CLC IEC/TS 62271-5:2025

SLOVENSKI STANDARD
01-februar-2026
Visokonapetostne stikalne in krmilne naprave - 5. del: Skupne specifikacije za
stikalne in krmilne naprave za enosmerni tok (IEC/TS 62271-5:2024)
High-voltage switchgear and controlgear - Part 5: Common specifications for direct
current switchgear and controlgear (IEC/TS 62271-5:2024)
Hochspannungs-Schaltgeräte und -Schaltanlagen - Teil 5: Gemeinsame Bestimmungen
für Gleichstrom-Schaltgeräte und -Schaltanlagen (IEC/TS 62271-5:2024)
Appareillage à haute tension - Partie 5: Spécifications communes pour appareillage à
courant continu (IEC/TS 62271-5:2024)
Ta slovenski standard je istoveten z: CLC IEC/TS 62271-5:2025
ICS:
29.130.10 Visokonapetostne stikalne in High voltage switchgear and
krmilne naprave controlgear
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

TECHNICAL SPECIFICATION CLC IEC/TS 62271-5

SPÉCIFICATION TECHNIQUE
TECHNISCHE SPEZIFIKATION December 2025
ICS 29.130.10
English Version
High-voltage switchgear and controlgear - Part 5: Common
specifications for direct current switchgear and controlgear
(IEC/TS 62271-5:2024)
Appareillage à haute tension - Partie 5: Spécifications Hochspannungs-Schaltgeräte und -Schaltanlagen - Teil 5:
communes pour appareillage à courant continu Gemeinsame Bestimmungen für Gleichstrom-Schaltgeräte
(IEC/TS 62271-5:2024) und -Schaltanlagen
(IEC/TS 62271-5:2024)
This Technical Specification was approved by CENELEC on 2025-12-08.

CENELEC members are required to announce the existence of this TS in the same way as for an EN and to make the TS available promptly
at national level in an appropriate form. It is permissible to keep conflicting national standards in force.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Türkiye and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2025 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. CLC IEC/TS 62271-5:2025 E

European foreword
This document (CLC IEC/TS 62271-5:2025) consists of the text of IEC/TS 62271-5:2024 prepared by
IEC/TC 17 "High-voltage switchgear and controlgear".
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
Any feedback and questions on this document should be directed to the users’ national committee. A
complete listing of these bodies can be found on the CENELEC website.
Endorsement notice
The text of the International Technical Specification/Technical Report IEC/TS 62271-5:2024 was
approved by CENELEC as a European Technical Specification/Technical Report without any
modification.
In the official version, for Bibliography, the following notes have to be added for the standard indicated:
IEC/TS 62271-314 NOTE Approved as CLC IEC/TS 62271-314
IEC/TS 62271-316 NOTE Approved as CLC IEC/TS 62271-316
IEC/TS 62271-318 NOTE Approved as CLC IEC/TS 62271-318
IEC 60034-1 NOTE Approved as EN 60034-1
IEC 60051-1 NOTE Approved as EN 60051-1
IEC 60051-2 NOTE Approved as EN IEC 60051-2
IEC 60051-4 NOTE Approved as EN IEC 60051-4
IEC 60051-5 NOTE Approved as EN IEC 60051-5
IEC 60059 NOTE Approved as EN 60059
IEC 60064 NOTE Approved as EN 60064
IEC 60068-2 series NOTE Approved as EN IEC 60068-2 series
IEC 60073 NOTE Approved as EN 60073
IEC 60081 NOTE Approved as EN 60081
IEC 60130 series NOTE Approved as EN 60130 series
IEC 60228 NOTE Approved as EN IEC 60228
IEC 60269-1 NOTE Approved as EN IEC 60269-1
IEC 60309-1 NOTE Approved as EN IEC 60309-1
IEC 60309-2 NOTE Approved as EN IEC 60309-2
IEC 60393-1 NOTE Approved as EN 60393-1
IEC 60445 NOTE Approved as EN IEC 60445
IEC 60447 NOTE Approved as EN 60447
IEC 60664-1 NOTE Approved as EN IEC 60664-1
IEC 60669-1 NOTE Approved as EN 60669-1
IEC 60695-1 series NOTE Approved as EN 60695-1 series
IEC 60695-7 series NOTE Approved as EN 60695-7 series
IEC 60721-1 NOTE Approved as EN 60721-1
IEC 60721-2 series NOTE Approved as EN 60721-2 series
IEC 60721-2-2 NOTE Approved as EN IEC 60721-2-2
IEC 60721-2-4 NOTE Approved as EN IEC 60721-2-4
IEC 60721-3 series NOTE Approved as EN IEC 60721-3 series
IEC 60721-3-4 NOTE Approved as EN IEC 60721-3-4
IEC 60730-2-9 NOTE Approved as EN IEC 60730-2-9
IEC 60730-2-13 NOTE Approved as EN IEC 60730-2-13
IEC 60947-2 NOTE Approved as EN IEC 60947-2
IEC 60947-3 NOTE Approved as EN IEC 60947-3
IEC 60947-4-1 NOTE Approved as EN IEC 60947-4-1
IEC 60947-4-2 NOTE Approved as EN IEC 60947-4-2
IEC 60947-5-1 NOTE Approved as EN IEC 60947-5-1
IEC 60947-7-1 NOTE Approved as EN IEC 60947-7-1
IEC 60947-7-2 NOTE Approved as EN 60947-7-2
IEC 61020-1 NOTE Approved as EN IEC 61020-1
IEC 61810 series NOTE Approved as EN 61810 series
IEC 61810-1 NOTE Approved as EN 61810-1
IEC 61810-2 NOTE Approved as EN 61810-2
IEC 61850 series NOTE Approved as EN 61850 series
IEC 61936-1:2021 NOTE Approved as EN IEC 61936-1:2021 (not modified) +A11:2025
IEC 62271-3:2015 NOTE Approved as EN 62271-3:2015 (not modified)
IEC 62326-1 NOTE Approved as EN 62326-1
IEC 62501 NOTE Approved as EN IEC 62501
IEC 62612 NOTE Approved as EN 62612
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
NOTE 1  Where an International Publication has been modified by common modifications, indicated by (mod), the
relevant EN/HD applies.
NOTE 2  Up-to-date information on the latest versions of the European Standards listed in this annex is available
here: www.cencenelec.eu.
Publication Year Title EN/HD Year
IEC 60038 (mod) 2009 IEC standard voltages EN 60038 2011
IEC 60050-614 2016 International Electrotechnical Vocabulary - - -
Part 614: Generation, transmission and
distribution of electricity - Operation
IEC 60050-811 - International electrotechnical vocabulary - - -
Part 811: Electric traction
IEC 60050-826 2022 International Electrotechnical Vocabulary - -
(IEV) - Part 826: Electrical installations
IEC 60060-1 - High-voltage test techniques - Part 1: EN IEC 60060-1 -
General terminology and test requirements
IEC 60068-2-1 2007 Environmental testing - Part 2-1: Tests - EN 60068-2-1 2007
Test A: Cold
IEC 60068-2-2 2007 Environmental testing - Part 2-2: Tests - EN 60068-2-2 2007
Test B: Dry heat
IEC 60068-2-17 1994 Basic environmental testing procedures - EN 60068-2-17 1994
Part 2-17: Tests - Test Q: Sealing
IEC 60068-2-30 2005 Environmental testing - Part 2-30: Tests - EN 60068-2-30 2005
Test Db: Damp heat, cyclic (12 h + 12 h
cycle)
IEC 60071-1 2019 Insulation co-ordination - Part 1: EN IEC 60071-1 2019
Definitions, principles and rules
IEC 60071-2 2018 Insulation co-ordination - Part 2: EN IEC 60071-2 2018
Application guidelines
IEC 60071-11 2022 Insulation co-ordination - Part EN IEC 60071-11 2022
11:Definitions, principles and rules for
HVDC system
IEC 60085 2007 Electrical insulation - Thermal evaluation EN 60085 2008
and designation
IEC 60255-21-1 1988 Electrical relays - Part 21: Vibration, shock, EN 60255-21-1 1995
bump and seismic tests on measuring
relays and protection equipment - Section
One: Vibration tests (sinusoidal)
Publication Year Title EN/HD Year
IEC 60270 - High-voltage test techniques - Charge- EN IEC 60270 -
based measurement of partial discharges
IEC 60296 - Fluids for electrotechnical applications - EN IEC 60296 -
Mineral insulating oils for electrical
equipment
IEC 60376 - Specification of technical grade sulphur EN IEC 60376 -
hexafluoride (SF6) and complementary
gases to be used in its mixtures for use in
electrical equipment
IEC 60417 2006 Graphical symbols for use on equipment - -
IEC 60437 - Radio interference test on high-voltage EN IEC 60437 -
insulators
IEC 60480 - Specifications for the re-use of sulphur EN IEC 60480 -
hexafluoride (SF6) and its mixtures in
electrical equipment
IEC 60512-2-2 - Connectors for electronic equipment - EN 60512-2-2 -
Tests and measurements - Part 2-2:
Electrical continuity and contact resistance
tests - Test 2b: Contact resistance -
Specified test current method
IEC 60529 1989 Degrees of protection provided by EN 60529 1991
enclosures (IP Code)
- - + AC 1993
+ A1 1999 + A1 2000
+ A2 2013 + A2 2013
IEC 60633 2019 High-voltage direct current (HVDC) EN IEC 60633 2019
transmission - Vocabulary
IEC/TS 60815-4 2019 Selection and dimensioning of high-voltage - -
insulators intended for use in polluted
conditions - Part 4: Insulators for d.c.
systems
IEC 61000-4-4 - Electromagnetic compatibility (EMC) - Part EN 61000-4-4 -
4-4: Testing and measurement techniques
- Electrical fast transient/burst immunity
test
IEC 61000-4-11 - Electromagnetic compatibility (EMC) - Part EN IEC 61000-4-11 -
4-11: Testing and measurement
techniques - Voltage dips, short
interruptions and voltage variations
immunity tests for equipment with input
current up to 16 A per phase
IEC 61000-4-17 1999 Electromagnetic compatibility (EMC) - Part EN 61000-4-17 1999
4-17: Testing and measurement
techniques - Ripple on d.c. input power
port immunity test
IEC 61000-4-18 - Electromagnetic compatibility (EMC) - Part EN IEC 61000-4-18 -
4-18: Testing and measurement
techniques - Damped oscillatory wave
immunity test
Publication Year Title EN/HD Year
IEC 61000-4-29 - Electromagnetic compatibility (EMC) - Part EN 61000-4-29 -
4-29: Testing and measurement
techniques - Voltage dips, short
interruptions and voltage variations on d.c.
input power port immunity tests
IEC 61000-6-2 - Electromagnetic compatibility (EMC) - Part EN IEC 61000-6-2 -
6-2: Generic standards - Immunity
standard for industrial environments
IEC 61000-6-5 - Electromagnetic compatibility (EMC) - Part EN 61000-6-5 -
6-5: Generic standards - Immunity for
equipment used in power station and
substation environment
IEC 61180 - High-voltage test techniques for low- EN 61180 -
voltage equipment - Definitions, test and
procedure requirements, test equipment
IEC/TS 61245 - Artificial pollution tests on high-voltage - -
ceramic and glass insulators to be used on
d.c. systems
IEC 61810-7 2006 Electromechanical elementary relays - Part EN 61810-7 2006
7: Test and measurement procedures
IEC 62262 2002 Degrees of protection provided by EN 62262 2002
enclosures for electrical equipment against
external mechanical impacts (IK code)
IEC 62271-1 2017 High-voltage switchgear and controlgear - EN 62271-1 2017
Part 1: Common specifications for
alternating current switchgear and
controlgear
+ AMD1 2021 + A1 2021
IEC 62271-4 - High-voltage switchgear and controlgear - EN IEC 62271-4 -
Part 4: Handling procedures for gases for
insulation and/or switching
CISPR 11 (mod) 2015 Industrial, scientific and medical equipment EN 55011 2016
- Radio-frequency disturbance
characteristics - Limits and methods of
measurement
- - + A11 2020
CISPR 16-1 series Specification for radio disturbance and EN IEC 55016-1 series
immunity measuring apparatus and
methods
CISPR/TR 18-2 - Radio interference characteristics of - -
overhead power lines and high-voltage
equipment - Part 2: Methods of
measurement and procedure for
determining limits
IEC TS 62271-5 ®
Edition 1.0 2024-05
TECHNICAL
SPECIFICATION
SPECIFICATION
TECHNIQUE
High-voltage switchgear and controlgear –

Part 5: Common specifications for direct current switchgear and controlgear

Appareillage à haute tension –

Partie 5: Spécifications communes pour appareillage à courant continu

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.130.10  ISBN 978-2-8327-0252-9

– 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

IEC TS 62271-5:2024 © IEC 2024 – 3 –
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 . 47
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 operation . 57
7 Type tests . 58
7.1 General . 58
7.1.1 Basics . 58
7.1.2 Information for identification of test objects . 58
7.1.3 Information to be included in type-test reports . 58
7.2 Dielectric tests . 59
7.2.1 General . 59
7.2.2 Ambient air conditions during tests . 59
7.2.3 Wet test procedure . 60
7.2.4 Arrangement of the equipment . 60
7.2.5 Criteria to pass the test . 60
7.2.6 Application of the test voltage and test conditions . 61
7.2.7 Tests of switchgear and controlgear . 63
7.2.8 Artificial pollution tests for outdoor insulators . 65
7.2.9 Partial discharge tests . 65
7.2.10 Dielectric tests on auxiliary and control circuits . 65
7.2.11 Voltage test as condition check . 65
7.3 Resistance measurement . 66
7.3.1 Measurement of the resistance of auxiliary contacts class 1 and class 2 . 66
7.3.2 Measurement of the resistance of auxiliary contacts class 3 . 66
7.3.3 Electrical continuity of earthed metallic parts test . 66
7.3.4 Resistance measurement of contacts and connections in the main
circuit as a condition check . 66
7.4 Continuous current tests. 67
7.4.1 Condition of the test object . 67
7.4.2 Arrangement of the equipment . 67
7.4.3 Test current and duration . 68
7.4.4 Temperature measurement during test . 69
7.4.5 Resistance of the main circuit . 70
7.4.6 Criteria to pass test . 70
7.5 Short-time withstand current and peak withstand current tests . 74
7.5.1 General . 74
7.5.2 Arrangement of the equipment and of the test circuit . 74
7.5.3 Test current and duration . 75
7.5.4 Conditions of the test object after test . 76
7.6 Verification of the protection . 76
7.6.1 Verification of the IP coding . 76
7.6.2 Verification of the IK coding . 76
7.7 Tightness tests . 77
7.7.1 General . 77
7.7.2 Controlled pressure systems for gas . 78
7.7.3 Closed pressure systems for gas . 78
7.7.4 Sealed pressure systems . 79
7.7.5 Liquid tightness tests . 79
7.8 Electromagnetic compatibility tests (EMC) . 79

IEC TS 62271-5:2024 © IEC 2024 – 5 –
7.8.1 Emission tests . 79
7.8.2 Immunity tests on auxiliary and control circuits . 82
7.8.3 Additional EMC tests on auxiliary and control circuits . 85
7.9 Additional tests on auxiliary and control circuits . 86
7.9.1 General . 86
7.9.2 Functional tests . 86
7.9.3 Verification of the operational characteristics of auxiliary contacts . 86
7.9.4 Environmental tests . 87
7.9.5 Dielectric test . 88
7.10 X-radiation test for vacuum interrupters . 88
7.10.1 General requirements . 88
7.10.2 Test voltage and measurement procedure . 90
7.10.3 Acceptance criteria . 90
8 Routine tests . 91
8.1 General . 91
8.2 Dielectric test on the main circuit . 91
8.3 Tests on auxiliary and control circuits . 91
8.3.1 Inspection of auxiliary and control circuits, and verification of conformity
to the circuit diagrams and wiring diagrams . 91
8.3.2 Functional tests . 92
8.3.3 Verification of protection against electrical shock . 92
8.3.4 Dielectric tests . 92
8.4 Measurement of the resistance of the main circuit . 92
8.5 Tightness test . 93
8.5.1 General . 93
8.5.2 Controlled pressure systems for gas . 93
8.5.3 Closed pressure systems for gas . 93
8.5.4 Sealed pressure systems . 93
8.5.5 Liquid tightness tests . 93
8.6 Design and visual checks . 93
9 Guide to the selection of switchgear and controlgear (informative) . 94
9.1 General . 94
9.2 Selection of rated values . 94
9.3 Cable-interface considerations . 94
9.4 Continuous or temporary overload due to changed service conditions . 94
9.5 Environmental aspects . 94
9.5.1 Service conditions . 94
9.5.2 Clearances affected by service conditions . 94
9.5.3 High humidity . 94
9.5.4 Solar radiation . 95
10 Information to be given with enquiries, tenders and orders (informative) . 95
10.1 General . 95
10.2 Information with enquiries and orders . 95
10.3 Information with tenders . 96
11 Transport, storage, installation, operating instructions and maintenance . 97
11.1 General . 97
11.2 Conditions during transport, storage and installation . 97
11.3 Installation . 97
11.3.1 General . 97

– 6 – IEC TS 62271-5:2024 © IEC 2024
11.3.2 Unpacking and lifting . 97
11.3.3 Assembly . 98
11.3.4 Mounting . 98
11.3.5 Connections . 98
11.3.6 Information about gas and gas mixtures for controlled and closed
pressure systems . 98
11.3.7 Final installation inspection . 99
11.3.8 Basic input data by the user . 99
11.3.9 Basic input data by the manufacturer . 99
11.4 Operating instructions . 100
11.5 Maintenance . 100
11.5.1 General . 100
11.5.2 Information about fluids and gas to be included in maintenance manual . 100
11.5.3 Recommendations for the manufacturer . 100
11.5.4 Recommendations for the user . 101
11.5.5 Failure report . 102
12 Safety . 103
12.1 General . 103
12.2 Precautions by manufacturers . 104
12.3 Precautions by users . 104
13 Influence of the product on the environment . 105
Annex A (informative) Examples of HVDC side switchgear arrangement for one pole in
an HVDC substation . 106
Annex B (informative) Exposure to pollution . 108
B.1 General . 108
B.2 Minimum requirements for switchgear in normal service condition . 108
B.3 Minimum requirements for switchgear in special service condition . 108
Annex C (informative) Preferred insulation levels for rated voltages lower than 105 kV . 109
Annex D (informative) Short-circuit current in HVDC systems . 110
D.1 VSC HVDC . 110
D.2 LCC HVDC . 111
D.3 Special case of LCC HVDC DC faults – LCC as diode bridge . 111
D.4 HVDC systems with DC circuit-breakers . 113
D.5 Calculation of the rated short-time withstand direct current. 114
D.6 Calculation of Joule integral value (E ) . 115
j
Annex E (informative) References for auxiliary and control circuit components . 116
Annex F (informative) List of symbols . 118
Annex G (normative) Method for the weatherproofing test for outdoor switchgear and
controlgear . 120
Annex H (normative) Tolerances on test quantities during tests . 123
Annex I (informative) Extension of validity of type tests . 126
I.1 General . 126
I.2 Dielectric tests . 126
I.3 Short-time withstand current and peak withstand current tests . 126
I.4 Electromagnetic immunity test on auxiliary and control circuits . 126
I.5 Environmental tests on auxiliary and control circuits . 126
Annex J (normative) Identification of test objects . 128
J.1 General . 128

IEC TS 62271-5:2024 © IEC 2024 – 7 –
J.2 Data . 128
J.3 Drawings. 128
Annex K (informative) Test circuit for superimposed impulse voltage tests . 130
K.1 General . 130
K.2 Test circuit using blocking capacitor . 130
K.3 Test circuit using sphere gap . 130
Annex L (informative) Information and technical requirements to be given with
enquiries, tenders and orders . 132
L.1 General . 132
L.2 Normal and special service conditions (refer to Clause 4) . 132
L.3 Ratings (refer to Clause 5) . 133
L.4 Design and construction (refer to Clause 6) . 133
L.5 System information . 134
L.6 Documentation for enquiries and tenders . 134
Annex M (informative) Electromagnetic compatibility on site . 135
Annex N (informative) Standardization activities of HVDC . 136
Bibliography . 137

Figure 1 – Schematic representation of superimposed impulse voltage tests . 40
Figure 2 – Typical waveform of a short-circuit current in an HVDC system . 42
Figure 3 – Examples of classes of contacts . 49
Figure 4 – Diagram of connections of a switching device . 62
Figure 5 – Test sequence for polarity reversal tests . 65
Figure 6 – Diagram of a test circuit for the radio interference voltage test . 81
Figure 7 – Test location of radiation survey instrument . 90
Figure A.1 – Example of HVDC side switchgear arrangeme
...