EN 62271-203:2004

SLOVENSKI SIST EN 62271-203:2004

STANDARD
junij 2004
High-voltage switchgear and controlgear - Part 203: Gas-insulated metal-enclosed
switchgear for rated voltages above 52 kV
ICS 29.130.10 Referenčna številka
©  Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljeno

EUROPEAN STANDARD EN 62271-203
NORME EUROPÉENNE
EUROPÄISCHE NORM February 2004

ICS 29.130.10 Supersedes EN 60517:1996 + A11:1999

English version
High-voltage switchgear and controlgear
Part 203: Gas-insulated metal-enclosed switchgear
for rated voltages above 52 kV
(IEC 62271-203:2003)
Appareillage à haute tension Hochspannungs-Schaltgeräte und
Partie 203: Appareillage sous enveloppe -Schaltanlagen
métallique à isolation gazeuse Teil 203: Gasisolierte metallgekapselte
de tensions assignées supérieures Schaltanlagen für Bemessungs-
à 52 kV spannungen von 52 kV und darüber
(CEI 62271-203:2003) (IEC 62271-203:2003)

This European Standard was approved by CENELEC on 2004-02-01. 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 Central Secretariat 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 Central Secretariat has the same status as the official versions.

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

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: rue de Stassart 35, B - 1050 Brussels

© 2004 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

Ref. No. EN 62271-203:2004 E
N 62271-203:2004 - 2 -
Foreword
The text of document 17C/312/FDIS, future edition 1 of IEC 62271-203, prepared by SC 17C, High-
voltage switchgear and controlgear assemblies, of IEC TC 17, Switchgear and controlgear, was
submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 62271-203 on
2004-02-01.
This European Standard supersedes EN 60517:1996 + A11:1999.
Significant technical changes with respect to EN 60517:1996 are as follows: deleting not used
technologies, like 3-phase PD measurements, adopting the content of EN 62271-1, Common clauses
(under preparation), and harmonisation with IEEE C37.122. This makes the standard more up to date
to today's products on the world market.
This standard is to be read in conjunction with EN 60694:1996 + A1:2000 + A2:2001, to which it refers
and which is applicable unless otherwise specified. In order to simplify the indication of corresponding
requirements, the same numbering of clauses and subclauses is used as in EN 60694. Amendments
to these clauses and subclauses are given under the same numbering, whilst additional subclauses
are numbered from 101.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2004-11-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2007-02-01
Annexes ZA and ZB have been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 62271-203:2003 was approved by CENELEC as a
European Standard without any modification.
__________
- 3 - EN 62271-203:2004
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following referenced documents are indispensable for the application 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 When an international publication has been modified by common modifications, indicated by (mod), the relevant
EN/HD applies.
Publication Year Title EN/HD Year
1) 2)
IEC 60044-1 - Instrument transformers EN 60044-1 1999
(mod) Part 1: Current transformers

1) 2)
IEC 60044-2 - Part 2: Inductive voltage transformers EN 60044-2 1999
(mod)
1) 2)
IEC 60068-2-11 - Environmental testing EN 60068-2-11 1999
Part 2: Tests - Test Ka: Salt mist

1) 2)
IEC 60137 - Insulated bushings for alternating voltages EN 60137 1996
above 1 kV
1)
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-shealthed
cables and accessories for alternating
voltages up to and including 500 kV

1)
IEC 60840 - Power cables with extruded insulation and - -
their accessories for rated voltages above
30 kV (Um=36 kV) up to 150 kV
(Um=170kV) - Test methods and
requirements
1)
IEC 60859 - Cable connections for gas-insulated metal-- -
enclosed switchgear for rated voltages of
72,5 kV and above –
Fluid-filled and extruded insulation cables -
Fluid-filled and dry type cable-terminations

1)
IEC/TS 61462 - Composite insulators – - -
Hollow insulators for use in outdoor and
indoor electrical equipment –
Definitions, test methods, acceptance
criteria and design recommendations

1)
Undated reference.
2)
Valid edition at date of issue.

N 62271-203:2004 - 4 -
Publication Year Title EN/HD Year
1)
IEC 61639 - Direct connection between power - -
transformers and gas-insulated metal-
enclosed switchgear for rated voltages of
72,5 kV and above
1) 2)
IEC 61672-1 - Electroacoustics - Sound level meters EN 61672-1 2003
Part 1: Specifications
1) 2)
IEC 61672-2 - Part 2: Pattern evaluation tests EN 61672-2 2003

1)
IEC 62067 - Power cables with extruded insulation and - -
their accessories for rated voltages above
150 kV (Um = 170 kV) up to 500 kV
(Um = 550 kV) - Test methods and
requirements
1) 2)
IEC 62155 (mod) - Hollow pressurized and unpressurized EN 62155 2003
ceramic and glass insulators for use in
electrical equipment with rated voltages
greater than 1 000 V
1) 2)
IEC 62271-100 - High-voltage switchgear and controlgear EN 62271-100 2001
Part 100: High-voltage alternating-current
circuit-breakers
1) 2)
IEC 62271-102 - Part 102: High-voltage alternating current EN 62271-102 2002
disconnectors and earthing switches

1) 2)
ISO 3231 - Paints and varnishes – EN ISO 3231 1997
Determination of resistance to humid
atmospheres containing sulphur dioxide

- 5 - EN 62271-203:2004
Annex ZB
(informative)
A-deviations
A-deviation: National deviation due to regulations, the alteration of which is for the time being outside
the competence of the CEN/CENELEC member.
This European Standard does not fall under any Directive of the EC.
In the relevant CENELEC countries these A-deviations are valid instead of the provisions of the
European Standard until they have been removed.
Clause Deviation
5.103.2 Italy (Italian pressure vessel code for electrical switchgear DM 1 December 1980 and
DM 10 September 1981 published in Gazzetta Ufficiale n° 285 dated 16.10.1981)
For metal-enclosed switchgear and controlgear containing gas-filled compartments,
the design pressure is limited to a maximum of 0,5 bar (gauge) and the volume is
limited to a maximum of 2 m . Gas filled compartments having a design pressure
exceeding 0,5 bar (gauge) or a volume exceeding 2 m shall be designed according
to the Italian pressure vessel code for electrical switchgear.

NORME CEI
INTERNATIONALE IEC
62271-203
INTERNATIONAL
Première édition
STANDARD
First edition
2003-11
Appareillage à haute tension –
Partie 203:
Appareillage sous enveloppe métallique
à isolation gazeuse de tensions assignées
supérieures à 52 kV
High-voltage switchgear and controlgear –
Part 203:
Gas-insulated metal-enclosed switchgear
for rated voltages above 52 kV
© IEC 2003 Droits de reproduction réservés ⎯ Copyright - all rights reserved
Aucune partie de cette publication ne peut être reproduite ni No part of this publication may be reproduced or utilized in any
utilisée sous quelque forme que ce soit et par aucun procédé, form or by any means, electronic or mechanical, including
électronique ou mécanique, y compris la photocopie et les photocopying and microfilm, without permission in writing from
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Pour prix, voir catalogue en vigueur
For price, see current catalogue

62271-203 © IEC:2003 – 3 –
CONTENTS
FOREWORD . 9
1 General.17
1.1 Scope .17
1.2 Normative references.17
2 Normal and special service conditions .19
2.1 Normal service conditions .19
2.2 Special service conditions .19
3 Terms and definitions.21
4 Ratings .27
4.1 Rated voltage for equipment (U ).27
r
4.2 Rated insulation level.27
4.3 Rated frequency (f ) .33
r
4.4 Rated normal current and temperature rise .33
4.5 Rated short-time withstand current (I ) .33
k
4.6 Rated peak withstand current (I ).33
p
4.7 Rated duration of short-circuit (t ) .33
k
4.8 Rated supply voltage of closing and opening devices and of auxiliary
and control circuits (U ) .33
a
4.9 Rated supply frequency of closing and opening devices and of
auxiliary circuits .33
4.10 Rated pressure of compressed gas supply for insulation and/or operation.33
5 Design and construction.35
5.1 Requirements for liquids in switchgear and controlgear .35
5.2 Requirements for gases in switchgear and controlgear .35
5.3 Earthing of switchgear and controlgear.35
5.4 Auxiliary and control equipment.37
5.5 Dependent power operation .37
5.6 Stored energy operation.37
5.7 Independent manual operation .37
5.8 Operation of releases.37
5.9 Low- and high-pressure interlocking and monitoring devices.37
5.10 Nameplates .39
5.11 Interlocking devices .39
5.12 Position indication.39
5.13 Degrees of protection by enclosures.39
5.14 Creepage distances .39
5.15 Gas and vacuum tightness .39
5.16 Liquid tightness.41
5.17 Flammability .41
5.18 Electromagnetic compatibility (EMC) .41
6 Type tests .55
6.1 General .55
6.2 Dielectric tests .59
6.3 Radio interference voltage (r.i.v.) test.67

62271-203 © IEC:2003 – 5 –
6.4 Measurement of the resistance of circuits.67
6.5 Temperature-rise tests.67
6.6 Short-time withstand current and peak withstand current tests.69
6.7 Verification of the protection.71
6.8 Gas tightness tests .71
6.9 Electromagnetic compatibility tests (EMC).73
6.10 Additional tests on auxiliary and control circuits .73
7 Routine tests.81
7.1 Dielectric test on the main circuit.83
7.2 Tests on auxiliary and control circuits.83
7.3 Measurement of the resistance of the main circuit .83
7.4 Tightness test .83
7.5 Design and visual checks.83
8 Guide to the selection of switchgear and controlgear .87
9 Information to be given with enquiries, tenders and orders.87
10 Rules for transport, storage, installation, operation and maintenance.87
10.1 Conditions during transport, storage and installation.87
10.2 Installation .89
10.3 Operation.101
10.4 Maintenance .101
11 Safety .101
12 Environmental aspects .101
Annex A (normative) Test procedure for dielectric test on three-phase encapsulated
GIS, range II .103
A.1 Dielectric procedures for three phases in one GIS enclosure .103
A.2 Application of test requirements .103
Annex B (normative) Methods for testing gas-insulated metal-enclosed switchgear
under conditions of arcing due to an internal fault .105
B.1 Introduction.105
B.2 Short-circuit current arcing test .105
B.3 Composite verification by calculation and separate tests.111
Annex C (informative) Technical and practical considerations of site testing.113
C.1 Test voltage generators.113
C.2 Locating discharges .113
C.3 Special test procedures.115
C.4 Partial discharge measurements .115
C.5 Electrical conditioning .117
C.6 Repetition tests .117
C.7 Partial discharge detection method.119

62271-203 © IEC:2003 – 7 –
Annex D (informative) Calculations related to an internal fault.125
D.1 Calculation of pressure rise due to an internal fault.125
Annex E (informative) Information to be given with enquiries, tenders and orders .127
E.1 Introduction.127
E.2 Normal and special service conditions .127
E.3 Ratings .129
E.4 Design and construction.129
E.5 Bus ducts.131
E.6 Circuit-breaker .131
E.7 Disconnector and earthing switch .133
E.8 Bushing .133
E.9 Cable connection .133
E.10 Transformer connection.133
E.11 Current transformer.135
E.12 Inductive voltage transformer .135
E.13 Documentation for enquiries and tenders.135
Bibliography .137
Figure 101 – Pressure coordination .43
Figure 102 – Example of arrangement of enclosures and gas compartments.51
Table 101 – Reference table of service conditions relevant to GIS .21
Table 102 – Preferred rated insulation levels for rated voltages for equipment of range I.29
Table 103 – Preferred rated insulation levels for rated voltages for equipment of range II.31
Table 104 – Performance criteria.45
Table 105 – Example of grouping of type tests.57
Table 106 – Test voltage for measuring PD intensity.65
Table 107 – On site test voltages.95
Table A.101 – Switching impulse test conditions above 245 kV .103

62271-203 © IEC:2003 – 9 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
HIGH-VOLTAGE SWITCHGEAR AND CONTROLGEAR –
Part 203: 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 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
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with an IEC Publication.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
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.
International Standard IEC 62271-203 has been prepared by subcommittee 17C: High-voltage
switchgear and controlgear assemblies, of IEC technical committee 17: Switchgear and
controlgear.
This first edition of IEC 62271-203 cancels and replaces the third edition of IEC 60517,
published in 1990, and constitutes a technical revision.
With the revision, significant changes from the previous edition have been made. The most
important changes are deleting not used technologies, like 3-phase PD measurements,
adopting the content to IEC 62271-1 ‘Common Clauses’ and harmonisation with IEEE C37.122.
This standard is now more up to date to today’s products on the world market.

62271-203 © IEC:2003 – 11 –
The text of this standard is based on the following documents:
FDIS Report on voting
17C/312/FDIS 17C/316/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
This International Standard should be read in conjunction with IEC 60694, second edition,
published in 1996, its Amendment 1 (2000) and its Amendment 2 (2001), to which it refers and
which is 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 60694. Amendments to these clauses and subclauses are given under the same
numbering, whilst additional subclauses, are numbered from 101.
The committee has decided that the contents of this publication will remain unchanged
until 2010. At this date, the publication will be
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.
62271-203 © IEC:2003 – 13 –
COMMON NUMBERING OF IEC 62271 PUBLICATIONS FALLING UNDER
THE RESPONSIBILITY OF SUBCOMMITTEES SC 17A AND SC 17C
In accordance with the decision taken at the joint SC 17A/SC 17C meeting in Frankfurt, June
1998 (item 20.7 of 17A/535/RM), a common numbering system has been established for the
publications falling under the responsibility of SC 17A and SC 17C. IEC 62271 – High-voltage
switchgear and controlgear is the publication number and main title element for the common
publications.
The numbering of these publications will apply the following principle.
a) Common standards prepared by SC 17A and SC 17C will start with IEC 62271-1.
b) Standards of SC 17A will start with IEC 62271-100.
c) Standards of SC 17C will start with number IEC 62271-200.
d) Publications prepared by SC 17A and SC 17C will start with number IEC 62271-300.
The table below relates the new numbers to the old numbers. The parts numbered (xxx) will be
given a final number pending the decision to publish the revised publication as standard or
technical report.
62271-203 © IEC:2003 – 15 –
Common numbering of IEC 62271 publications falling under the responsibility
of subcommittees SC 17A and SC 17C
IEC 62271 HIGH-VOLTAGE SWITCHGEAR AND CONTROLGEAR Old IEC number,
series if any
Part New title
1 Common specifications IEC 60694
2 Seismic qualification for rated voltages of 72,5 kV and above -
100 High-voltage alternating current circuit-breakers IEC 60056
101 Synthetic testing IEC 60427
102 High-voltage alternating current disconnectors and earthing switches IEC 60129
103 Switches for rated voltages above 1 kV and less than 52 kV IEC 60265-1
104 Switches for rated voltages of 52 kV and above IEC 60265-2
105 Alternating current switch-fuse combinations IEC 60420
106 Alternating current contactors and contactor-based motor-starters IEC 60470
107 Alternating current switchgear-fuse combinations -
108 Switchgear having combined functions -
109 Series capacitor by-pass switches -
200 AC metal-enclosed switchgear and controlgear for rated voltages above 1 kV IEC 60298
and up to and including 52 kV
201 Insulation-enclosed switchgear and controlgear for rated voltages up to and IEC 60466
including 52 kV
202 High-voltage/low-voltage prefabricated substations IEC 61330
203 Gas-insulated metal-enclosed switchgear for rated voltages above 52 kV IEC 60517
204 High-voltage gas-insulated transmission lines for rated voltages of 72,5 kV and IEC 61640
above
(300) Guide for seismic qualification of high-voltage alternating current circuit- IEC 61166
breakers
(301) Guide for inductive load switching IEC 61233
(302) Guide for short-circuit and switching test procedures for metal-enclosed and IEC 61633
dead tank circuit-breakers
(303) Use and handling of sulphur hexafluoride (SF ) in high-voltage switchgear and IEC 61634
controlgear
(304) Additional requirements for enclosed switchgear and controlgear from 1 kV to IEC 60932
72,5 kV to be used in severe climatic conditions
(305) Cable connections for gas-insulated metal-enclosed switchgear for rated IEC 60859
voltages above 52 kV
(306) Direct connection between power transformers and gas-insulated metal- IEC 61639
enclosed switchgear for rated voltages above 52 kV
(307) Use of electronic and associated technologies in auxiliary equipment of IEC 62063
switchgear and controlgear
308 Guide for asymmetrical short-circuit breaking test duty T100a –
309 TRV parameters for high-voltage switchgear and controlgear for rated voltages -
above 1 kV and less than 100 kV
310 Electrical endurance testing for circuit-breakers rated 72,5 kV and above -

62271-203 © IEC:2003 – 17 –
HIGH-VOLTAGE SWITCHGEAR AND CONTROLGEAR –
Part 203: Gas-insulated metal-enclosed switchgear
for rated voltages above 52 kV
1 General
1.1 Scope
This standard specifies requirements for gas-insulated, metal-enclosed switchgear in which the
insulation is obtained, at least partly, by an insulating gas 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 standard, the terms “GIS” and “switchgear” are used for “gas-insulated
metal-enclosed switchgear”.
The gas-insulated metal-enclosed switchgear covered by this standard consists of individual
components intended to be directly connected together and able to operate only in this manner.
This standard completes and amends, if necessary, the various relevant standards applying to
the individual components constituting GIS.
1.2 Normative references
The following referenced documents are indispensable for the application 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.
Subclause 1.2 of IEC 60694 is applicable with the following additions:
IEC 60044-1, Instrument transformers – Part 1: Current transformers
IEC 60044-2, Instrument transformers – Part 2: Inductive voltage transformers
IEC 60068-2-11, Environmental testing – Part 2: Tests. Test Ka: Salt mist
IEC 60137, Insulating 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 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
62271-203 © IEC:2003 – 19 –
IEC 60859, Cable connections for gas-insulated metal-enclosed switchgear for rated voltages
of 72,5 kV and above – Fluid-filled and extruded insulation cables – Fluid-filled and dry type
cable-terminations
IEC 61462, Composite insulators – Hollow insulators for use in outdoor and indoor electrical
equipment – Definitions, test methods, acceptance criteria and design recommendations
IEC 61639, Direct connection between power transformers and gas-insulated metal-enclosed
switchgear for rated voltages of 72,5 kV and above
IEC 61672-1, Electroacoustics – Sound level meters – Part 1: Specifications
IEC 61672-2, Electroacoustics – Sound level meters – Part 2: Pattern evaluation tests
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 62155, Hollow pressurized and unpressurized ceramic and glass insulators for use in
electrical equipment with rated voltages greater than 1 000 V
IEC 62271-100, High-voltage switchgear and controlgear – Part 100: High-voltage alternating-
current circuit-breakers
IEC 62271-102, High-voltage switchgear and controlgear – Part 102: Alternating current
disconnectors and earthing switches
ISO 3231, Paints and varnishes – Determination of resistance to humid atmospheres
containing sulfur dioxide
NOTE Other standards are referred to for information in this standard. They are listed in the Bibliography.
2 Normal and special service conditions
Clause 2 of IEC 60694 is applicable with the following additions:
At any altitude the dielectric characteristics of the internal insulation are identical with those
measured at sea-level. For this internal insulation, therefore, no specific requirements
concerning the altitude are applicable.
Some items of a GIS such as pressure relief devices and pressure and density monitoring
devices may be affected by altitude. The manufacturer shall take appropriate measures if
necessary.
2.1 Normal service conditions
Subclause 2.1 of IEC 60694 is applicable, taking into the account Table 101 of this standard.
2.2 Special service conditions
Subclause 2.2 of IEC 60694 is applicable, taking into account Table 101 of this standard.

62271-203 © IEC:2003 – 21 –
In case where higher than (>) is used in the table the value shall be specified by the user as
described in IEC 60694.
Table 101 – Reference table of service conditions relevant to GIS
Normal Special
Item
Indoor Outdoor Indoor Outdoor
Ambient air temperature:
–5 or –25 –25 or –40 –25 –50
Minimum (°C)
+40 +40 +50 +50
Maximum (°C)
Solar radiation (W/m ) Not applicable 1 000 Not applicable >1 000
Altitude (m) 1 000 1 000 >1 000 >1 000
a
Pollution class Not applicable II II, III or IV III or IV
Ice coating (mm) Not applicable 1, 10 or 20 Not applicable >20
Wind (m/s) Not applicable 34 Not applicable >34
Humidity (%) 95 100 98 100
Condensation or precipitation Occasional Yes Yes Yes
Vibration class Not applicable Not applicable IEC 61166 IEC 61166
Induced electromagnetic disturbances in
1,6 1,6 >1,6 >1,6
secondary system (kV)
NOTE The user’s specification may use any combination of normal or special service conditions above.
a
Pollution class II, III and IV according to Table 1 of IEC 60815.
3 Terms and definitions
For the purposes of this document, the definitions given in IEC 60694, together with the
following definitions, apply.
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
[IEV 441-12-04]
3.102
gas-insulated metal-enclosed switchgear
metal-enclosed switchgear in which the insulation is obtained, at least partly, by an insulating
gas other than air at atmospheric pressure
NOTE 1 This term generally applies to high-voltage switchgear and controlgear.
[IEV 441-12-05]
NOTE 2 Three-phase enclosed gas-insulated switchgear applies to switchgear with the three phases enclosed in
a common enclosure.
NOTE 3 Single-phase enclosed gas-insulated switchgear applies to switchgear with each phase enclosed in a
single independent enclosure.
62271-203 © IEC:2003 – 23 –
3.103
gas-insulated switchgear enclosure
part of gas-insulated metal-enclosed switchgear retaining the insulating gas under the pre-
scribed 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 The enclosure can be single-phase or three-phase.
3.104
removable link
part of the conductor which can easily be removed in order to isolate two parts of the GIS from
each other
3.105
compartment
part of gas-insulated metal-enclosed switchgear, totally enclosed except for openings
necessary for interconnection and control
NOTE A compartment may be designated by the main component contained therein, e.g. circuit-breaker
compartment, busbar compartment.
3.106
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.)
3.107
support insulator
internal insulator supporting one or more conductors
3.108
partition
support insulator of gas-insulated metal-enclosed switchgear separating one compartment from
other compartments
3.109
bushing
structure carrying one or more conductors at the terminal of the enclosure and insulating it
therefrom, including the means of attachment (e.g. air bushings)
3.110
main circuit
all the conductive parts of gas-insulated metal-enclosed switchgear included in a circuit which
is intended to transmit electrical energy
[IEV 441-13-02, modified]
3.111
auxiliary circuit
all the conductive parts of gas-insulated metal-enclosed switchgear included in a circuit (other
than the main circuit) intended to control, measure, signal and regulate
NOTE The auxiliary circuits of gas-insulated metal-enclosed switchgear include the control and auxiliary circuits of
the switching devices.
62271-203 © IEC:2003 – 25 –
3.112
design temperature of enclosures
maximum temperature that the enclosures can reach under specified maximum service
conditions
3.113
design pressure of enclosures
relative pressure used to determine the design of the enclosure
NOTE 1 It is at least equal to the maximum pressure in the enclosure at the highest temperature that the gas used
for isolation can reach under specified maximum service conditions.
NOTE 2 The transient pressure occurring during and after a breaking operation (e.g. circuit-breaker) is not to be
considered in the determination of the design pressure.
3.114
design pressure of partitions
relative pressure across the partition
3.115
operating pressure of pressure relief device
relative pressure chosen for the opening operation of pressure relief devices
3.116
routine test pressure of enclosures and partitions
relative pressure to which all enclosures and partitions are subjected after manufacturing
3.117
type test pressure of enclosures and partitions
relative pressure to which all enclosures and partitions are subjected for type test
3.118
fragmentation
damage to enclosure due to pressure rise with projection of solid material
NOTE The term “no fragmentation of the enclosure” is interpreted as follows:
– no explosion of the compartment;
– no solid parts flying off from the compartment.
Exceptions are:
– parts of the pressure relief device, if their ejection is directed;
– glowing particles and molten material resulting from burn-through of the enclosure.
3.119
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
3.120
service period
time until a maintenance, including opening of the gas compartments, is required

62271-203 © IEC:2003 – 27 –
3.121
transport unit
part of gas-insulated metal-enclosed switchgear suitable for shipment without being dismantled
4 Ratings
The ratings of GIS comprise the following:
a) rated voltage, equal to highest voltage for equipment (U );
r
b) rated insulation level;
c) rated frequency (f );
r
d) rated normal current (I ) (for main circuits);
r
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
g) rated duration of short-circuit (t );
k
h) rated values of the components forming part of gas-insulated metal-enclosed switchgear,
including their operating devices and auxiliary equipment.
4.1 Rated voltage for equipment (U )
r
Subclause 4.1 of IEC 60694 is applicable with the following addition:
NOTE 1 Components forming part of the GIS may have individual values of rated voltage for equipment in
accordance with the relevant standards.
NOTE 2 For the purpose of this standard, the rated voltage (U ) defined in IEC 60694 is rated voltage of
r
equipment (U ).
r
4.2 Rated insulation level
Subclause 4.2 and Tables 1 and 2 of IEC 60694 are applicable. Tables 102 and 103 below are
the preferred values for GIS.
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 1 According to CIGRE studies the natural ratio between the withstand voltages under standard tests, for
SF gas insulation is U / U = 0,45 and U / U = 0,75. The values U shown in Table 103 are calculated with this
6 d p s p
d
factors.
NOTE 2 Regarding the external parts of bushings (if any), refer to IEC 60137.
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 should be
based on insulation coordination studies, taking into account also the self-generated transient overvoltages due
to switching.
62271-203 © IEC:2003 – 29 –
Table 102 – Preferred rated insulation levels for rated voltages
for equipment of range I
Rated sh
...