SIST EN IEC 62271-203:2022

High-voltage switchgear and controlgear - Part 203: AC gas-insulated metal-enclosed switchgear for rated voltages above 52 kV (IEC 62271-203:2022)

This part of IEC 62271 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 alternating current of rated voltages above 52 kV, for indoor and outdoor installation, and for service frequencies up to and including 60 Hz.
For the purpose of this document, the terms "GIS" and "switchgear" are used for "gas-insulated metal-enclosed switchgear".
The 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 standards applying to the individual components constituting GIS.

Hochspannungs-Schaltgeräte und -Schaltanlagen - Teil 203: Gasisolierte metallgekapselte Schaltanlagen für Bemessungsspannungen über 52 kV (IEC 62271-203:2022)

Appareillage à haute tension - Partie 203: Appareillage sous enveloppe métallique à isolation gazeuse de tensions assignées supérieures à 52 kV (IEC 62271-203:2022)

L'IEC 62271-203:2022 spécifie les exigences pour l'appareillage sous enveloppe métallique à isolation gazeuse dont l'isolation est réalisée, au moins partiellement, par un gaz isolant ou un mélange de gaz autre que l'air à la pression atmosphérique, pour courant alternatif de tensions assignées supérieures à 52 kV, pour l'installation à l'intérieur et à l'extérieur, et pour des fréquences de service inférieures ou égales à 60 Hz. Cette troisième édition annule et remplace la deuxième édition parue en 2011. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
- le document a été aligné sur l’IEC 62271-1:2017;
- outre le SF6, des gaz alternatifs ont également été mis en œuvre lorsque nécessaire;
- les termes et définitions ont été actualisés et les termes non employés ont été supprimés;
- le paragraphe 6.16 “Étanchéité au gaz et au vide” a été actualisé;
- paragraphe 6.16.3 ‘’Systèmes à pression autonome’’: Deux classes de gaz ont été présentées:
- PRC ≤ 1 000
- PRC > 1 000
et les exigences d'étanchéité relatives aux essais de type pour des gaz avec PRC > 1 000 ont été réduites de 0,5 % à 0,1 % par an et par compartiment de gaz;
- paragraphe 6.108 “Interfaces”: des pressions maximales types en service pour les interfaces reliées au PSEM ont été définies;
- les paragraphes 7.102 à 7.108 ont été restructurés;
- le paragraphe 7.107 “Essai de corrosion sur les connexions de terre” a été actualisé;
- le paragraphe 7.108 ‘’Essais de corrosion sur les systèmes d'étanchéité des enveloppes et des équipements auxiliaires’’ a été actualisé;
- l’Annexe F ‘’Continuité de service’’ a été modifiée et alignée sur les recommandations du groupe de travail B3.51 du CIGRE.

Visokonapetostne stikalne in krmilne naprave - 203. del: Plinsko izolirane stikalne naprave v kovinskih ohišjih za naznačene izmenične napetosti nad 52 kV (IEC 62271-203:2022)

Ta del standarda IEC 62271 določa zahteve za plinsko izolirane stikalne naprave v kovinskih ohišjih, ki so vsaj delno izolirane z izolirnim plinom ali mešanico plinov, drugačno od zraka pri atmosferskem tlaku, za izmenični tok naznačenih napetosti nad 52 kV za notranjo ali zunanjo namestitev in za frekvence delovanja do vključno 60 Hz.
Za namene tega standarda se za »plinsko izolirane stikalne naprave v kovinskih ohišjih« uporabljajta izraza »plinsko izolirane stikalne naprave (GIS)« in »stikalne naprave«.
Plinsko izolirane stikalne naprave v kovinskih ohišjih, zajete v tem standardu, so sestavljene iz posameznih komponent, ki se neposredno medsebojno povežejo in lahko delujejo le na ta način.
Ta standard po potrebi dopolnjuje in spreminja različne ustrezne standarde, ki veljajo za posamezne komponente plinsko izoliranih stikalnih naprav.

General Information

• Status: Published
• Publication Date: 05-Sep-2022
• ICS: 29.130.10 - High voltage switchgear and controlgear
• Technical Committee: SKA - Switchgear and control gear
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 27-Jul-2022
• Due Date: 01-Oct-2022
• Completion Date: 06-Sep-2022
• Ref Project: EN IEC 62271-203:2022 - High-voltage switchgear and controlgear - Part 203: AC gas-insulated metal-enclosed switchgear for rated voltages above 52 kV

Relations

• Replaces: SIST EN 62271-203:2012 - High-voltage switchgear and controlgear - Part 203: Gas-insulated metal-enclosed switchgear for rated voltages above 52 kV (IEC 62271-203:2011)
• Effective Date: 12-Jul-2022
• Revised: SIST EN 62271-203:2012 - High-voltage switchgear and controlgear - Part 203: Gas-insulated metal-enclosed switchgear for rated voltages above 52 kV (IEC 62271-203:2011)
• Effective Date: 22-Oct-2019

Overview

EN IEC 62271-203:2022 - High-voltage switchgear and controlgear – Part 203 - defines requirements for AC gas‑insulated metal‑enclosed switchgear (GIS) for rated voltages above 52 kV. Published as a CLC/CENELEC adoption of IEC 62271-203:2022, this standard applies to indoor and outdoor GIS installations operating at service frequencies up to 60 Hz. It replaces the 2012 edition and completes or amends component standards that apply to individual parts of a GIS assembly.

Key topics and technical requirements

The standard covers the full product lifecycle and technical envelope of GIS, including:

• Scope and terminology: clarifies the use of “GIS” and definitions for gas‑insulated metal‑enclosed switchgear.
• Normal and special service conditions: environmental and site-related conditions that affect design and testing.
• Ratings: electrical and mechanical ratings for systems above 52 kV (including the distinction of equipment ranges used for different voltage bands).
• Design and construction: requirements for enclosures, gas compartments, pressure coordination and mechanical integrity for assemblies intended to be directly interconnected.
• Type tests and routine tests: mandatory type testing and factory routine testing to ensure dielectric, mechanical and thermal performance.
• Tests for internal faults and arcing: methods and procedures for assessing behaviour under internal arcing and pressure rise (normative annexes).
• On‑site testing and commissioning guidance: recommendations for site dielectric and acceptance tests (informative annexes).
• Documentation, transport, installation, maintenance and safety: required information for enquiries, orders, and safe handling - including gas handling practices referenced to SF6 standards.
• Environmental considerations: guidance on gas specifications, re‑use and environmental influence (references to SF6 specification and reuse standards).

Practical applications and users

EN IEC 62271-203:2022 is essential for:

• Utility engineers and asset owners specifying or procuring high-voltage GIS for substations.
• GIS manufacturers and vendors designing enclosures, pressure systems and component interfaces.
• Test laboratories and inspectors performing type, routine and on‑site tests.
• Project engineers responsible for installation, commissioning, maintenance and safety documentation.
• Procurement and standards teams ensuring compliance with European/National requirements (CENELEC adoption).

Using this standard helps ensure interoperability of GIS bays, reliable dielectric and mechanical performance, safer SF6 handling, and alignment with international testing and documentation practices.

Related standards

Key referenced standards include (selection):

• EN IEC 62271-1 (common specifications for AC switchgear)
• EN IEC 62271-100, -102, -209, -211 (circuit‑breakers, disconnectors, cable & transformer connections)
• EN IEC 62271-4 (SF6 handling procedures)
• EN IEC 60376 / EN IEC 60480 (SF6 specifications and re‑use)

Keywords: EN IEC 62271-203:2022, gas-insulated switchgear, GIS, high-voltage switchgear, SF6, type tests, routine tests, design and construction, rated voltages above 52 kV.

Standards Content (Sample)

SLOVENSKI STANDARD
01-oktober-2022
Nadomešča:
SIST EN 62271-203:2012
Visokonapetostne stikalne in krmilne naprave - 203. del: Plinsko izolirane stikalne
naprave v kovinskih ohišjih za naznačene izmenične napetosti nad 52 kV (IEC
62271-203:2022)
High-voltage switchgear and controlgear - Part 203: AC gas-insulated metal-enclosed
switchgear for rated voltages above 52 kV (IEC 62271-203:2022)
Hochspannungs-Schaltgeräte und -Schaltanlagen - Teil 203: Gasisolierte
metallgekapselte Schaltanlagen für Bemessungsspannungen über 52 kV (IEC 62271-
203:2022)
Appareillage à haute tension - Partie 203: Appareillage sous enveloppe métallique à
isolation gazeuse de tensions assignées supérieures à 52 kV (IEC 62271-203:2022)
Ta slovenski standard je istoveten z: EN IEC 62271-203:2022
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.

EUROPEAN STANDARD EN IEC 62271-203

NORME EUROPÉENNE
EUROPÄISCHE NORM July 2022
ICS 29.130.10 Supersedes EN 62271-203:2012
English Version
High-voltage switchgear and controlgear - Part 203: AC gas-
insulated metal-enclosed switchgear for rated voltages above
52 kV
(IEC 62271-203:2022)
Appareillage à haute tension - Partie 203: Appareillage Hochspannungs-Schaltgeräte und -Schaltanlagen - Teil
sous enveloppe métallique à isolation gazeuse et à courant 203: Gasisolierte metallgekapselte Schaltanlagen für
alternatif de tensions assignées supérieures à 52 kV Bemessungsspannungen über 52 kV
(IEC 62271-203:2022) (IEC 62271-203:2022)
This European Standard was approved by CENELEC on 2022-07-04. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
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,
Turkey 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
© 2022 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 62271-203:2022 E

European foreword
The text of document 17C/835/FDIS, future edition 3 of IEC 62271-203, prepared by SC 17C
"Assemblies" of IEC/TC 17 "High-voltage switchgear and controlgear" was submitted to the IEC-
CENELEC parallel vote and approved by CENELEC as EN IEC 62271-203:2022.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2023-04-04
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2025-07-04
document have to be withdrawn
This document supersedes EN 62271-203:2012 and all of its amendments and corrigenda (if any).
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 Standard IEC 62271-203:2022 was approved by CENELEC as a
European Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards
indicated:
IEC 60060-1 NOTE Harmonized as EN 60060-1
IEC 60071-1:2019 NOTE Harmonized as EN IEC 60071-1:2019 (not modified)
IEC 61462 NOTE Harmonized as EN 61462
IEC 61672-1 NOTE Harmonized as EN 61672-1
IEC 61672-2 NOTE Harmonized as EN 61672-2
IEC 62155 NOTE Harmonized as EN 62155
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.cenelec.eu.
Publication Year Title EN/HD Year
IEC 60068-2-11 - Environmental testing - Part 2-11: Tests - EN IEC 60068-2-11 -
Test Ka: Salt mist
IEC 60068-2-17 - Basic environmental testing procedures - EN 60068-2-17 -
Part 2-17: Tests - Test Q: Sealing
IEC 60085 2007 Electrical insulation - Thermal evaluation EN 60085 2008
and designation
IEC 60099-4 2014 Surge arresters - Part 4: Metal-oxide surge EN 60099-4 2014
arresters without gaps for a.c. systems
IEC 60137 2017 Insulated bushings for alternating voltages EN 60137 2017
above 1000 V
IEC 60141-1 - Tests on oil-filled and gas-pressure cables - -
and their accessories - Part 1: Oil-filled,
paper or polypropylene paper laminate
insulated, metal-sheathed cables and
accessories for alternating voltages up to
and including 500 kV
IEC 60270 - High-voltage test techniques - Partial EN 60270 -
discharge measurements
IEC 60376 - Specifications of technical grade sulphur EN IEC 60376 -
hexafluoride (SF ) and complementary
gases to be used in its mixtures for use in
electrical equipment
IEC 60480 - Specifications for the re-use of sulphur EN IEC 60480 -
hexafluoride (SF ) and its mixtures in
electrical equipment
IEC 60840 - Power cables with extruded insulation and - -
their accessories for rated voltages above
30 kV (U = 36 kV) up to 150 kV (U =
m m
170 kV) - Test methods and requirements
IEC 61869-1 - Instrument transformers - Part 1: General EN 61869-1 -
requirements
IEC 61869-2 - Instrument transformers - Part 2: Additional EN 61869-2 -
requirements for current transformers
IEC 61869-3 - Instrument transformers - Part 3: Additional EN 61869-3 -
requirements for inductive voltage
transformers
IEC 62067 - Power cables with extruded insulation and - -
their accessories for rated voltages above
150 kV (U = 170 kV) up to 500 kV (U =
m m
550 kV) - Test methods and requirements
IEC 62271-1 2017 High-voltage switchgear and controlgear - EN 62271-1 2017
Part 1: Common specifications for
alternating current switchgear and
controlgear
IEC 62271-4 - High-voltage switchgear and controlgear - EN 62271-4 -
Part 4: Handling procedures for sulphur
hexafluoride (SF ) and its mixtures
IEC 62271-100 2021 High-voltage switchgear and controlgear - EN IEC 62271-100 2021
Part 100: Alternating-current circuit-
breakers
IEC 62271-102 2018 High-voltage switchgear and controlgear - EN IEC 62271-102 2018
Part 102: Alternating current disconnectors
and earthing switches
IEC 62271-209 2019 High-voltage switchgear and controlgear - EN IEC 62271-209 2019
Part 209: Cable connections for gas-
insulated metal-enclosed switchgear for
rated voltages above 52 kV - Fluid-filled
and extruded insulation cables - Fluid-filled
and dry-type cable-terminations
IEC 62271-211 2014 High-voltage switchgear and controlgear - EN 62271-211 2014
Part 211: Direct connection between power
transformers and gas-insulated metal-
enclosed switchgear for rated voltages
above 52 kV
ISO 22479 - Corrosion of metals and alloys – Sulfur - -
dioxide test in a humid atmosphere (fixed
gas method)
IEC 62271-203 ®
Edition 3.0 2022-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
High-voltage switchgear and controlgear –
Part 203: AC gas-insulated metal-enclosed switchgear for rated voltages above
52 kV
Appareillage à haute tension –
Partie 203: Appareillage sous enveloppe métallique à isolation gazeuse et à
courant alternatif de tensions assignées supérieures à 52 kV
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.130.10 ISBN 978-2-8322-3799-1
– 2 – IEC 62271-203:2022  IEC 2022
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
4 Normal and special service conditions . 10
5 Ratings . 11
6 Design and construction . 14
7 Type tests . 27
8 Routine tests . 41
9 Guide to the selection of switchgear and controlgear (informative) . 44
10 Information to be given with enquiries, tenders and orders (informative) . 44
11 Transport, storage, installation, operating instructions and maintenance. 44
12 Safety . 50
13 Influence of the product on the environment . 51
Annex A (normative) Test procedure for dielectric test on three-phase encapsulated
GIS, range II (above 245 kV) . 52
Annex B (normative) Methods for testing gas-insulated metal-enclosed switchgear
under conditions of arcing due to an internal fault . 53
Annex C (informative) Technical and practical considerations of site testing . 56
Annex D (informative) Calculation of pressure rise due to an internal fault . 61
Annex E (informative) Information to be given with enquiries, tenders and orders . 62
Annex F (informative) Service continuity . 68
Annex G (informative) List of notes concerning certain countries . 76
Bibliography . 77

Figure 1 – Pressure coordination . 19
Figure 2 – Example of arrangement of enclosures and gas compartments . 24
Figure F.1 – MRE1X (e.g. repair of disconnector to busbar) . 71
Figure F.2 – MRE00 (e.g. during visual inspection) . 71
Figure F.3 – MRE01 (e.g. repair of circuit-breaker) . 72
Figure F.4 – MRE11 (e.g. repair of disconnector) . 72
Figure F.5 – MRE11 (e.g. extension of switchgear with a feeder bay) . 73
Figure F.6 – MRE13 (e.g. repair of disconnector) . 73
Figure F.7 – MRE2X (e.g. on-site dielectric test of busbar section A) . 74
Figure F.8 – MRE2X (e.g. on-site dielectric test of busbar section 1) . 74
Figure F.9 – MRE00 (e.g. repair of circuit-breaker) . 75

Table 1 – Reference table of service conditions relevant to GIS . 11
Table 2 – Rated insulation levels for rated voltages for equipment of range I (245 kV
and below) . 12
Table 3 – Rated insulation levels for rated voltages for equipment of range II (above
245 kV) . 13

IEC 62271-203:2022  IEC 2022 – 3 –
Table 4 – Performance criteria . 20
Table 5 – Type tests . 28
Table 6 – Test voltage for measuring PD intensity . 31
Table 7 – On-site test voltages . 48
Table A.1 – Switching impulse test conditions above 245 kV . 52
Table E.1 – Normal and special service conditions . 62
Table E.2 – Ratings . 63
Table E.3 – Design and construction . 64
Table E.4 – Bus ducts . 65
Table E.5 – Bushing. 65
Table E.6 – Cable connection . 66
Table E.7 – Transformer connection . 66
Table E.8 – Current transformer . 66
Table E.9 – Inductive voltage transformer . 66
Table E.10 – Documentation for enquiries and tenders . 67

– 4 – IEC 62271-203:2022  IEC 2022
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
HIGH-VOLTAGE SWITCHGEAR AND CONTROLGEAR –

Part 203: AC gas-insulated metal-enclosed switchgear
for rated voltages above 52 kV

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
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4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
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6) All users should ensure that they have the latest edition of this publication.
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent
rights. IEC shall not be held responsible for identifying any or all such patent rights.
IEC 62271-203 has been prepared by subcommittee 17C: Assemblies, of IEC technical
committee 17: High-voltage switchgear and controlgear. It is an International Standard.
This third edition cancels and replaces the second edition published in 2011. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) the document has been aligned with IEC 62271-1:2017;
b) beside SF also alternative gases have been implemented where needed;
c) the terms and definitions have been updated and terms not used have been removed;
d) Subclause 6.16 “Gas and vacuum tightness” has been updated;

IEC 62271-203:2022  IEC 2022 – 5 –
e) Subclause 6.16.3 “Closed pressure systems”: Two classes of gas has been introduced:
1) GWP ≤ 1 000
2) GWP > 1 000
and the tightness requirements for type tests for gasses with GWP > 1 000 has been reduced
from 0,5 % to 0,1 % per year per gas compartment;
f) Subclause 6.108 “Interfaces”: Typical maximum pressures in service for interfaces
connected to GIS have been defined;
g) Subclauses 7.2 through 7.8 have been restructured;
h) Subclause 7.107 “Corrosion test on earthing connections” has been updated;
i) Subclause 7.108 “Corrosion tests on sealing systems of enclosures and auxiliary
equipment” has been updated;
j) Annex F ‘Service Continuity’ has been modified and aligned with the recommendations of
CIGRE WG B3.51.
The text of this International Standard is based on the following documents:
Draft Report on voting
17C/835/FDIS 17C/844/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/standardsdev/publications.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
– 6 – IEC 62271-203:2022  IEC 2022
HIGH-VOLTAGE SWITCHGEAR AND CONTROLGEAR –

Part 203: AC gas-insulated metal-enclosed switchgear
for rated voltages above 52 kV

1 Scope
This part of IEC 62271 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 alternating current of rated voltages above 52 kV, for indoor
and outdoor installation, and for service frequencies up to and including 60 Hz.
For the purpose of this document, the terms “GIS” and “switchgear” are used for “gas-insulated
metal-enclosed switchgear”.
The 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 standards applying to
the individual components constituting GIS.
2 Normative references
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.
IEC 60068-2-11, Environmental testing – Part 2-11: Tests – Test Ka: Salt mist
IEC 60068-2-17, Basic environmental testing procedures – Part 2-17: Tests – Test Q: Sealing
IEC 60085:2007, Electrical insulation – Thermal evaluation and designation
IEC 60099-4:2014, Surge arresters – Part 4: Metal-oxide surge arresters without gaps for a.c.
systems
IEC 60137:2017, Insulated bushings for alternating voltages above 1 000 V
IEC 60141-1, Tests on oil-filled and gas-pressure cables and their accessories – Part 1:
Oil-filled, paper or polypropylene paper laminate insulated, metal-sheathed cables and
accessories for alternating voltages up to and including 500 kV
IEC 60270, High-voltage test techniques – Partial discharge measurements
IEC 60376, Specification of technical grade sulphur hexafluoride (SF ) and complementary
gases to be used in its mixtures for use in electrical equipment
IEC 60480, Specifications for the re-use of sulphur hexafluoride (SF ) and its mixtures in
electrical equipment
IEC 62271-203:2022  IEC 2022 – 7 –
IEC 60840, Power cables with extruded insulation and their accessories for rated voltages
above 30 kV (U = 36 kV) up to 150 kV (U = 170 kV) – Test methods and requirements
m m
IEC 61869-1, Instrument transformers – Part 1: General requirements
IEC 61869-2, Instrument transformers – Part 2: Additional requirements for current transformers
IEC 61869-3, Instrument transformers – Part 3: Additional requirements for inductive voltage
transformers
IEC 62067, Power cables with extruded insulation and their accessories for rated voltages
above 150 kV (U = 170 kV) up to 500 kV (U = 550 kV) – Test methods and requirements
m m
IEC 62271-1:2017, High-voltage switchgear and controlgear – Part 1: Common specifications
for alternating current switchgear and controlgear
IEC 62271-4, High-voltage switchgear and controlgear – Part 4: Handling procedures for
sulphur hexafluoride (SF ) and its mixtures
IEC 62271-100:2021, High-voltage switchgear and controlgear – Part 100: Alternating current
circuit-breakers
IEC 62271-102:2018, High-voltage switchgear and controlgear – Part 102: Alternating current
disconnectors and earthing switches
IEC 62271-209:2019, High-voltage switchgear and controlgear – Part 209: Cable connections
for gas-insulated metal-enclosed switchgear for rated voltages above 52 kV – Fluid-filled and
extruded insulation cables – Fluid-filled and dry-type cable-terminations
IEC 62271-211:2014, High-voltage switchgear and controlgear – Part 211: Direct connection
between power transformers and gas-insulated metal-enclosed switchgear for rated voltages
above 52 kV
ISO 22479, Corrosion of metals and alloys – Sulfur dioxide test in a humid atmosphere (fixed
gas method)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 62271-1:2017 and
the following, apply.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• ISO Online browsing platform: available at https://www.iso.org/obp
• IEC Electropedia: available at http://www.electropedia.org/
3.101
metal-enclosed switchgear and controlgear
switchgear and controlgear assemblies with an external metal enclosure intended to be earthed,
and complete except for external connections
[SOURCE: IEC 60050-441:1984, 441-12-04, modified – The note was deleted.]

– 8 – IEC 62271-203:2022  IEC 2022
3.102
gas-insulated metal-enclosed switchgear
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
Note 1 to entry: This term generally applies to high-voltage switchgear and controlgear.
Note 2 to entry: Three-phase enclosed gas-insulated switchgear applies to switchgear with the three phases
enclosed in a common enclosure.
Note 3 to entry: Single-phase enclosed gas-insulated switchgear applies to switchgear with each phase enclosed
in a single independent enclosure.
[SOURCE: IEC 60050-441:1984, 441-12-05, modified – "or gas mixture” has been added in the
definition, and Note 2 and 3 to entry have been added.]
3.103
gas-insulated switchgear enclosure
part of gas-insulated metal-enclosed switchgear retaining the insulating gas under the
prescribed conditions necessary to maintain safely the highest insulation level, protecting the
equipment against external influences and providing a high degree of protection to personnel
Note 1 to entry: The enclosure can be single-phase or three-phase.
3.104
isolating link
part of the conductor which can easily be opened or removed in order to isolate two parts of the
GIS from each other
Note 1 to entry: The open gap is designed to withstand the test voltages across isolating distance according Table 2
and Table 3.
Note 2 to entry: The purpose of an isolating link is to ensure electrical isolation between sections of a GIS e.g.
during maintenance and repair work.
3.105
removable link
part of the conductor which can easily be opened or removed in order to separate two parts of
the GIS from each other
Note 1 to entry: The open gap is designed to withstand the phase-to-earth test voltages according to Table 2 and
Table 3.
Note 2 to entry: The purpose of a removable link is to ensure electrical separation between sections of a GIS, where
the equipment is separated from the rest of the GIS, e.g. in front of voltage transformers, surge arresters, cable
connections and transformer connections during high voltage testing of GIS or testing of the components.
3.106
compartment
part of gas-insulated metal-enclosed switchgear, which is gastight and enclosed
Note 1 to entry: A compartment can be designated by the main component contained therein, e.g. circuit-breaker
compartment, busbar compartment.
3.107
component
essential part of the main or earthing circuits of gas-insulated metal-enclosed switchgear which
serves a specific function (for example circuit-breaker, disconnector, switch, fuse, instrument
transformer, bushing, busbar, etc.)
3.108
support insulator
internal insulator supporting one or more conductors

IEC 62271-203:2022  IEC 2022 – 9 –
3.109
partition
gas tight support insulator of gas-insulated metal-enclosed switchgear separating two adjacent
compartments
3.110
bushing
a device that enables one or several conductors to pass through an enclosure and insulate the
conductors from it
[SOURCE: IEC 60050-471:2007, 471-02-01, modified – “an enclosure” inserted after “pass
through” and “a partition such as a wall or a tank” deleted. Notes 1 and 2 were deleted.]
3.111
main circuit
all the conductive parts of gas-insulated metal-enclosed switchgear included in a circuit which
is intended to transmit electrical energy
[SOURCE: IEC 60050-441:1984, 441-13-02, modified – “gas-insulated metal-enclosed
switchgear” inserted after “parts of” and “an assembly” deleted]
3.112
auxiliary circuit
all the conductive parts of gas-insulated metal-enclosed switchgear included in a circuit
intended to control, measure, signal and regulate
Note 1 to entry: The auxiliary circuits of gas-insulated metal-enclosed switchgear include the control and auxiliary
circuits of the switching devices.
3.113
enclosure design temperature
maximum temperature that the enclosures can reach under specified maximum service
conditions
3.114
enclosure design pressure
relative pressure used to determine the design of the enclosure
Note 1 to entry: It is at least equal to the maximum pressure in the enclosure at the highest temperature that the
gas used for insulation can reach under specified maximum service conditions.
Note 2 to entry: The transient pressure occurring during and after a breaking operation (e.g. circuit-breaker) is not
considered in the determination of the design pressure.
3.115
partition design pressure
relative pressure across the partition used to determine the design of the partition
Note 1 to entry: It is at least equal to the maximum differential pressure across the partition during maintenance
activities.
Note 2 to entry: The transient pressure occurring during and after a breaking operation (e.g. circuit-breaker) is not
considered in the determination of the design pressure.
3.116
operating pressure
relative pressure chosen for the opening operation of pressure relief
devices
– 10 – IEC 62271-203:2022  IEC 2022
3.117
routine test pressure
relative pressure to which all enclosures and partitions are
subjected after manufacturing
3.118
type test pressure
relative pressure to which enclosures and partitions are subjected
for type test
3.119
fragmentation
damage to enclosure due to pressure rise with projection of solid material
3.120
disruptive discharge
phenomena associated with the failure of insulation under electric stress, in which the discharge
completely bridges the insulation under test, reducing the voltage between the electrodes to
zero or almost zero
3.121
transport unit
part of gas-insulated metal-enclosed switchgear suitable for shipment without being dismantled
3.122
functional unit
part of metal-enclosed switchgear and controlgear comprising all the components of the main
circuits and auxiliary circuits that contribute to the fulfilment of a single function
Note 1 to entry: Functional units can be distinguished according to the function for which they are intended, for
example complete single-phase or three-phase bay or functional parts of a bay like complete circuit-breaker,
disconnector, earthing switch, voltage transformer, current transformer, operating mechanism, enclosure, etc.
[SOURCE: IEC 60050-441:1984, 441-13-04, modified – In the definition, “metal-enclosed”
inserted after “part of” and “an assembly of” deleted. In the note the examples have been
exchanged with examples relevant for GIS.]
4 Normal and special service conditions
4.1 Normal service conditions
Subclause 4.1 of IEC 62271-1:2017 is applicable, taking into account the recommended values
presented in Table 1 of this document.
4.2 Special service conditions
Subclause 4.2 of IEC 62271-1:2017 is applicable, taking into account the recommended values
presented in Table 1 of this document.
In the cases where higher than (>) is used in Table 1, the values shall be specified by the user
as described in IEC 62271-1:2017.

IEC 62271-203:2022  IEC 2022 – 11 –
4.101 General
Table 1 – Reference table of service conditions relevant to GIS
Normal Special
Item
Indoor Outdoor Indoor Outdoor
Ambient air temperature:
Minimum (°C) –5 –25 –25 –50
Maximum (°C) +40 +40 +50 +50
Not applicable 1 000 Not applicable >1 000
Solar radiation (W/m )
Altitude (m) 1 000 1 000 >1 000 >1 000
a
Not applicable c c, d or e d or e
Site pollution severity
Ice coating (mm) Not applicable 20 Not applicable >20
Wind (m/s) Not applicable 34 Not applicable >34
Average humidity over 24 h (%) 95 100 98 100
Condensation or precipitation Occasional Yes Yes Yes
Abnormal vibrations, shock or tilting Not applicable Not applicable Applicable Applicable
NOTE The user’s specification can use any combination of normal or special service conditions above.
a 1
Site pollution severity c, d or e according to IEC TS 60815-1:2008, 8.3 [5]
At any altitude the dielectric characteristics of the internal insulation are identical with those
measured at sea-level. For this internal insulation no specific requirements concerning the
altitude are applicable.
Some items of a GIS such as pressure relief devices and pressure and density monitoring
devices can be affected by altitude. The manufacturer shall take appropriate measures if
necessary.
5 Ratings
5.1 General
Subclause 5.1 of IEC 62271-1:2017 is applicable with the following modifications:
e) rated short-time withstand current (I ) (for main and earthing circuits);
k
f) rated peak withstand current (I ) (for main and earthing circuits);
p
and with the following addition:
k) rated values of the components forming part of gas-insulated metal-enclosed switchgear,
including their operating devices and auxiliary equipment.
5.2 Rated voltage (U )
r
Subclause 5.2 of IEC 62271-1:2017 is applicable with the following addition:
Components forming part of the GIS can have individual values of rated for equipment in
accordance with the relevant standards.
___________
Numbers in square brackets refer to the Bibliography.

– 12 – IEC 62271-203:2022  IEC 2022

5.3 Rated insulation level (U , U , U )
d p s
Subclause 5.3 of IEC 62271-1:2017 is applicable with the following addition:
Tables 1, 2, 3 and 4 in Subclause 5.3 of IEC 62271-1:2017 are replaced with Table 2 and
Table 3 below.
NOTE 1 The higher values for GIS in IEC 62271-203 compared to the values in IEC 62271-1 were introduced with
revision 1 in 2003. They have now been established as standard values.
The GIS comprises components having a definite insulation level. Although internal faults can
largely be avoided by the choice of a suitable insulation level, measures to limit external
overvoltages (e.g. surge arresters,) should be considered.
NOTE 2 Regarding the external parts of bushings (if any), see to IEC 60137:2017.
NOTE 3 The waveforms are standardized lightning impulse and switching impulse shapes, pending the results of
studies on the ability of this equipment to withstand other types of impulses.
NOTE 4 The choice between alternative insulation levels for a particular rated voltage for equipment can be based
on insulation coordination studies, taking into account also the self-generated transient overvoltages due
to switching.
Table 2 – Rated insulation levels for rated voltages
for equipment of range I (245 kV and below)
Rated short-duration power-frequency Rated lightning impulse
withstand voltage withstand voltage
U U
d p
Rated voltage for
equipment
kV (RMS value) kV (peak value)
U
r
Phase-to-earth, Phase-to-earth,
across open Across across open Across
kV (RMS value)
switching device the isolating switching device the isolating
and between distance and between distance
phases phases
(1) (2) (3) (4) (5)
72,5 140 160 325 375
100 185 210 450 520
123 230 265 550 630
145 275 315 650 750
170 325 375 750 860
245 460 530 1 050 1 200
NOTE Values in column (2) are applicable:
a) for type tests, phase-to-earth and between phases;
b) for routine tests, phase-to-earth, phase-to-phase, and across the open switching device.
Values in columns (3), (4) and (5) are applicable for type tests only.

IEC 62271-203:2022  IEC 2022 – 13 –
Table 3 – Rated insulation levels for rated voltages for equipment of range II
(above 245 kV)
Rated short-duration Rated lightning
Rated switching impulse
power-frequency impulse
withstand voltage
withstand voltage withstand voltage
U
s
U U
d p
Rated
kV (peak value)
voltage for
kV (RMS value) kV (peak value)
equipment
Between Across Phase-to- Across open
Phase-to- Across Phase-to-
U
r
earth and open earth and phases isolating earth and switching
between switching across (Notes 3 distance between device
kV (RMS
phases device open and 4) (Notes 1, 2 phases and/or
value)
(Notes 3 and/or switching and 3) (Note 5) isolating
and 5) isolating device distance
distance (Note 5) (Notes 2
(Note 3) and 3)
(1) (2) (3) (4) (5) (6) (7) (8)
300 460 595 850 1 275 700 ([phone] (+170)
362 520 675 950 1 425 800 ([phone] (+205)
420 650 815 1 050 1 575 900 ([phone] (+240)
550 710 925 1 175 1 760 900 ([phone] (+315)
800 960 1 270 1 425 2 420 1 100 ([phone] (+455)
1 100 1 550 2 635 1 550 +(900) 2 250 2 250 + (630)
1 100 1 100
1 100
1 800 2 880 1 675 +(900) 2 400 2 400 + (630)
+(635)
1 200 1 800 2 970 2 400 2 400 + (685)
1 200 1 200 1 675 +(980)
1 200
1 950 3 120 2 550 2 550 + (685)
+(695)
NOTE 1 Column (6) is also applicable to some circuit-breakers, see IEC 62271-100:2021.
NOTE 2 In column (6), values in brackets are the peak values of the power-frequency voltage U
2 / 3 applied
r
to the opposite terminal (combined voltage).
In column (8), values in brackets are the peak values of the power-frequency voltage 0,7 U 2 / 3 applied to
r
the opposite terminal (combined voltage).
NOTE 3 Values in column (2) are applicable:
a) for type tests, phase-to-earth and between phases;
b) for routine tests, phase-to-earth, phase-to-phase, and across the open switching device.
Values in columns (3), (4), (5), (6), (7) and (8) are applicable for type tests only.
NOTE 4 These values are derived using the multiplying factors stated in Table 3 of IEC 60071-1:2019 [4].
NOTE 5 For earthing switches only phase-to-earth tests according column (2), (4) and (7) are applicable.
5.4 Rated frequency (f )
r
Subclause 5.4 of IEC 62271-1:2017 is applicable.
)
5.5 Rated continuous current (I
r
Subclause 5.5 of IEC 62271-1:2017 is applicable with the following addition:
Some main circuits of GIS (e.g. busbars, feeder circuits, etc.) can have different values of rated
continuous current. However, these values should also be selected from R10 series.

– 14 – IEC 62271-203:2022  IEC 2022
5.6 Rated short-time withstand current (I )
k
Subclause 5.6 of IEC 62271-1:2017 is applicable.
5.7 Rated peak withstand current (I )
p
Subclause 5.7 of IEC 62271-1:2017 is applicable.
5.8 Rated duration of short-circuit (t )
k
Subclause 5.8 of IEC 62271-1:2017 is applicable.
5.9 Rated supply voltage of auxiliary and control circuits (U )
a
Subclause 5.9 of IEC 62271-1:2017 is applicable.
5.10 Rated supply frequency of auxiliary and control circuits
Subclause 5.10 of IEC 62271-1:2017 is applicable.
5.11 Rated pressure of compressed gas supply for controlled pressure systems
Subclause 5.11 of IEC 62271-1:2017 is applicable.
6 Design and construction
6.1 Requirements for liquids in switchgear and controlgear
Subclause 6.1 of IEC 62271-1:2017 is applicable.
6.2 Requirements for gases in switchgear and controlgear
Subclause 6.2 of IEC 62271-1:2017 is applicable.
6.3 Earthing of switchgear and controlgear
Subclause 6.3 of IEC 62271-1:2017 is applicable.
6.3.101 Earthing of the main circuit
To ensure safety during maintenance work, all parts of the main circuit to which access is
required or provided shall be capable of being earthed.
Earthing can be made by:
a) earthing switches with a making capacity equal to the rated peak withstand current, if there
is still a possibility that the circuit connected is energised;
b) earthing switches without a making capacity or with a making capacity lower than the rated
peak withstand current, if there is certainty that the circuit connected is not energised.
Furthermore, it shall be possible, after opening the enclosure, to connect removable
earthing devices for the duration of the work on a circuit element previously earthed via
an earthing switch. The removable earthing device shall have the relevant short-circuit
withstand capability and/or induced current withstand capability.
The earthing circuit can be degraded after being subjected to the short-circuit current. After
such event, earthing circuit can need to be replaced.

IEC 62271-203:2022  IEC 2022 – 15 –
6.3.102 Earthing of the enclosure
The enclosures shall be connected to earth. All metal parts which do not belong to a main or
an auxiliary circuit shall be earthed. For the interconnection of enclosures, frames, etc.,
fastening (e.g. bolting or welding) is acceptable for providing electrical continuity.
The continuity of the earthing circuits shal
...