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EUROPEAN STANDARD
EN 62271-108
NORME EUROPÉENNE
March 2006
EUROPÄISCHE NORM
ICS 29.130.10
English version
High-voltage switchgear and controlgear
Part 108: High-voltage alternating current disconnecting
circuit-breakers for rated voltages of 72,5 kV and above
(IEC 62271-108:2005)
Appareillage à haute tension Hochspannungs-Schaltgeräte
Partie 108: Disjoncteurs-sectionneurs und -Schaltanlagen
à courant alternatif à haute tension Teil 108: Hochspannungs-Wechselstrom-
de tensions assignées supérieures Leistungsschalter mit Trennfunktion
ou égales à 72,5 kV für Bemessungsspannungen
(CEI 62271-108:2005) größer oder gleich 72,5 kV
(IEC 62271-108:2005)
This European Standard was approved by CENELEC on 2005-12-01. CENELEC members are bound to comply
with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard
the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on
application to the Central Secretariat or to any CENELEC member.

This European Standard exists in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CENELEC member into its own language and notified
to the Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Cyprus, the Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: rue de Stassart 35, B - 1050 Brussels

© 2006 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 62271-108:2006 E
Foreword
The text of document 17A/742/FDIS, future edition 1 of IEC 62271-108, prepared by SC 17A, High-
voltage switchgear and controlgear, of IEC TC 17, Switchgear and controlgear, was submitted to the
IEC-CENELEC parallel vote and was approved by CENELEC as EN 62271-108 on 2005-12-01.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2006-10-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2008-12-01
This European Standard should be read in conjunction with EN 62271-100:2001, EN 62271-102:2002
and EN 60694:1996, to which it refers and which is applicable, unless otherwise specified. In order to
simplify the indication of corresponding requirements, the same numbering of clauses and subclauses is
used as in EN 60694. Additional subclauses are numbered from 101.
This European Standard makes reference to International Standards. Where the International Standard
referred to has been endorsed as a European Standard or a home-grown European Standard exists, this
European Standard shall be applied instead. Pertinent information can be found on the CENELEC web
site.
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 62271-108:2005 was approved by CENELEC as a European
Standard without any modification.
__________
- 3 - EN 62271-108:2006
Annex ZA
(informative)
A-deviations
A-deviation: National deviation due to regulations, the alteration of which is for the time being outside the
competence of the CENELEC member.
A-deviations in an EFTA-country are valid instead of the relevant provisions of the European Standard in
that country until they have been removed.
Clause Deviation
1.1 Italy
1)
(I.S.P.E.S.L. Rules, 95 revision: VSR.8.B.1; VSR.8.B.2; M.15.D.2)
Italian laws apply to gas pressurized enclosures made of both insulating and metallic
materials with a capacity of 25 litres or above, a design pressure higher than
0,05 kg/cm² and a temperature range: -25 °C/+100 °C (only for insulating materials).

Moreover the manufacturer of any electrical equipment which comprehends gas
pressurized enclosures must submit the design of the pressurized enclosures itself to
a proper legal Authority indicating the stresses and the loads which have any influence
on the design itself. For each of the stresses the manufacturer must indicate the
design values and the relevant computations.

– For metal-enclosed switchgear and controlgear containing gas-filled
compartments, the design pressure is limited to a maximum of 0,5 bar (gauge) and
the volume is limited to a maximum of 2 m .

– Gas filled compartments having a design pressure exceeding 0,5 bar (gauge) or a
volume exceeding 2 m shall be designed according to Italian pressure vessel code
for electrical switchgear (DM 1 December 1980 and DM 10 September 1981
published on Gazzetta Ufficiale n° 285 dated 16.10.1981).

5 Italy
1)
(I.S.P.E.S.L. Rules, 95 revision: VSR.8.B.1 and M.15.D.3. Tab I for porcelain)
Only the use of porcelain type A or S. (Aluminous or Siliceous) is permitted.

6 Italy
1)
(I.S.P.E.S.L. Rules, 95 revision: VSR.8.B.1 Clause 2)
The type test shall be performed in the presence of the Authority Supervisor.

1)
(I.S.P.E.S.L. Rules, 95 revision: VSR.8.B.2 Clause 2; M.15.D.4)
An additional pressure test shall be performed on a complete pressurized enclosure.
This has to withstand 1,5 times the design pressure without failure for five minutes.

Temperature cycles test and electrical test shall be made; after these tests shall be
carried out consecutively the pressure test at pressure p ≥ 4,25 times the design
pressure.
7 Italy
1)
(I.S.P.E.S.L. Rules, 95 revision: VSR.8.B.1 subclause 4.1.2)
For a homogeneous batch of 100 pieces max., one hollow insulator shall be subjected
to the failure test with a pressure 4,25 times the design pressure.

1)
I.S.P.E.S.L.: Istituto Superiore per la Prevenzione e la Sicurezza del Lavoro

NORME CEI
INTERNATIONALE
IEC
62271-108
INTERNATIONAL
Première édition
STANDARD
First edition
2005-10
Appareillage à haute tension –
Partie 108:
Disjoncteurs-sectionneurs à courant alternatif
à haute tension de tensions assignées
supérieures ou égales à 72,5 kV

High-voltage switchgear and controlgear –
Part 108:
High-voltage alternating current disconnecting
circuit-breakers for rated voltages of 72,5 kV
and above
 IEC 2005 Droits de reproduction réservés  Copyright - all rights reserved
Aucune partie de cette publication ne peut être reproduite ni No part of this publication may be reproduced or utilized in any
utilisée sous quelque forme que ce soit et par aucun procédé, form or by any means, electronic or mechanical, including
électronique ou mécanique, y compris la photocopie et les photocopying and microfilm, without permission in writing from
microfilms, sans l'accord écrit de l'éditeur. the publisher.
International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland
Telephone: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: inmail@iec.ch Web: www.iec.ch
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МеждународнаяЭлектротехническаяКомиссия
Pour prix, voir catalogue en vigueur
For price, see current catalogue

62271-108  IEC:2005 – 3 –
CONTENTS
FOREWORD.7

1 General .11
1.1 Scope and object.11
1.2 Normative references .11
2 Normal and special service conditions .11
3 Terms and definitions .13
3.1 General terms .13
3.2 Assemblies of switchgear and controlgear .13
3.3 Parts of assemblies.13
3.4 Switching devices.13
3.5 Parts of switchgear and controlgear .13
3.6 Operation .15
3.7 Characteristic quantities .15
4 Ratings.17
4.2 Rated insulation level.19
4.112 Rated static terminal load.19
5 Design and construction .25
5.10 Nameplates .25
5.11 Interlocking devices.25
5.12 Position indication.25
5.102 Requirements in respect of the isolating distance of disconnecting circuit-
breakers.25
5.104.1 Securing of position.25
5.104.2 Additional requirements for power operated mechanisms .25
6 Type tests .27
6.1 General .27
6.2 Dielectric tests.27
6.3 Radio interference (r.i.v.) tests .27
6.4 Measurement of the resistance of the main circuit .27
6.5 Temperature-rise tests.27
6.6 Short-time withstand current and peak withstand current tests .27
6.7 Verification of the degree of protection .27
6.8 Tightness tests.27
6.9 Electromagnetic compatibility tests.27
6.101 Mechanical and environmental tests.29
6.102 Miscellaneous provisions for making and breaking tests.29
6.103 Test circuits for short-circuit making and breaking tests.29
6.104 Short-circuit test quantities.29
6.105 Short-circuit test procedure.29
6.106 Basic short-circuit test-duties.29
6.107 Critical current tests .29
6.108 Single-phase and double-earth fault tests.31
6.109 Short-line fault tests.31
6.110 Out-of-phase making and breaking tests .31

62271-108  IEC:2005 – 5 –
6.111 Capacitive current switching tests .31
6.112 Special requirements for making and breaking tests on class E2
disconnecting circuit-breakers .31
6.113 Tests to verify the proper function of the position indicating device .31
A.6.105Tests to verify the proper function of the position indicating device.31
6.114 Combined function test.33
7 Routine tests .43
8 Guide to the selection of disconnecting circuit-breakers for service .43
9 Information to be given with enquires, tenders and orders .43
10 Rules for transport, storage, installation, operation and maintenance .43
11 Safety.43

Annex A (informative) Explanatory notes and examples of disconnecting circuit-breakers.45

Bibliography.47

Figure 1 – Static terminal load forces.21
Figure 2 – Directions for static terminal load tests.23
Figure 3 – Test sequence for mechanical operations and short-circuit combined
function tests when performed as separate tests.35
Figure 4 – Test sequence for mechanical operations and short-circuit combined
function tests when performed in one sequence.37
Figure A.1 – A making (breaking) unit (or several identical units connected in series)
which satisfies the dielectric requirements of a disconnector.45
Figure A.2 – Device with a single gap which is divided into a making (breaking) section
and an isolating section .45
Figure A.3 – Circuit-breaker which, together with a series connected disconnector,
commonly satisfies the dielectric requirements of a disconnector in open position .45

Table 1 – Recommended static terminal loads .19

62271-108  IEC:2005 – 7 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
___________
HIGH-VOLTAGE SWITCHGEAR AND CONTROLGEAR –

Part 108: High-voltage alternating current disconnecting circuit-breakers
for rated voltages of 72,5 kV and above

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
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
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, High-voltage
switchgear and controlgear of IEC technical committee 17: Switchgear and controlgear.
The text of this standard is based on the following documents:
FDIS Report on voting
17A/742/FDIS 17A/749/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.

62271-108  IEC:2005 – 9 –
In Canada disconnecting circuit-breakers are accepted only when a visible gap is provided.
This standard should be read in conjunction with IEC 62271-100 (2001), IEC 62271-102
(2001) and IEC 60694, second edition, published in 1996, to which it refers and which is
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 60694.
Amendments to these clauses and subclauses are given under the same numbering, whilst
additional subclauses are numbered from 101.
The following standards belong to the same IEC 62271 series, under the general title High-
voltage switchgear and controlgear:
Part 100: High-voltage alternating-current circuit-breakers
Part 101: Synthetic testing (to be published)
Part 102: Alternating current disconnectors and earthing switches
Part 104: Alternating current switches for rated voltages of 52 kV and above (in preparation)
Part 105: Alternating current switch-fuse combinations
Part 107: Alternating current fused circuit-switchers for rated voltages above 1 kV up to and
including 52 kV (to be published)
Part 108: High voltage alternating current disconnecting circuit-breakers for rated voltages
of 72,5 kV and above
Part 109: Alternating-current series capacitor by-pass switches (to be published)
Part 110: Inductive load switching
The list of other parts of the IEC 62271 series can be found on the IEC website
http://www.iec.ch.  Further information is available at http://tc17.iec.ch.
The committee has decided that the contents of this publication will remain unchanged until
the maintenance result date indicated on the IEC web site 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.
62271-108  IEC:2005 – 11 –
HIGH-VOLTAGE SWITCHGEAR AND CONTROLGEAR –

Part 108: High-voltage alternating current disconnecting circuit-breakers
for rated voltages of 72,5 kV and above

1 General
1.1 Scope and object
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 of 72,5 kV and
above.
This standard identifies which requirements of IEC 60694, IEC 62271-100 and IEC 62271-102
standards are applicable. It also gives the additional requirements specific to these devices.
This standard covers a circuit-breaker which, when in the open position, satisfies the
requirements of both a circuit-breaker and a disconnector.
As there is interaction between the requirements of the separate functions it is necessary to
consider the standardisation of requirements. This standard details the requirements for a
disconnecting circuit-breaker, identifying where these differ from the separate requirements of
a discrete circuit-breaker and a disconnector.
NOTE For design examples of disconnecting circuit-breakers, refer to Annex A.
1.2 Normative references
The following referenced documents are indispensable for the application 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 60694:1996, Common specifications for high-voltage switchgear and controlgear
standards
IEC 62271-100:2001, High-voltage switchgear and controlgear – Part 100: High-voltage
alternating-current circuit-breakers
IEC 62271-102:2001, High-voltage switchgear and controlgear – Part 102: Alternating-current
disconnectors and earthing switches
IEC 62271-310:2004, High-voltage switchgear and controlgear – Part 310: Electrical
endurance testing for circuit-breakers of rated voltage 72,5 kV and above
2 Normal and special service conditions
Clause 2 of IEC 60694 is applicable.

62271-108  IEC:2005 – 13 –
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
NOTE 1 Certain definitions taken from IEC 60050(441), IEC 60050(604) and IEC 60694 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
3.1.1
switchgear and controlgear
general term covering switching devices and their combination with associated control,
measuring, protective and regulating equipment, also assemblies of such devices and equip-
ment with associated interconnections, accessories, enclosures and supporting structures
[IEV 441-11-01]
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
[IEV 441-14-20]
3.4.102
disconnector
mechanical switching device which provides, in the open position, an isolating distance in
accordance with specified requirements
[IEV 441-14-05]
3.4.103
disconnecting circuit-breaker
circuit-breaker satisfying the requirements of a disconnector, when the contacts are in open
position
3.5 Parts of switchgear and controlgear
No particular definitions.
62271-108  IEC:2005 – 15 –
3.6 Operation
3.6.101
closed position (of a mechanical switching device)
position in which the predetermined continuity of the main circuit of the device is secured
[IEV 441-16-22]
3.6.102
open position (of a mechanical switching device)
position in which the predetermined clearance between open contacts in the main circuit of
the device is secured
[IEV 441-16-23]
3.6.103
interlocking device
device which makes the operation of a switching device dependent upon the position of
operation of one or more other pieces of equipment
[IEV 441-16-49]
3.7 Characteristic quantities
3.7.101
insulation level
for a disconnecting circuit-breaker, a characteristic defined by one or two values indicating the
insulation withstand voltages
[IEV 604-03-47, modified]
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 such as pollution, humidity, vermin, etc.
[IEV 604-03-02, modified]
NOTE External insulation is either weather-protected or non-weather-protected, designed to operate outside or
inside closed shelters, respectively
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
[IEV 604-03-03]
3.7.104
isolating distance (of a pole of a mechanical switching device)
clearance between open poles meeting the safety requirements specified for disconnectors
[IEV 441-17-35, modified]
62271-108  IEC:2005 – 17 –
4 Ratings
Clause 4 of IEC 62271-100 is applicable, unless stated otherwise.
The characteristics of a disconnecting circuit-breaker, including its operating devices, and
auxiliary equipment, that shall be used to determine the rating are the following:
Rated characteristics to be given for all disconnecting circuit-breakers
a) rated voltage;
b) rated insulation level;
c) rated frequency;
d) rated normal current;
e) rated short-time withstand current;
f) rated peak withstand cur
...