 50 Hz and 60 Hz on systems having voltages above

52 kV.
This document identifies which requirements of IEC 62271-1, IEC 62271-100:– and

IEC 62271-102 are applicable. It also gives the additional requirements specific to these

devices.

This document covers single switching devices which perform the functions of both a circuit-

breaker and a disconnector by means of contacts housed in a single enclosure, and in which

the circuit-breaker contacts in the open position satisfy, or contribute to, the isolating

requirements of the disconnector function. As there is interaction between the requirements of

the separate functions, it is important to consider the standardization of requirements. This

document details the requirements for a disconnecting circuit-breaker, identifying where these

differ from the separate requirements of a discrete circuit-breaker and a disconnector.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their

content constitutes requirements of this document. For dated references, only the edition

cited applies. For undated references, the latest edition of the referenced document (including

any amendments) applies.

IEC 60050-441:1984, International electrotechnical vocabulary (IEV) – Part 441: Switchgear,

controlgear and fuses
IEC 60050-441:1984/AMD1:2000 (available at: http://www.electropedia.org)

IEC 60050-614:2016, International electrotechnical vocabulary (IEV) – Part 614: Generation,

transmission and distribution of electricity – Operation (available at:
http://www.electropedia.org)

IEC 62271-1:2017, High-voltage switchgear and controlgear – Part 1: Common specifications

for alternating current switchgear and controlgear

IEC 62271-100:–, High-voltage switchgear and controlgear – Part 100: Alternating current

circuit-breakers

IEC 62271-102:2018, High-voltage switchgear and controlgear – Part 102: Alternating current

disconnectors and earthing switches
3 Terms and definitions

For the purposes of this document, the terms and definitions given in IEC 60050-441,

IEC 60050-614 and the following apply.
---------------------- Page: 8 ----------------------
IEC 62271-108:2020 © IEC 2020 – 7 –

ISO and IEC maintain terminological databases for use in standardization at the following

addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp

NOTE 1 Certain definitions taken from IEC 60050-441, IEC 60050-614 and IEC 62271-1 are recalled here for

ease of reference.

NOTE 2 Additional definitions given here are classified in a manner that aligns with the classification used in

IEC 60050-441.
3.1 General terms and definitions
No particular definitions.
3.2 Assemblies of switchgear and controlgear
No particular definitions.
3.3 Parts of assemblies
No particular definitions.
3.4 Switching devices
3.4.101
circuit-breaker

mechanical switching device, capable of making, carrying and breaking currents under normal

circuit conditions and also making, carrying for a specified time and breaking currents under

specified abnormal circuit conditions such as those of short circuit
[SOURCE: IEC 60050-441:2000, 441-14-20]
3.4.102
disconnecting circuit-breaker

circuit-breaker satisfying the requirements of a disconnector, when the contacts are in open

position

Note 1 to entry: For design examples of disconnecting circuit-breakers, refer to Annex A.

3.5 Parts of switchgear and controlgear
3.5.101
power kinematic chain

mechanical connecting system between the operating mechanism and the moving contacts,

both included
3.6 Operational characteristics of switchgear and controlgear
3.6.101
closed position

position in which the predetermined continuity of the main

circuit of the device is secured
[SOURCE: IEC 60050-441:2000, 441-16-22]
---------------------- Page: 9 ----------------------
– 8 – IEC 62271-108:2020 © IEC 2020
3.6.102
open position

position in which the predetermined clearance between

open contacts in the main circuit of the device is secured
[SOURCE: IEC 60050-441:2000, 441-16-23]
3.6.103
interlocking device

device which makes the operation of a switching device dependent upon the position or

operation of one or more other pieces of equipment
[SOURCE: IEC 60050-441:2000, 441-16-49]
3.7 Characteristic quantities
3.7.101
insulation level

set of withstand voltages specified which characterize the dielectric strength of the insulation

[SOURCE: IEC 60050-614:2016, 614-03-23]
3.7.102
external insulation

distances in atmospheric air, and surfaces of solid insulation of disconnectors and earthing

switches in contact with the air, which are subject to dielectric stresses and to the effect of

atmospheric and other external conditions

Note 1 to entry: External insulation is either weather-protected or non-weather-protected, designed to operate

outside or inside closed shelters, respectively.

Note 2 to entry: Other external conditions include pollution, humidity, vermin, etc.

[SOURCE: IEC 60050-614:2016, 614-03-02, modified – Note 1 to entry has been added.]

3.7.103
internal insulation

internal solid, liquid or gaseous parts of the insulation of equipment which are protected from

the effects of atmospheric and other external conditions

[SOURCE: IEC 60050-614:2016, 614-03-03, modified – In the definition, "distances of the"

has been deleted and "parts of the" has been added.]
3.7.104
isolating distance

clearance between open poles meeting the

safety requirements specified for disconnectors

[SOURCE: IEC 60050-441:2000, 441-17-35, modified – In the definition, "contacts" has been

replaced by "poles".]
3.8 Index of definitions
Circuit-breaker 3.4.101
Closed position (of a mechanical switching device) 3.6.101
D – E
Disconnecting circuit-breaker 3.4.102
---------------------- Page: 10 ----------------------
IEC 62271-108:2020 © IEC 2020 – 9 –
External insulation 3.7.102
Insulation level 3.7.101
Interlocking device 3.6.103
Internal insulation 3.7.103
Isolating distance (of a pole of a mechanical switching device) 3.7.104
O – P
Open position (of a mechanical switching device) 3.6.102
Power kinematic chain 3.5.101
4 Normal and special service conditions
Clause 4 of IEC 62271-100:– is applicable.
5 Ratings
5.1 General

Clause 5 of IEC 62271-100:– is applicable with the following additions and modification.

The rated characteristics of the disconnecting circuit-breaker are referred to the rated

operating sequence.

Disconnecting circuit-breakers need not be assigned ratings with respect to bus-transfer

current switching. The bus-transfer current switching capability is covered by the making and

breaking tests in IEC 62271-100:–.
Rated contact zone is not applicable for disconnecting circuit-breakers.
5.3 Rated insulation level (U , U , U )
d p s
Subclause 5.3 of IEC 62271-100:– is applicable with the following addition:

The standard values of rated withstand voltages across the isolating distance of the

disconnecting circuit-breaker are given in columns 3 and 5 of Table 1 and Table 2, columns 3,

6 and 8 of Table 3 and columns 3, 5 and 7 of Table 4 in IEC 62271-1:2017.
6 Design and construction
6.1 General
Clause 6 of IEC 62271-100:– and IEC 62271-102:2018 are applicable, unless stated
otherwise.

The design of the disconnecting circuit-breaker shall take into account the mechanical,

electrical and other requirements of a circuit-breaker and a disconnector as a single device.

6.11 Nameplates
Subclause 6.11 of IEC 62271-100:– is applicable with the following addition:
---------------------- Page: 11 ----------------------
– 10 – IEC 62271-108:2020 © IE
...

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