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

Name:IEC 62271-105:2021   Standard name:High-voltage switchgear and controlgear - Part 105: Alternating current switch-fuse combinations for rated voltages above 1 kV up to and including 52 kV
Standard number:IEC 62271-105:2021   language:English language
Release Date:14-Jun-2021   technical committee:SC 17A - Switching devices
Drafting committee:MT 51 - TC 17/SC 17A/MT 51   ICS number:29.130.10 - High voltage switchgear and controlgear

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





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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
...

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