IEC TS 62271-5:2024

IEC TS 62271-5 ®
Edition 1.0 2024-05
TECHNICAL
SPECIFICATION
High-voltage switchgear and controlgear –
Part 5: Common specifications for direct current switchgear and controlgear

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IEC TS 62271-5 ®
Edition 1.0 2024-05
TECHNICAL
SPECIFICATION
High-voltage switchgear and controlgear –

Part 5: Common specifications for direct current switchgear and controlgear

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.130.10  ISBN 978-2-8322-8774-3

– 2 – IEC TS 62271-5:2024 © IEC 2024
CONTENTS
FOREWORD . 9
INTRODUCTION . 11
1 Scope . 12
2 Normative references . 12
3 Terms and definitions . 14
3.1 General terms and definitions . 14
3.2 Assemblies of switchgear and controlgear . 19
3.3 Parts of assemblies . 19
3.4 Switching devices . 19
3.5 Parts of switchgear and controlgear . 21
3.6 Operational characteristics of switchgear and controlgear . 25
3.6.5 Terms and definitions relative to pressure (or density) . 26
3.6.6 Terms and definitions relating to gas and vacuum tightness . 27
3.6.7 Terms and definitions relating to liquid tightness. 29
3.7 Characteristic quantities . 29
3.8 Index of definitions . 30
4 Normal and special service conditions . 33
4.1 Normal service conditions . 33
4.1.1 General . 33
4.1.2 Indoor switchgear and controlgear . 33
4.1.3 Outdoor switchgear and controlgear . 34
4.2 Special service conditions . 34
4.2.1 General . 34
4.2.2 Altitude . 34
4.2.3 Exposure to pollution . 35
4.2.4 Temperature and humidity . 35
4.2.5 Exposure to abnormal vibrations, shock or tilting . 35
4.2.6 Wind speed . 35
4.2.7 Other parameters . 35
5 Ratings . 36
5.1 General . 36
5.2 Rated direct voltage (U ) . 36
rd
5.2.1 General . 36
5.2.2 Rated voltages . 37
5.3 Rated insulation level (U , U , U ) . 37
dd p s
5.4 Rated continuous current (I ) . 40
rd
5.5 Rated values of short-time withstand current . 40
5.5.1 Typical waveform of short-circuit current . 40
5.5.2 Rated short-time withstand direct current (I ) . 43
kd
5.5.3 Rated peak withstand current (I ) . 43
pd
5.5.4 Rated duration of short-circuit (t ) . 43
kd
5.6 Rated supply voltage of auxiliary and control circuits (U ) . 43
a
5.6.1 General . 43
5.6.2 Rated supply voltage (U ) . 44
a
5.7 Rated supply frequency of auxiliary and control circuits . 44

6 Design and construction . 45
6.1 Requirements for liquids in switchgear and controlgear . 45
6.2 Requirements for gases in switchgear and controlgear . 45
6.3 Earthing of switchgear and controlgear . 45
6.4 Auxiliary and control equipment and circuits . 45
6.4.1 General . 45
6.4.2 Protection against electric shock . 46
6.4.3 Components installed in enclosures . 46
6.5 Dependent power operation . 50
6.6 Stored energy operation . 50
6.6.1 General . 50
6.6.2 Energy storage in gas receivers or hydraulic accumulators . 50
6.6.3 Energy storage in springs (or weights) . 50
6.6.4 Manual charging . 50
6.6.5 Motor charging . 51
6.6.6 Energy storage in capacitors . 51
6.7 Independent unlatched operation (independent manual or power operation) . 51
6.8 Manually operated actuators . 51
6.9 Operation of releases . 51
6.9.1 General . 51
6.9.2 Shunt closing release . 52
6.9.3 Shunt opening release . 52
6.9.4 Capacitor operation of shunt releases . 52
6.9.5 Under-voltage release . 52
6.10 Pressure/level indication . 52
6.10.1 Gas pressure . 52
6.10.2 Liquid level . 52
6.11 Nameplates. 53
6.11.1 General . 53
6.11.2 Application . 53
6.12 Locking devices . 54
6.13 Position indication . 55
6.14 Degrees of protection provided by enclosures . 55
6.14.1 General . 55
6.14.2 Protection of persons against access to hazardous parts and protection
of the equipment against ingress of solid foreign objects (IP coding) . 55
6.14.3 Protection against ingress of water (IP coding) . 55
6.14.4 Protection against mechanical impact under normal service conditions
(IK coding) . 55
6.15 Creepage distances for outdoor insulators . 55
6.16 Gas and vacuum tightness . 56
6.16.1 General . 56
6.16.2 Controlled pressure systems for gas . 56
6.16.3 Closed pressure systems for gas . 56
6.16.4 Sealed pressure systems . 56
6.17 Tightness for liquid systems . 57
6.17.1 General . 57
6.17.2 Leakage rates . 57
6.18 Fire hazard (flammability) . 57

– 4 – IEC TS 62271-5:2024 © IEC 2024
6.19 Electromagnetic compatibility (EMC) . 57
6.20 X-ray emission . 57
6.21 Corrosion . 57
6.22 Filling levels for insulation, switching and/or operatio
...