IEC TS 62271-318:2024
(Main)High-voltage switchgear and controlgear - Part 318: DC gas-insulated metal-enclosed switchgear for rated voltages including and above 100 kV
High-voltage switchgear and controlgear - Part 318: DC gas-insulated metal-enclosed switchgear for rated voltages including and above 100 kV
IEC TS 62271-318:2024 specifies requirements for gas-insulated metal-enclosed switchgear in which the insulation is obtained, at least partly, by an insulating gas or gas mixture other than air at atmospheric pressure, for direct current of rated voltages including and above 100 kV, for indoor and outdoor installation. This document includes rules for service conditions, ratings, design, and construction requirements. Test requirements and criteria for proof for passing type and routine tests are defined in this document for development and manufacturing of DC switchgear. For the purpose of this document, the terms "DC GIS" and "DC switchgear" are used for "DC gas-insulated metal-enclosed switchgear". This specification is applicable for both Line Commutated Converter (LCC) and Voltage Sourced Converter (VSC) for HVDC systems. The DC gas-insulated metal-enclosed switchgear covered by this document consists of individual components intended to be directly connected together and able to operate only in this manner. This document completes and amends, if applicable, the various relevant documents applying to the individual components constituting DC gas-insulated metal-enclosed switchgear.
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IEC TS 62271-318 ®
Edition 1.0 2024-09
TECHNICAL
SPECIFICATION
High-voltage switchgear and controlgear –
Part 318: DC gas-insulated metal-enclosed switchgear for rated voltages
including and above 100 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 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
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IEC TS 62271-318 ®
Edition 1.0 2024-09
TECHNICAL
SPECIFICATION
High-voltage switchgear and controlgear –
Part 318: DC gas-insulated metal-enclosed switchgear for rated voltages
including and above 100 kV
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.130.10 ISBN 978-2-8322-9674-5
– 2 – IEC TS 62271-318:2024 © IEC 2024
CONTENTS
FOREWORD . 8
1 Scope . 10
2 Normative references . 10
3 Terms and definitions . 12
4 Normal and special service conditions . 16
4.1 Normal service conditions . 16
4.2 Special service conditions . 16
4.101 General . 17
5 Ratings . 17
5.1 General . 17
5.2 Rated direct voltage (U ) . 17
rd
5.3 Rated insulation level (U , U , U ) . 18
dd p s
5.4 Rated continuous current (I ) . 18
rd
5.5 Rated values of short-time withstand current . 18
5.5.1 Typical waveform of short-circuit current . 18
5.5.2 Rated short-time withstand direct current (I ) . 18
kd
5.5.3 Rated peak withstand current (I ) . 18
pd
5.5.4 Rated duration of short-circuit (t ) . 18
kd
5.6 Rated supply voltage of auxiliary and control circuits (U ) . 18
a
5.7 Rated supply frequency of auxiliary and control circuits . 18
5.8 Rated pressure of compressed gas supply for controlled pressure systems . 18
6 Design and construction . 19
6.1 Requirements for liquids in switchgear and controlgear . 19
6.2 Requirements for gases in switchgear and controlgear . 19
6.3 Earthing of switchgear and controlgear . 19
6.3.101 Earthing of the main circuit . 19
6.3.102 Earthing of the enclosure . 19
6.4 Auxiliary and control equipment and circuits . 19
6.5 Dependent power operation . 19
6.6 Stored energy operation . 19
6.7 Independent unlatched operation (independent manual or power operation) . 19
6.8 Manually operated actuators . 20
6.9 Operation of releases . 20
6.10 Pressure/level indication . 20
6.11 Nameplates. 20
6.12 Locking devices . 21
6.13 Position indication . 21
6.14 Degrees of protection provided by enclosures . 21
6.15 Creepage distances for outdoor insulators . 21
6.16 Gas and vacuum tightness . 21
6.16.1 General . 21
6.16.2 Controlled pressure systems for gas . 21
6.16.3 Closed pressure systems for gas . 21
6.16.4 Sealed pressure systems . 22
6.16.101 Leakage . 22
6.16.102 Gas handling . 22
6.17 Tightness for liquid systems . 22
6.18 Fire hazard (flammability) . 22
6.19 Electromagnetic compatibility (EMC) . 22
6.20 X-Ray emission . 22
6.21 Corrosion . 23
6.22 Filling levels for insulation, switching and/or operation . 23
6.101 General requirements for DC GIS . 23
6.102 Pressure coordination . 23
6.103 Internal arc fault . 24
6.103.1 General . 24
6.103.2 External effects of the arc . 25
6.103.3 Internal fault location . 26
6.104 Enclosures . 26
6.104.1 General . 26
6.104.2 Design of enclosures . 26
6.105 Partitions . 27
6.105.1 Design of partitions . 27
6.105.2 Partitioning . 27
6.106 Pressure relief . 29
6.106.1 General . 29
6.106.2 Non-reclosing pressure relief device . 29
6.106.3 Pressure relief valve . 29
6.106.4 Limitation of pressure rise in the case of an internal fault. 30
6.107 Noise . 30
6.108 Interfaces . 30
6.108.1 General . 30
6.108.2 Cable connections . 30
6.108.3 Direct transformer connections . 31
6.108.4 Bushings . 31
6.108.5 Interfaces for future extensions. 31
6.109 Interlocking . 32
7 Type tests . 32
7.1 General . 32
7.1.1 General remarks . 32
7.1.2 Information for identification of test objects . 33
7.1.3 Information to be included in type-test reports . 33
7.2 Dielectric tests . 33
7.2.1 General . 33
7.2.2 Ambient air conditions during tests . 34
7.2.3 Wet test procedure . 34
7.2.4 Arrangement of the equipment . 34
7.2.5 Criteria to pass the test . 34
7.2.6 Application of the test voltage and test conditions . 34
7.2.7 Tests of switchgear and controlgear . 35
7.2.8 Artificial pollution tests for outdoor insulators . 36
7.2.9 Partial discharge tests . 36
7.2.10 Dielectric tests on auxiliary and control circuits . 38
7.2.11 Voltage test as condition check . 38
– 4 – IEC TS 62271-318:2024 © IEC 2024
7.2.101 DC insulation system test .
...
IEC TS 62271-318 ®
Edition 1.0 2024-09
EXTENDED VERSION
TECHNICAL
SPECIFICATION
colour
inside
This full version of IEC TS 62271-318:2024 includes the content of the references made to
TS IEC 62271-5:2024
High-voltage switchgear and controlgear –
Part 318: DC gas-insulated metal-enclosed switchgear for rated voltages
including and above 100 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 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 62271-318 ®
Edition 1.0 2024-09
EXTENDED VERSION
TECHNICAL
SPECIFICATION
colour
inside
This full version of IEC TS 62271-318:2024 includes the content of the references made to
TS IEC 62271-5:2024
High-voltage switchgear and controlgear –
Part 318: DC gas-insulated metal-enclosed switchgear for rated voltages
including and above 100 kV
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.130.10 ISBN 978-2-8322-9762-9
– 2 – IEC TS 62271-318:2024 EXV © IEC 2024
CONTENTS
FOREWORD . 12
INTRODUCTION to IEC TS 62271-5:2024 . 14
1 Scope . 15
2 Normative references . 15
3 Terms and definitions . 18
3.1 General terms and definitions . 19
3.2 Assemblies of switchgear and controlgear . 23
3.3 Parts of assemblies . 24
3.4 Switching devices . 24
3.5 Parts of switchgear and controlgear . 25
3.6 Operational characteristics of switchgear and controlgear . 29
3.6.5 Terms and definitions relative to pressure (or density) . 30
3.6.6 Terms and definitions relating to gas and vacuum tightness . 31
3.6.7 Terms and definitions relating to liquid tightness. 33
3.7 Characteristic quantities . 34
3.8 Index of definitions . 39
4 Normal and special service conditions . 41
4.1 Normal service conditions . 41
4.1.1 General . 41
4.1.2 Indoor switchgear and controlgear . 41
4.1.3 Outdoor switchgear and controlgear . 42
4.2 Special service conditions . 43
4.2.1 General . 43
4.2.2 Altitude . 43
4.2.3 Exposure to pollution . 43
4.2.4 Temperature and humidity . 43
4.2.5 Exposure to abnormal vibrations, shock or tilting . 44
4.2.6 Wind speed . 44
4.2.7 Other parameters . 44
4.101 General . 44
5 Ratings . 45
5.1 General . 45
5.2 Rated direct voltage (U ) . 45
rd
5.2.1 General . 45
5.2.2 Rated voltages . 46
5.3 Rated insulation level (U , U , U ) . 46
dd p s
5.4 Rated continuous current (I ) . 49
rd
5.5 Rated values of short-time withstand current . 49
5.5.1 Typical waveform of short-circuit current . 49
5.5.2 Rated short-time withstand direct current (I ) . 52
kd
5.5.3 Rated peak withstand current (I ) . 52
pd
5.5.4 Rated duration of short-circuit (t ) . 52
kd
5.6 Rated supply voltage of auxiliary and control circuits (U ) . 52
a
5.6.1 General . 52
5.6.2 Rated supply voltage (U ) . 53
a
5.7 Rated supply frequency of auxiliary and control circuits . 53
6 Design and construction . 54
6.1 Requirements for liquids in switchgear and controlgear . 54
6.2 Requirements for gases in switchgear and controlgear . 54
6.3 Earthing of switchgear and controlgear . 54
6.3.101 Earthing of the main circuit . 54
6.3.102 Earthing of the enclosure . 55
6.4 Auxiliary and control equipment and circuits . 55
6.4.1 General . 55
6.4.2 Protection against electric shock . 56
6.4.3 Components installed in enclosures . 56
6.5 Dependent power operation . 59
6.6 Stored energy operation . 59
6.6.1 General . 59
6.6.2 Energy storage in gas receivers or hydraulic accumulators . 59
6.6.3 Energy storage in springs (or weights) . 59
6.6.4 Manual charging . 59
6.6.5 Motor charging . 60
6.6.6 Energy storage in capacitors . 60
6.7 Independent unlatched operation (independent manual or power operation) . 60
6.8 Manually operated actuators . 60
6.9 Operation of releases . 60
6.9.1 General . 60
6.9.2 Shunt closing release . 60
6.9.3 Shunt opening release . 60
6.9.4 Capacitor operation of shunt releases . 61
6.9.5 Under-voltage release . 61
6.10 Pressure/level indication . 61
6.10.1 Gas pressure . 61
6.10.2 Liquid level . 62
6.11 Nameplates. 62
6.11.1 General . 62
6.11.2 Application . 62
6.12 Locking devices . 63
6.13 Position indication . 64
6.14 Degrees of protection provided by enclosures . 64
6.14.1 General . 64
6.14.2 Protection of persons against access to hazardous parts and protection
of the equipment against ingress of solid foreign objects (IP coding) . 64
6.14.3 Protection against ingress of water (IP coding) . 64
6.14.4 Protection against mechanical impact under normal service conditions
(IK coding) . 64
6.15 Creepage distances for outdoor insulators . 65
6.16 Gas and vacuum tightness . 65
6.16.1 General . 65
6.16.2 Controlled pressure systems for gas . 65
6.16.3 Closed pressure systems for gas . 66
6.16.4 Sealed pressure systems . 66
6.16.101 Leakage . 66
– 4 – IEC TS 62271-318:2024 EXV © IEC 2024
6.16.102 Gas handling . 67
6.17 Tightness for liquid systems .
...
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