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

IEC 62271-203:2022 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. 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:
- the document has been aligned with IEC 62271-1:2017;
- beside SF6 also alternative gases have been implemented where needed;
- the terms and definitions have been updated and terms not used have been removed;
- Subclause 6.16 “Gas and vacuum tightness” has been updated;
- Subclause 6.16.3 “Closed pressure systems”: Two classes of gas has been introduced:
- GWP ≤ 1 000
- 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;
- Subclause 6.108 “Interfaces”: Typical maximum pressures in service for interfaces connected to GIS have been defined;
- Subclauses 7.102 through 7.108 have been restructured;
- Subclause 7.107 “Corrosion test on earthing connections” has been updated;
- Subclause 7.108 “Corrosion tests on sealing systems of enclosures and auxiliary equipment” has been updated;
- Annex F ‘Service Continuity’ has been modified and aligned with the recommendations of CIGRE WG B3.51.

Appareillage à haute tension - Partie 203: Appareillage sous enveloppe métallique à isolation gazeuse et à courant alternatif de tensions assignées supérieures à 52 kV

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.

General Information

Status
Published
Publication Date
29-May-2022
Technical Committee
Current Stage
PPUB - Publication issued
Completion Date
30-May-2022
Ref Project

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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
IEC 62271-203:2022-05(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
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

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 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

---------------------- Page: 4 ----------------------
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

---------------------- Page: 5 ----------------------
– 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

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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;
---------------------- Page: 6 ----------------------
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.
---------------------- Page: 7 ----------------------
– 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
---------------------- Page: 8 ----------------------
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.]
---------------------- Page: 9 ----------------------
– 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
---------------------- Page: 10 ----------------------
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
---------------------- Page: 11 ----------------------
– 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 sing
...

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