IEC 62271-105:2021

High-voltage switchgear and controlgear - Part 105: Alternating current switch-fuse combinations for rated voltages above 1 kV up to and including 52 kV

IEC 62271-105:2021 is available as IEC 62271-105:2021 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.
IEC 62271-105:2021 applies to three-pole units for public and industrial distribution systems which are functional assemblies of switches composed of switches or switch-disconnectors and current-limiting fuses designed so as to be capable of
- breaking, at the rated voltage, any current up to and including the rated short-circuit breaking current;
- making, at the rated voltage, circuits to which the rated short-circuit breaking current applies.
This third edition cancels and replaces the second edition published in 2012. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
- the document has been updated to be in alignment with the second edition of IEC 62271-1:2017;
- rated TRV has been removed (TRV is only a test parameter), as in the latest revision of IEC 62271-100;
- differentiation has been introduced between requirements expressed for fulfilling the function expected from a switch-fuse combination, from requirements only relevant when the function is performed by a stand-alone device. The goal is to avoid duplication or conflicts of requirements with a standard dealing with assemblies, when the function is implemented within such an assembly.

Appareillage à haute tension - Partie 105: Combinés interrupteurs-fusibles pour courant alternatif de tensions assignées supérieures à 1 kV et jusqu'à 52 kV inclus

IEC 62271-105:2021 est disponible sous forme de IEC 62271-105:2021 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.
L’IEC 62271-105:2021 est applicable aux appareils tripolaires utilisés dans les réseaux de distribution publics ou les installations industrielles. Ces derniers forment des ensembles fonctionnels composés d'interrupteurs ou d'interrupteurs-sectionneurs et de fusibles limiteurs de courant, conçus pour être capables de
- couper, à la tension assignée, tous les courants jusqu'au pouvoir de coupure assigné en court-circuit inclus;
- établir, à la tension assignée, des circuits pour lesquels le pouvoir de coupure assigné en court-circuit s’applique.
Cette troisième édition annule et remplace la deuxième édition parue en 2012. Cette édition constitue une révision technique.
Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
- le document a été mis à jour conformément à la 2e édition de l’IEC 62271-1:2017;
- la TTR assignée est supprimée (la TTR n’est qu’un paramètre d’essai) comme dans la dernière édition de l’IEC 62271‑100;
- une distinction est désormais faite entre les exigences spécifiées pour l’exécution de la fonction attendue d’un combiné interrupteur-fusibles, et les exigences qui ne sont pertinentes que lorsque la fonction est exécutée par un appareil autonome. Cette distinction a pour but d’éviter des répétitions ou des contradictions d’exigences avec une norme traitant d’ensembles, lorsque la fonction est mise en œuvre au sein d’un tel ensemble.

General Information

• Status: Published
• Publication Date: 14-Jun-2021
• ICS: 29.130.10 - High voltage switchgear and controlgear
• Technical Committee: SC 17A - Switching devices
• Drafting Committee: MT 51 - TC 17/SC 17A/MT 51
• Current Stage: PPUB - Publication issued
• Start Date: 18-Jun-2021
• Completion Date: 15-Jun-2021

Relations

• Revises: IEC 62271-105:2012 - High-voltage switchgear and controlgear - Part 105: Alternating current switch-fuse combinations for rated voltages above 1 kV up to and including 52 kV
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 62271-105 ®
Edition 3.0 2021-06
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
High-voltage switchgear and controlgear –
Part 105: Alternating current switch-fuse combinations for rated voltages above
1 kV up to and including 52 kV

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
your local IEC member National Committee for further information.

IEC Central Office Tel.: [phone]
3, rue de Varembé [e-mail]
CH-1211 Geneva 20 www.iec.ch
Switzerland
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.

About IEC publications
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(IEV) online.
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If you wish to give us your feedback on this publication or
need further assistance, please contact the Customer Service
Centre: [e-mail].
IEC 62271-105 ®
Edition 3.0 2021-06
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
High-voltage switchgear and controlgear –

Part 105: Alternating current switch-fuse combinations for rated voltages above

1 kV up to and including 52 kV

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.130.10 ISBN 978-2-8322-9910-4

– 2 – IEC 62271-105:2021 RLV  IEC 2021
CONTENTS
FOREWORD . 6
1 General .
1 Scope . 8
2 Normative references . 9
3 Terms and definitions . 9
3.1 General terms and definitions . 10
3.2 Assemblies of switchgear and controlgear . 10
3.3 Parts of assemblies . 10
3.4 Switching devices . 10
3.5 Parts of switchgear and controlgear . 11
3.6 Operational characteristics of switchgear and controlgear . 11
3.7 Characteristic quantities . 12
3.101 Fuses. 16
4 Normal and special service conditions . 17
5 Ratings . 17
5.1 General . 17
5.2 Rated voltage (U ) . 17
r
5.3 Rated insulation level (U , U , U ) . 17
d p s
5.4 Rated frequency (f ) . 17
r
5.5 Rated normal current and temperature rise Rated continuous current (I ) . 18
r
5.6 Rated short-time withstand current (I ) . 18
k
5.7 Rated peak withstand current (I ) . 18
p
5.8 Rated duration of short-circuit (t ) . 18
k
5.9 Rated supply voltage of closing and opening devices and of auxiliary and
control circuits (U ) . 18
a
5.10 Rated supply frequency of closing and opening devices and of auxiliary and
control circuits . 18
4.11 Rated filling levels for insulation and/or operation .
5.11 Rated pressure of compressed gas supply for controlled pressure systems . 19
5.101 Rated short-circuit breaking current . 19
4.102 Rated transient recovery voltage .
5.102 Rated short-circuit making current . 19
5.103 Rated transfer current (striker operation) (I ) . 20
rtransfer
5.104 Rated take-over current for release-operated combinations (I I ) . 20
to rto
6 Design and construction . 20
6.1 Requirements for liquids in switch-fuse combinations . 20
6.2 Requirements for gases in switch-fuse combinations . 20
6.3 Earthing of switch-fuse combinations . 20
6.4 Auxiliary and control equipment and circuits . 20
6.5 Dependent power operation . 20
6.6 Stored energy operation . 20
6.7 Independent manual or power operation (independent unlatched operation)
Independent unlatched operation (independent manual or power operation) . 20
6.8 Manually operated actuators . 21

6.9 Operation of releases . 21
5.9 Low- and high-pressure interlocking and monitoring devices .
6.10 Pressure/level indication . 21
6.11 Nameplates. 21
6.12 Interlocking Locking devices . 23
6.13 Position indication . 23
6.14 Degrees of protection provided by enclosures . 23
6.15 Creepage distances for outdoor insulators . 23
6.16 Gas and vacuum tightness . 23
6.17 Liquid tightness Tightness for liquid systems . 23
6.18 Fire hazard (flammability) . 23
6.19 Electromagnetic compatibility (EMC) . 23
6.20 X-ray emission . 23
6.21 Corrosion . 24
6.22 Filling levels for insulation, switching and/or operation . 24
6.101 Linkages between the fuse striker(s) and the switch release . 24
6.102 Low over-current conditions (long fuse-pre-arcing time conditions) . 24
7 Type tests . 24
7.1 General . 24
7.1.1 Basics . 24
7.1.2 Information for identification of specimens test objects . 25
7.1.3 Information to be included in type-test reports . 25
7.2 Dielectric tests . 26
7.3 Radio interference voltage (RIV) test . 26
7.4 Measurement of the resistance of circuits Resistance measurement . 26
7.5 Temperature-rise Continuous current tests . 26
7.6 Short-time withstand current and peak withstand current tests . 27
7.7 Verification of the protection . 27
7.8 Tightness tests . 27
7.9 Electromagnetic compatibility tests (EMC) . 27
7.10 Additional tests on auxiliary and control circuits . 27
7.11 X-radiation test procedure for vacuum interrupters . 27
7.101 Making and breaking tests . 27
7.101.1 General . 27
7.101.2 Conditions for performing the tests . 28
7.101.3 Test-duty procedures . 35
7.101.4 Behaviour of the combination during tests . 40
7.101.5 Condition of the apparatus after testing . 41
7.102 Mechanical operation tests . 42
7.103 Mechanical shock tests on fuses . 43
7.104 Thermal test with long pre-arcing time of fuse . 43
7.105 Extension of validity of type tests . 43
7.105.1 Dielectric . 43
7.105.2 Continuous current tests . 44
7.105.3 Making and breaking . 44
8 Routine tests . 44
8.101 Mechanical operating tests . 44
9 Guide to the selection of switch-fuse combinations (informative) . 45
9.101 Guide to the selection of switch-fuse combination for transformer protection . 45

– 4 – IEC 62271-105:2021 RLV  IEC 2021
9.101.1 General . 45
9.101.2 Rated short-circuit breaking current . 46
9.101.3 Primary fault condition caused by a solid short-circuit on the
transformer secondary terminals . 46
9.102 Coordination of switch and fuses for extension o
...

IEC 62271-105 ®
Edition 3.0 2021-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
High-voltage switchgear and controlgear –
Part 105: Alternating current switch-fuse combinations for rated voltages above
1 kV up to and including 52 kV

Appareillage à haute tension –
Partie 105: Combinés interrupteurs-fusibles pour courant alternatif de tensions
assignées supérieures à 1 kV et jusqu'à 52 kV inclus

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
your local IEC member National Committee for further information.

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les coordonnées ci-après ou contactez le Comité national de l'IEC de votre pays de résidence.

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About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.

About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigendum or an amendment might have been published.

IEC publications search - webstore.iec.ch/advsearchform IEC online collection - oc.iec.ch
The advanced search enables to find IEC publications by a Discover our powerful search engine and read freely all the
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Stay up to date on all new IEC publications. Just Published
containing more than 22 000 terminological entries in English
details all new publications released. Available online and
and French, with equivalent terms in 18 additional languages.
once a month by email.
Also known as the International Electrotechnical Vocabulary

(IEV) online.
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If you wish to give us your feedback on this publication or
need further assistance, please contact the Customer Service
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IEC 62271-105 ®
Edition 3.0 2021-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
High-voltage switchgear and controlgear –

Part 105: Alternating current switch-fuse combinations for rated voltages above

1 kV up to and including 52 kV

Appareillage à haute tension –

Partie 105: Combinés interrupteurs-fusibles pour courant alternatif de tensions

assignées supérieures à 1 kV et jusqu'à 52 kV inclus

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.130.10 ISBN 978-2-8322-9864-0

– 2 – IEC 62271-105:2021  IEC 2021
CONTENTS
FOREWORD . 5
1 Scope . 7
2 Normative references . 8
3 Terms and definitions . 8
3.1 General terms and definitions . 8
3.2 Assemblies of switchgear and controlgear . 8
3.3 Parts of assemblies . 8
3.4 Switching devices . 8
3.5 Parts of switchgear and controlgear . 9
3.6 Operational characteristics of switchgear and controlgear . 10
3.7 Characteristic quantities . 10
3.101 Fuses. 13
4 Normal and special service conditions . 14
5 Ratings . 14
5.1 General . 14
5.2 Rated voltage (U ) . 15
r
5.3 Rated insulation level (U , U , U ) . 15
d p s
5.4 Rated frequency (f ) . 15
r
5.5 Rated continuous current (I ) . 15
r
5.6 Rated short-time withstand current (I ) . 15
k
5.7 Rated peak withstand current (I ) . 15
p
5.8 Rated duration of short-circuit (t ) . 15
k
5.9 Rated supply voltage of auxiliary and control circuits (U ) . 15
a
5.10 Rated supply frequency of auxiliary and control circuits . 15
5.11 Rated pressure of compressed gas supply for controlled pressure systems . 15
5.101 Rated short-circuit breaking current . 16
5.102 Rated short-circuit making current . 16
5.103 Rated transfer current (striker operation) (I ) . 16
rtransfer
5.104 Rated take-over current for release-operated combinations (I ) . 16
rto
6 Design and construction . 16
6.1 Requirements for liquids in switch-fuse combinations . 16
6.2 Requirements for gases in switch-fuse combinations . 16
6.3 Earthing of switch-fuse combinations . 16
6.4 Auxiliary and control equipment and circuits . 17
6.5 Dependent power operation . 17
6.6 Stored energy operation . 17
6.7 Independent unlatched operation (independent manual or power operation) . 17
6.8 Manually operated actuators . 17
6.9 Operation of releases . 17
6.10 Pressure/level indication . 17
6.11 Nameplates. 17
6.12 Locking devices . 19
6.13 Position indication . 19
6.14 Degrees of protection provided by enclosures . 19

6.15 Creepage distances for outdoor insulators . 19
6.16 Gas and vacuum tightness . 19
6.17 Tightness for liquid systems . 19
6.18 Fire hazard (flammability) . 19
6.19 Electromagnetic compatibility (EMC) . 19
6.20 X-ray emission . 19
6.21 Corrosion . 19
6.22 Filling levels for insulation, switching and/or operation . 19
6.101 Linkages between the fuse striker(s) and the switch release . 19
6.102 Low over-current conditions (long fuse-pre-arcing time conditions) . 19
7 Type tests . 20
7.1 General . 20
7.1.1 Basics . 20
7.1.2 Information for identification of test objects . 20
7.1.3 Information to be included in type-test reports . 20
7.2 Dielectric tests . 21
7.3 Radio interference voltage (RIV) test . 21
7.4 Resistance measurement . 21
7.5 Continuous current tests . 21
7.6 Short-time withstand current and peak withstand current tests . 21
7.7 Verification of the protection . 21
7.8 Tightness tests . 21
7.9 Electromagnetic compatibility tests (EMC) . 21
7.10 Additional tests on auxiliary and control circuits . 21
7.11 X-radiation test for vacuum interrupters . 21
7.101 Making and breaking tests . 22
7.101.1 General . 22
7.101.2 Conditions for performing the tests . 22
7.101.3 Test-duty procedures .
...