IEC TS 62271-314:2024

IEC TS 62271-314 ®
Edition 1.0 2024-06
TECHNICAL
SPECIFICATION
colour
inside
High-voltage switchgear and controlgear –
Part 314: Direct current disconnectors and earthing switches

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 Secretariat Tel.: +41 22 919 02 11
3, rue de Varembé info@iec.ch
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
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 Products & Services Portal - products.iec.ch
The advanced search enables to find IEC publications by a Discover our powerful search engine and read freely all the
variety of criteria (reference number, text, technical publications previews, graphical symbols and the glossary.
committee, …). It also gives information on projects, replaced With a subscription you will always have access to up to date
and withdrawn publications. content tailored to your needs.

IEC Just Published - webstore.iec.ch/justpublished
Electropedia - www.electropedia.org
Stay up to date on all new IEC publications. Just Published
The world's leading online dictionary on electrotechnology,
details all new publications released. Available online and once
containing more than 22 500 terminological entries in English
a month by email.
and French, with equivalent terms in 25 additional languages.

Also known as the International Electrotechnical Vocabulary
IEC Customer Service Centre - webstore.iec.ch/csc
(IEV) online.
If you wish to give us your feedback on this publication or need

further assistance, please contact the Customer Service
Centre: sales@iec.ch.
IEC TS 62271-314 ®
Edition 1.0 2024-06
TECHNICAL
SPECIFICATION
colour
inside
High-voltage switchgear and controlgear –

Part 314: Direct current disconnectors and earthing switches

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.130.10  ISBN 978-2-8322-8938-9

– 2 – IEC TS 62271-314:2024 © IEC 2024
CONTENTS
FOREWORD . 8
1 Scope . 10
2 Normative references . 10
3 Terms and definitions . 11
3.1 General terms and definitions . 11
3.2 Assemblies of switchgear and controlgear . 11
3.3 Parts of assemblies . 12
3.4 Switching devices . 12
3.5 Parts of switchgear and controlgear . 13
3.6 Operational characteristics of switchgear and controlgear . 16
3.7 Characteristic quantities . 18
3.8 Index of definitions . 21
4 Normal and special service conditions . 23
5 Ratings . 23
5.1 General . 23
5.2 Rated direct voltage (U ) . 24
rd
5.3 Rated insulation level (U , U , U ) . 24
dd p s
5.4 Rated continuous current (I ) . 27
rd
5.5 Rated values of short-time withstand current . 27
5.5.1 Typical waveform of short-circuit current . 27
5.5.2 Rated short-time withstand current (I ) . 27
kd
5.5.3 Rated peak withstand current (I ) . 27
pd
5.5.4 Rated duration of short circuit (t ) . 27
kd
5.6 Rated supply voltage of auxiliary and control circuits (U ) . 27
a
5.7 Rated supply frequency of auxiliary circuits and control circuits . 27
5.8 Rated pressure of compressed gas supply for controlled pressure systems . 27
5.101Rated contact zone . 28
5.102Rated static mechanical terminal load . 28
5.103Classification of disconnectors for mechanical endurance. 29
5.104Classification of earthing switches for mechanical endurance . 30
5.105Rated ice-coating. 30
5.106Rated cable discharge current making capability . 30
6 Design and construction . 31
6.1 Requirements for liquids in disconnectors and earthing switches . 31
6.2 Requirements for gases in disconnectors and earthing switches . 31
6.3 Earthing of disconnectors and earthing switches . 31
6.4 Auxiliary and control equipment and circuits . 31
6.5 Dependent power operation . 31
6.6 Stored energy operation . 31
6.7 Independent unlatched operation (independent manual or power operation) . 32
6.8 Manually operated actuators . 32
6.9 Operation of releases . 32
6.10 Pressure/level indication . 32
6.11 Nameplates. 32
6.12 Locking devices . 33

6.13 Position Indication . 34
6.14 Degree of protection provided by enclosures . 34
6.15 Creepage distances for outdoor insulators . 34
6.16 Gas and vacuum tightness . 34
6.17 Tightness for liquid systems . 34
6.18 Fire hazard (flammability) . 34
6.19 Electromagnetic compatibility (EMC) . 34
6.20 X-ray emission . 34
6.21 Corrosion . 34
6.22 Filling levels for insulation, switching and/or operation . 34
6.101Particular requirements for earthing switches . 35
6.102Requirements in respect of the isolating distance of disconnectors . 35
6.103Mechanical strength . 35
6.104 Operation of disconnectors and earthing switches – Position of the movable
contact system and its indicating and signalling devices . 35
6.104.1Securing of position . 35
6.104.2Additional requirements for power-operated mechanisms . 35
6.104.3Indication and signalling of position . 36
6.104.3.1General requirements . 36
6.104.3.2Indication of position . 37
6.104.3.3Signalling of position by auxiliary contacts . 37
6.105Maximum force required for manual (dependent or independent) operation . 37
6.105.1General . 37
6.105.2Operation requiring more than one revolution . 37
6.105.3Operation requiring up to one revolution . 37
6.106Dimensional tolerances. 37
6.107Earthing switches with short-circuit making current capability . 38
7 Type tests . 38
7.1 General . 38
7.1.1 Basics . 38
7.1.2 Information for identification of test objects . 39
7.1.3 Information to be included in type test reports . 39
7.2 Dielectric tests . 40
7.2.1 General . 40
7.2.2 Ambient air conditions during tests . 40
7.2.3 Wet test procedure . 40
7.2.4 Arrangement of the equipment . 40
7.2.5 Criteria to pass the test . 40
7.2.6 Application of the test voltage and test conditions . 40
7.2.7 Test of disconnectors and earthing switches . 41
7.2.8 Artificial pollution tests for outdoor insulators . 41
7.2.9 Partial discharge tests . 41
7.2.10 Dielectric tests on auxiliary and control circuits . 42
7.2.11 Voltage test as condition check . 42
7.3 Resistance measurement . 42
7.4 Continuous current tests . 42
7.5 Short-time withstand current and peak withstand current tests . 42
7.5.1 General . 42

– 4 – IEC TS 62271-314:2024 © IEC 2024
7.5.2 Arrangement of the disconnectors and earthing switches and of the test
circuit . 42
7.5.3 Test current and duration . 48
7.5.4 Conditions of disconnectors and earthing switches after test . 48
7.6 Verification of the protection . 48
7.7 Ti
...