High-voltage switchgear and controlgear - Part 204: Rigid gas-insulated transmission lines for rated voltage above 52 kV

IEC 62271-204:2022 is available as IEC 62271-204:2022 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.IEC 62271-204:2022 applies to rigid HV gas‑insulated transmission lines (GIL) 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, and for service frequencies up to and including 60 Hz. This second edition cancels and replaces the first edition published in 2011. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
- update to be in line with IEC 62271-1:2017 and alignment of the voltage ratings and the test voltages.
- addition of new information for welds on pressurized parts and gas tightness.

Appareillage à haute tension - Partie 204: Lignes de transport rigides à isolation gazeuse de tension assignée supérieure à 52 kV

IEC 62271-204:2022 est disponible sous forme de IEC 62271-204:2022 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.L’IEC 62271-204:2022 est applicable aux lignes de transport rigides haute tension à isolation gazeuse (LIG) dont l’isolation est réalisée, au moins partiellement, par un gaz isolant ou un mélange gazeux autre que l’air à la pression atmosphérique, pour un courant alternatif de tension assignée supérieure à 52 kV, pour des fréquences de service inférieures ou égales à 60 Hz. Cette deuxième édition annule et remplace la première édition parue en 2011. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
- mise à jour par rapport à l’IEC 62271-1:2017 et alignement des caractéristiques assignées de tension et des tensions d’essai;
- ajout de nouvelles informations relatives aux soudures sur les parties sous pression et à l’étanchéité au gaz.

General Information

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

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IEC 62271-204
Edition 2.0 2022-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
High-voltage switchgear and controlgear –
Part 204: Rigid gas-insulated transmission lines for rated voltage above 52 kV
Appareillage à haute tension –
Partie 204: Lignes de transport rigides à isolation gazeuse de tension assignée
supérieure à 52 kV
IEC 62271-204:2022-05(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 62271-204
Edition 2.0 2022-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
High-voltage switchgear and controlgear –
Part 204: Rigid gas-insulated transmission lines for rated voltage above 52 kV
Appareillage à haute tension –
Partie 204: Lignes de transport rigides à isolation gazeuse de tension assignée
supérieure à 52 kV
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.130.10 ISBN 978-2-8322-3804-2

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 62271-204:2022 © IEC 2022
CONTENTS

FOREWORD ........................................................................................................................... 3

1 Scope .............................................................................................................................. 5

2 Normative references ...................................................................................................... 5

3 Terms and definitions ...................................................................................................... 6

4 Normal and special service conditions ............................................................................. 8

5 Ratings ............................................................................................................................ 9

6 Design and construction ................................................................................................ 10

7 Type tests ..................................................................................................................... 21

8 Routine tests ................................................................................................................. 28

9 Guide to the selection of GIL (informative) ..................................................................... 29

10 Information to be given with enquiries, tenders and orders (informative) ........................ 30

11 Transport, storage, installation, operating instructions and maintenance........................ 32

12 Safety ............................................................................................................................ 38

13 Influence of the product on the environment .................................................................. 39

Annex A (informative) Estimation of continuous current ....................................................... 40

Annex B (informative) Earthing ............................................................................................ 45

Annex C (informative) Long-term testing of buried installations ............................................ 49

Annex D (normative) Requirements for welds on pressurized parts ...................................... 51

Bibliography .......................................................................................................................... 53

Figure B.1 – Example of earthing system together with active anti-corrosion system in

the case of solid bonding of the enclosure at both ends ........................................................ 48

Table 1 – Second characteristic numeral of IP coding ........................................................... 14

Table D.1 – Quantity of NDTs ............................................................................................... 51

Table D.2 – Acceptance criteria of imperfections .................................................................. 52

---------------------- Page: 4 ----------------------
IEC 62271-204:2022 © IEC 2022 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
HIGH-VOLTAGE SWITCHGEAR AND CONTROLGEAR –
Part 204: Rigid gas-insulated transmission lines
for rated voltage 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

in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,

Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their

preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with

may participate in this preparatory work. International, governmental and non-governmental organizations liaising

with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for

Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.

2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international

consensus of opinion on the relevant subjects since each technical committee has representation from all

interested IEC National Committees.

3) IEC Publications have the form of recommendations for international use and are accepted by IEC National

Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC

Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any

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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 62271-204 has been prepared by subcommittee 17C: Assemblies, of IEC technical

committee 17: High-voltage switchgear and controlgear. It is an International Standard.

This second edition cancels and replaces the first 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) update to be in line with IEC 62271-1:2017 and alignment of the voltage ratings and the test

voltages.
b) addition of new information for welds on pressurized parts and gas tightness.
---------------------- Page: 5 ----------------------
– 4 – IEC 62271-204:2022 © IEC 2022
The text of this document is based on the following documents:
Draft Report on voting
17C/840/FDIS 17C/846/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.

This document is to be read in conjunction with IEC 62271-1:2017 and IEC 62271-203:2022, to

which it refers and which are applicable unless otherwise specified. In order to simplify the

indication of corresponding requirements, the same numbering of clauses and subclauses is

used as in IEC 62271-1:2017 and IEC 62271-203:2022. Amendments to these clauses and

subclauses are given under the same numbering, whilst additional subclauses are numbered

from 101.

A list of all parts of the IEC 62271 series can be found, under the general title High-voltage

switchgear and controlgear, on the IEC website.

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: 6 ----------------------
IEC 62271-204:2022 © IEC 2022 – 5 –
HIGH-VOLTAGE SWITCHGEAR AND CONTROLGEAR –
Part 204: Rigid gas-insulated transmission lines
for rated voltage above 52 kV
1 Scope

This part of IEC 62271 applies to rigid HV gas-insulated transmission lines (GIL) 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, and for service

frequencies up to and including 60 Hz.

This document is applicable where the provisions of IEC 62271-203 do not cover the application

of GIL (see Note 3).

At each end of the HV gas-insulated transmission line, a specific element is used for the

connection between the HV gas-insulated transmission line and other equipment like bushings,

power transformers or reactors, cable boxes, metal-enclosed surge arresters, voltage

transformers or GIS, covered by their own specification.

Unless otherwise specified, the HV gas-insulated transmission line is designed to be used under

normal service conditions.

NOTE 1 In this document, the term "HV gas-insulated transmission line" is abbreviated to "GIL".

NOTE 2 In this document, the word "gas" means gas or gas mixture, as defined by the manufacturer.

NOTE 3 Examples of GIL applications:

– where all or part of the HV gas-insulated transmission line is directly buried;

– where the HV gas-insulated transmission line is located, wholly or partly, in an area accessible to public;

– where the HV gas-insulated transmission line is long (typically longer than 500 m) and the typical gas

compartment length exceeds the common practice of GIS technology.
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 60060-1:2010, High-voltage test techniques – Part 1: General definitions and test

requirements
IEC 60068-1:2013, Environmental testing – Part 1: General and guidance

IEC 60229:2007, Electric cables – Tests on extruded oversheaths with a special protective

function

IEC 60287-3-1:2017, Electric cables – Calculation of the current rating – Part 3-1: Operating

conditions – Site reference conditions

IEC 60376, Specification of technical grade sulfur hexafluoride (SF ) and complementary gases

to be used in its mixtures for use in electrical equipment
---------------------- Page: 7 ----------------------
– 6 – IEC 62271-204:2022 © IEC 2022

IEC 60480, Specifications for the re-use of sulfur hexafluoride (SF ) and its mixtures in

electrical equipment
IEC 60529:1989, Degrees of protection provided by enclosures (IP Code)
IEC 60529:1989/AMD1:1999
IEC 60529:1989/AMD2:2013

IEC 62271-1:2017, High-voltage switchgear and controlgear – Part 1: Common specifications

for alternating current switchgear and controlgear

IEC 62271-203:2022, High-voltage switchgear and controlgear – Part 203: AC gas-insulated

metal-enclosed switchgear for rated voltages above 52 kV

IEC 62271-4:2013, High-voltage switchgear and controlgear – Part 4: Handling procedures for

sulphur hexafluoride (SF ) and its mixtures
ISO 9606 (all parts), Qualification test of welders – Fusion welding

ISO 9712, Non-destructive testing – Qualification and certification of NDT personnel

ISO 14732, Welding personnel – Qualification testing of welding operators and weld setters for

mechanized and automatic welding of metallic materials

ISO 15609 (all parts), Specification and qualification of welding procedures for metallic

materials – Welding procedure specification

ISO 15614 (all parts), Specification and qualification of welding procedures for metallic

materials – Welding procedure test
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:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.101
area accessible to public
area accessible without restriction to any person

Note 1 to entry: A GIL installed above the ground and outside a substation is considered to be "installed in an area

accessible to public".
3.102
gas-insulated transmission lines
GIL

metal-enclosed lines in which the insulation is obtained, at least partly, by an insulating gas

other than air at atmospheric pressure, with the external enclosure intended to be earthed

3.103
GIL enclosure

part of GIL retaining the insulating gas under the required conditions protecting the equipment

against external influences and providing a high degree of protection to personnel

---------------------- Page: 8 ----------------------
IEC 62271-204:2022 © IEC 2022 – 7 –
3.104
compartment

part of GIL totally gastight enclosed except for openings necessary for interconnection and

control
3.105
partition

gas tight support insulator of gas-insulated metal-enclosed switchgear separating two adjacent

compartments
3.106
main circuit

all the conductive parts of GIL included in a circuit which is intended to transmit electrical energy

[SOURCE: IEC 60050-441:1984, 441-13-02, modified – Replacement of “an assembly" by

“GIL".]
3.107
ambient air temperature

temperature, determined under required conditions, of the air surrounding the external GIL

enclosure in case of installation in open air, open trenches or tunnels

[SOURCE: IEC 60050-441:1984, 441-11-13, modified – Replacement of “complete switching

device or fuse" by “external GIL enclosure in case of installation in open air, open trenches or

tunnels".]
3.108
design temperature of the enclosure

maximum temperature which can be reached on a GIL enclosure under service conditions

3.109
design pressure of the enclosure
relative pressure used to determine the design of the enclosure

Note 1 to entry: It is at least equal to the maximum relative pressure in the enclosure at the design temperature of

the enclosure.
3.110
design pressure of the partitions
relative pressure across the partition

Note 1 to entry: It is at least equal to the maximum differential pressure across the partition during maintenance

activities.
3.111
disconnecting unit

unit to electrically isolate one side from another of the main circuit, mainly for site testing or

maintenance
3.112
disruptive discharge

phenomenon associated with the failure of insulation under electric stress, in which the dis-

charge completely bridges the insulation, reducing the voltage between the electrodes to zero

or almost zero

Note 1 to entry: The term applies to discharges in solid, liquid and gaseous dielectrics and to combinations of these.

Note 2 to entry: A disruptive discharge in a solid dielectric produces permanent loss of dielectric strength (non-self-

restoring insulation); in a liquid or gaseous dielectric, the loss can be only temporary (self-restoring insulation).

---------------------- Page: 9 ----------------------
– 8 – IEC 62271-204:2022 © IEC 2022

Note 3 to entry: The term "sparkover" is used when a disruptive discharge occurs in a gaseous or liquid dielectric.

The term "flashover" is used when a disruptive discharge occurs over the surface of a solid dielectric in a gaseous

or liquid medium. The term "puncture" is used when a disruptive discharge occurs through a solid dielectric.

3.113
GIL section

part of GIL which is defined by operational or other requirements such as maximum length for

dielectric testing or installation sequence
Note 1 to entry: A GIL can consist on the assembly of several GIL sections.
Note 2 to entry: It can consist of one or more compartments.
Note 3 to entry: Sections can be segregated by disconnecting units.
4 Normal and special service conditions
4.1 Normal service conditions
4.1.1 General
Subclause 4.1.1 of IEC 62271-1:2017 is applicable with the following addition.

The normal service conditions which apply to a GIL depending on the installation conditions are

given in 4.101, 4.102 and 4.103. When more than one of these installation conditions apply, the

relevant subclause shall apply to each section of the GIL.
4.1.2 Indoor switchgear and controlgear
Subclause 4.1.2 of IEC 62271-1:2017 is applicable.
4.1.3 Outdoor switchgear and controlgear
Subclause 4.1.3 of IEC 62271-1:2017 is applicable.
4.2 Special service conditions
Subclause 4.2 of IEC 62271-1:2017 is applicable.
4.101 Installation in open air

For determining the ratings of GIL for open air installation, the normal service conditions of

IEC 62271-1:2017 shall apply. These are also valid for open trenches.

If the actual service conditions differ from the normal service conditions, the ratings shall be

adapted accordingly.
4.102 Buried installation
General values for thermal resistivity and soil temperature are:
– 1,2 K · m/W, and 20 °C in summer;
– 0,85 K · m/W, and 10 °C in winter.
For guidance, values given in IEC 60287-3-1 can be considered.

For long distance transmission lines (several kilometres), site measurement of soil resistivity

should also be considered.

NOTE 1 The use of controlled backfill with a given soil thermal resistivity can also be considered.

---------------------- Page: 10 ----------------------
IEC 62271-204:2022 © IEC 2022 – 9 –

NOTE 2 A risk of thermal runaway exists if the soil surrounding the buried GIL becomes dry. In order not to dry out

the soil, a maximum service temperature of the enclosure in the range of 50 °C to 60 °C is generally considered

acceptable.

The depth of laying should be agreed between manufacturer and user. The determination of

depth of laying shall take into account thermo mechanical stresses, safety requirements and

local regulations.
4.103 Installation in tunnel, shaft or similar situation

Forced cooling is an adequate method to handle with the waste heat and can be used in case

of tunnel, shaft or similar installations.

In the case of long vertical shafts and inclined tunnels or sections thereof, attention shall be

paid to thermal and density gradients.
5 Ratings
5.1 General
Subclause 5.1 of IEC 62271-1:2017 is not applicable and is replaced as follows.
The rating of a GIL consists of the following:
a) rated voltage (U );
b) rated insulation level (U , U , U ;
d p s)
c) rated frequency (f );
d) rated continuous current (I );
e) rated short-time withstand current (I ) (for main and earthing circuits);
f) rated peak withstand current (I ) (for main and earthing circuits);
g) rated duration of short-circuit (t );
h) rated supply voltage of auxiliary and control circuits (U );
i) rated supply frequency of auxiliary and control circuits.
5.2 Rated voltage (U )
Subclause 5.2 of IEC 62271-1:2017 is applicable.
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:

Rated insulation levels shall be chosen from IEC 62271-203 on the basis of insulation

coordination study for the specific installation in order to consider parameters like overvoltages,

voltage reflections, etc. Specific insulation coordination studies are recommended for each

installation. For more information, see [1] .

Although internal arcing faults can largely be avoided by the choice of a suitable insulation level,

measures to limit external overvoltages at each end of the installation (e.g. surge arresters)

should be considered.
___________
Numbers in square brackets refer to the Bibliography.
---------------------- Page: 11 ----------------------
– 10 – IEC 62271-204:2022 © IEC 2022
5.4 Rated frequency (f )
Subclause 5.4 of IEC 62271-1:2017 is applicable.
5.5 Rated continuous current (I )
Subclause 5.5 of IEC 62271-1:2017 is applicable with the following addition:

The rated continuous current is defined for a single or a three-phase GIL installed above ground

with an ambient air temperature at 40 °C. For other installation conditions, the maximum

allowable continuous current can differ from the rated continuous current. See Annex A.

5.6 Rated short-time withstand current (I )
Subclause 5.6 of IEC 62271-1:2017 is applicable.
5.7 Rated peak withstand current (I )
Subclause 5.7 of IEC 62271-1:2017 is applicable.
5.8 Rated duration of short-circuit (t )
Subclause 5.8 of IEC 62271-1:2017 is applicable.
5.9 Rated supply voltage of auxiliary and control circuits (U )
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 not applicable.
6 Design and construction
Clause 6 of IEC 62271-1:2017 is applicable, except as follows.

Any GIL equipment which requires routine preventive maintenance or diagnostic testing should

be easily accessible.

GIL should be designed so that normal service, inspection and maintenance operations can be

carried out safely, including the checking of phase sequence after erection and extension.

The equipment should be designed such that the mechanical stress caused by all relevant loads,

for example thermal expansion, agreed permitted movement of foundations, external vibration,

earthquakes, soil loading, wind and ice, do not impair the assigned performance of the

equipment.
6.1 Requirements for liquids in GIL
Subclause 6.1 of IEC 62271-1:2017 is not applicable.
---------------------- Page: 12 ----------------------
IEC 62271-204:2022 © IEC 2022 – 11 –
6.2 Requirements for gases in GIL

Subclause 6.2 of IEC 62271-1:2017 is applicable. In case a gas mixture is used, the

manufacturer should provide information about the gas characteristics such as dielectric

strength, mixing ratio, process of mixing and filling pressure.
NOTE See references [2], [3] and [4].
6.3 Earthing
Subclause 6.3 of IEC 62271-1:2017 is applicable, with the following additions.
6.3.101 Earthing of the main circuits

To ensure safety during maintenance work, all parts of the main circuits to which access is

required or provided shall be capable of being earthed. In addition, it shall be possible, after

the opening of the enclosure, to connect earth electrodes to the conductor for the duration of

the work.
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 live;

b) earthing switches without a short-circuit making capability or with a short-circuit making

capability lower than the rated peak withstand current, if there is a certainty that the circuit

connected is not live, or
c) removable earthing devices, only by agreement bet
...

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