SIST EN 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

EN IEC 62271-9 is applicable to single and three phase direct connections between gas-insulated metal-enclosed switchgear (GIS) for rated voltages above 52 kV and transformer arrangements to establish electrical and mechanical interchange ability and to determine the limits of supply of for the transformer connection. Direct connections are immersed on one end in the transformer oil or insulating gas and on the other end in the insulating gas of the switchgear. Transformer arrangements are single-phase transformers with single-phase enclosed arrangement, three-phase transformers with three single-phase enclosed arrangements or three-phase transformers with a three-phase enclosed arrangement with three transformer bushings. The connection satisfies the requirements of IEC 62271-203 for gas-insulated metal-enclosed switchgear, IEC 60076 for power transformer and IEC 60137 for completely immersed bushings. For the purpose of this international standard the term "switchgear" is used for "gas-insulated metal-enclosed switchgear".

Hochspannungs-Schaltgeräte und -Schaltanlagen - Teil 211: Direkte Verbindungen zwischen Leistungstransformatoren und gasisolierten metallgekapselten Schaltanlagen für Bemessungsspannungen über 52 kV

Appareillage à haute tension - Partie 211: Raccordements directs entre transformateurs de puissance et appareillage sous enveloppe métallique à isolation gazeuse de tensions assignées supérieures à 52 kV

L'IEC 62271-211:2014 est applicable aux raccordements directs monophasés et triphasés entre l'appareillage sous enveloppe métallique à isolation gazeuse (GIS) pour des tensions assignées supérieures à 52 kV et des dispositions de transformateurs pour établir des possibilités d'échanges électriques et mécaniques et pour déterminer  les limites d'alimentation pour le raccordement du transformateur. Cette première édition annule et remplace la première édition de l'IEC TR 61639:1996. Cette édition constitue une révision technique.  Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:  a) passage de l'état de rapport technique à l'état de norme internationale;  b) la caractéristique assignée de tension minimale passe de 72,5 kV à au-dessus de 52 kV;  c) mise à jour des références normatives;  d) définition de la jonction isolée incluant la limite d'alimentation;  e) définition de l'essai diélectrique de l'appareillage sous enveloppe métallique à isolation gazeuse pour le raccordement du transformateur dans une enveloppe triphasée;  f) ajout des tolérances d'interface du côté du transformateur;  g) ajout des tolérances du transformateur en service;  h) ajout de charges exceptionnelles pour les traversées et les brides;  i) prise en considération des transformateurs à isolation à huile et gazeuse;  j) inclusion des raccordements directs triphasés sous enveloppe.

Visokonapetostne stikalne in krmilne naprave - 211. del: Neposredna povezava med elektroenergetskimi transformatorji in plinsko izoliranimi stikalnimi napravami v kovinskih ohišjih za naznačene napetosti nad 52 kV (IEC 62271-211:2014)

Standard EN IEC 62271-9 se uporablja za enofazne in trifazne neposredne povezave med plinsko izoliranimi stikalnimi napravami v kovinskih ohišjih (GIS) za naznačene napetosti nad 52 kV in transformatorskimi sestavi, da se ugotovi sposobnost električne in mehanske izmenjave ter določijo omejitve napajanja za transformatorsko povezavo. Neposredne povezave so na enem koncu potopljene v transformatorsko olje ali izolirni plin ter na drugi strani v izolirni plin stikalne naprave. Transformatorski sestavi so enofazni transformatorji z enofaznim vgrajenim sestavom, trifazni transformatorji s tremi enofaznimi vgrajenimi sestavi ali trifazni transformatorji s trifaznim vgrajenim sestavom s tremi transformatorskimi skoznjiki. Povezava izpolnjuje zahteve standarda IEC 62271-203 za plinsko izolirane stikalne naprave v kovinskih ohišjih, standarda IEC 60076 za elektroenergetske transformatorje in standarda IEC 60137 za popolnoma potopljene skoznjike. Za namene tega mednarodnega standarda se za »plinsko izolirane stikalne naprave v kovinskih ohišjih« uporablja izraz »stikalne naprave«.

General Information

• Status: Published
• Publication Date: 15-Jul-2014
• 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: 09-Jul-2014
• Due Date: 13-Sep-2014
• Completion Date: 16-Jul-2014
• Ref Project: EN 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

Relations

• Corrected By: SIST EN 62271-211:2014/AC:2015 - High-voltage switchgear and controlgear - Part 211: Direct connection between power transformers and gas-insulated metal-enclosed switchgear for rated voltages above 52 kV
• Effective Date: 01-Nov-2015
• Corrected By: SIST EN 62271-211:2014/AC:2017 - High-voltage switchgear and controlgear - Part 211: Direct connection between power transformers and gas-insulated metal-enclosed switchgear for rated voltages above 52 kV n (IEC 62271-211:2014/COR2:2017)
• Effective Date: 29-Aug-2017
• Revised: oSIST prEN IEC 62271-211:2023 - High-voltage switchgear and controlgear - Part 211: Direct connection between power transformers and gas-insulated metal-enclosed switchgear for rated voltages above 52 kV
• Effective Date: 23-Jan-2023
• Revised: oSIST prEN IEC 62271-211:2023 - High-voltage switchgear and controlgear - Part 211: Direct connection between power transformers and gas-insulated metal-enclosed switchgear for rated voltages above 52 kV
• Effective Date: 08-Feb-2022

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN 62271-211:2014
01-september-2014
9LVRNRQDSHWRVWQHVWLNDOQHLQNUPLOQHQDSUDYHGHO1HSRVUHGQDSRYH]DYD
PHGHOHNWURHQHUJHWVNLPLWUDQVIRUPDWRUMLLQSOLQVNRL]ROLUDQLPLVWLNDOQLPL
QDSUDYDPLYNRYLQVNLKRKLãMLK]DQD]QDþHQHQDSHWRVWLQDGN9,(&

High-voltage switchgear and controlgear - Part 211: Direct connection between power
transformers and gas-insulated metal-enclosed switchgear for rated voltages above 52
kV
Ta slovenski standard je istoveten z: EN 62271-211:2014
ICS:
29.130.10 Visokonapetostne stikalne in High voltage switchgear and
krmilne naprave controlgear
SIST EN 62271-211:2014 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 62271-211:2014

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SIST EN 62271-211:2014


EUROPEAN STANDARD EN 62271-211

NORME EUROPÉENNE

EUROPÄISCHE NORM
June 2014
ICS 29.130.10

English Version
High-voltage switchgear and controlgear - Part 211: Direct
connection between power transformers and gas-insulated
metal-enclosed switchgear for rated voltages above 52 kV
(IEC 62271-211:2014)
Appareillage à haute tension - Partie 211: Raccordements Hochspannungs-Schaltgeräte und -Schaltanlagen - Teil
directs entre transformateurs de puissance et appareillage 211: Direkte Verbindungen zwischen
sous enveloppe métallique à isolation gazeuse de tensions Leistungstransformatoren und gasisolierten
assignées supérieures à 52 kV metallgekapselten Schaltanlagen für
(CEI 62271-211:2014) Bemessungsspannungen über 52 kV
(IEC 62271-211:2014)
This European Standard was approved by CENELEC on 2014-05-29. 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, 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: Avenue Marnix 17, B-1000 Brussels
© 2014 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
 Ref. No. EN 62271-211:2014 E

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SIST EN 62271-211:2014
EN 62271-211:2014 - 2 -

Foreword
The text of document 17C/596/FDIS, future edition 2 of IEC 62271-211, 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 approved by CENELEC as EN 62271-211:2014.
The following dates are fixed:
• latest date by which the document has (dop) 2015-02-28
to be implemented at national level by
publication of an identical national
standard or by endorsement
(dow) 2017-05-29
• latest date by which the national
standards conflicting with the
document have to be withdrawn

Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such patent
rights.

Endorsement notice
The text of the International Standard IEC 62271-211:2014 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 62271-209:2007 NOTE Harmonised in EN 62271-209:2007 (not modified).

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SIST EN 62271-211:2014
- 3 - EN 62271-211:2014

Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.

NOTE 1 When 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 60076 series Power transformers -- EN 60076 series
Part 1: General
IEC 60137 2008 Insulated bushings for alternating voltages EN 60137 2008
above 1 000 V
IEC 61936-1 - Power installations exceeding 1 kV a.c. -- EN 61936-1 -
Part 1: Common rules
IEC 62271-1 2007 High-voltage switchgear and controlgear -- EN 62271-1 2008
Part 1: Common specifications
IEC 62271-203 2011 High-voltage switchgear and controlgear -- EN 62271-203 2012
Part 203: Gas-insulated metal-enclosed
switchgear for rated voltages above 52 kV
IEC 62271-207 - High-voltage switchgear and controlgear -- EN 62271-207 -
Part 207: Seismic qualification for gas-
insulated switchgear assemblies for rated
voltages above 52 kV

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SIST EN 62271-211:2014
EN 62271-211:2014 - 4 -
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 CENELEC member.
This European Standard does not fall under any Directive.
In the relevant CEN/CENELEC countries these A-deviations are valid instead of the provisions of the
European Standard until they have been removed.

Clause Deviation
5 Italy (Ministerial Decree of December 1, 1980 and September 10, 1981, published in the
Gazzetta Ufficiale No. 285, 1981-10-16).
Gas-filled compartments having a design pressure exceeding 0,5 bar (gauge) or a volume
exceeding 2000 litres shall be designed to the Italian pressure vessel code for electrical
switchgear.

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SIST EN 62271-211:2014



IEC 62271-211

®


Edition 1.0 2014-04




INTERNATIONAL



STANDARD




NORME



INTERNATIONALE











High-voltage switchgear and controlgear –

Part 211: Direct connection between power transformers and gas-insulated

metal-enclosed switchgear for rated voltages above 52 kV




Appareillage à haute tension –

Partie 211: Raccordements directs entre transformateurs de puissance et


appareillage sous enveloppe métallique à isolation gazeuse de tensions

assignées supérieures à 52 kV












INTERNATIONAL

ELECTROTECHNICAL

COMMISSION


COMMISSION

ELECTROTECHNIQUE

PRICE CODE
INTERNATIONALE

CODE PRIX S


ICS 29.130.10 ISBN 978-2-8322-1534-0



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

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SIST EN 62271-211:2014
– 2 – IEC 62271-211:2014 © IEC 2014
CONTENTS

FOREWORD . 4
1 General . 6
1.1 Scope . 6
1.2 Normative references . 6
2 Normal and special service conditions . 7
2.1 Normal service conditions . 7
2.2 Special service conditions . 7
3 Terms and definitions . 7
4 Rating. 8
4.1 Rated voltage (U ) . 8
r
4.2 Rated insulation level . 8
4.3 Rated frequency (f ) . 9
r
4.4 Rated continuous current (I ) and temperature rise . 9
r
4.5 Rated short-time withstand current (I ) and rated thermal short-time
k
current (I ) . 9
th
4.6 Rated peak withstand current (I ) and rated dynamic current (I ) . 9
p d
4.7 Rated duration of short-circuit (t ) and rated duration (t ) . 9
k th
4.8 Rated filling pressure p of gas for insulation . 9
re
5 Design and construction . 10
5.1 Limits of supply . 10
5.2 Pressure withstand requirements . 11
5.3 Gas and vacuum tightness . 11
5.4 Mechanical forces applied on the connection interface . 12
5.5 Mechanical forces applied on the bushing flange . 12
5.6 Horizontal and vertical displacement . 13
5.7 Vibrations . 13
6 Type tests . 14
6.1 General . 14
6.2 Dielectric tests . 14
6.2.1 Dielectric tests of bushing . 14
6.2.2 Dielectric tests of transformer connection in a single phase
enclosure . 14
6.2.3 Dielectric tests of transformer connection in a three phase
enclosure . 14
6.3 Cantilever load withstand tests. 14
6.4 Gas tightness tests . 15
7 Routine tests . 15
7.1 General . 15
7.2 External pressure test of the bushing . 15
7.3 Tightness tests . 15
8 Standard dimensions and tolerances . 15
8.1 Single-phase direct connection between oil-filled transformer and
switchgear . 15
8.2 Three-phase direct connection between oil-filled transformer and

switchgear . 15
8.3 Connection between gas-insulated transformer and switchgear . 16

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SIST EN 62271-211:2014
IEC 62271-211:2014 © IEC 2014 – 3 –
8.4 Transformer tolerances . 16
8.5 Mounting of the transformer on its foundation . 16
9 Information to be given with enquiries, tenders and orders . 16
10 Transport, storage, erection, operation and maintenance . 16
Bibliography . 21

Figure 1 – Typical direct connection between power transformer and gas-insulated
metal-enclosed switchgear . 17
Figure 2 – Standard dimensions for typical direct connection between power
transformer and gas-insulated metal-enclosed switchgear . 18
Figure 3 – Transformer tolerances for a typical direct connection shown on the
example of a three-phase power transformer connected to a single-phase gas-
insulated metal-enclosed switchgear . 19
Figure 4 – Transformer tolerances for a typical direct connection shown on the
example of a three-phase power transformer connected to a three-phase gas-insulated
metal-enclosed switchgear up to 170 kV . 20

Table 1 – Moment and forces applied on the bushing flange and transformer . 13

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SIST EN 62271-211:2014
– 4 – IEC 62271-211:2014 © IEC 2014
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

HIGH-VOLTAGE SWITCHGEAR AND CONTROLGEAR –

Part 211: Direct connection between power transformers and 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 itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
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 62271-211 has been prepared by subcommittee 17C: High-voltage
switchgear and controlgear assemblies, of IEC technical committee 17: Switchgear and
controlgear.
This first edition cancels and replaces the first edition of IEC/TR 61639:1996 and constitutes
a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) transfer from technical report to international standard;
b) the minimum voltage rating was changed from 72,5 kV to above 52 kV;
c) update of normative references;
d) definition of insulated junction including limit of supply;

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SIST EN 62271-211:2014
IEC 62271-211:2014 © IEC 2014 – 5 –
e) definition of dielectric test of gas-insulated metal-enclosed switchgear for transformer
connection in a three phase enclosure;
f) addition of interface tolerances at transformer side;
g) addition of transformer tolerances in service;
h) addition of exceptional loads for bushings and flanges;
i) consideration of oil- and gas-insulated transformers;
j) inclusion of three-phase enclosed direct connections.
The text of this standard is based on the following documents:
FDIS Report on voting
17C/596/FDIS 17C/600/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.
A list of all parts in the IEC 62271 series, published under the general title High-voltage
switchgear and controlgear, can be found on the IEC website.
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.

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SIST EN 62271-211:2014
– 6 – IEC 62271-211:2014 © IEC 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



1 General
1.1 Scope
This part of IEC 62271 is applicable to single and three phase direct connections between
gas-insulated metal-enclosed switchgear (GIS) for rated voltages above 52 kV and
transformer arrangements to establish electrical and mechanical interchange ability and to
determine the limits of supply of for the transformer connection.
Direct connections are immersed on one end in the transformer oil or insulating gas and on
the other end in the insulating gas of the switchgear.
Transformer arrangements are single-phase transformers with single-phase enclosed
arrangement, three-phase transformers with three single-phase enclosed arrangements or
three-phase transformers with a three-phase enclosed arrangement with three transformer
bushings.
The connection satisfies the requirements of IEC 62271-203 for gas-insulated metal-enclosed
switchgear, IEC 60076 for power transformer and IEC 60137 for completely immersed
bushings.
For the purpose of this international standard the term "switchgear" is used for "gas-insulated
metal-enclosed switchgear".
1.2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and
are indispensable for its application. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC 60076 (all parts), Power transformers
IEC 60137:2008, Insulated bushings for alternating voltages above 1 000 V
IEC 61936-1, Power installations exceeding 1 kV a.c. – Part 1: Common rules
IEC 62271-1:2007, High-voltage switchgear and controlgear – Part 1: Common specifications
IEC 62271-203:2011, High-voltage switchgear and controlgear – Part 203: Gas-insulated
metal-enclosed switchgear for rated voltages above 52 kV
IEC 62271-207, High-voltage switchgear and controlgear – Part 207: Seismic qualification for
gas-insulated switchgear assemblies for rated voltages above 52 kV

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SIST EN 62271-211:2014
IEC 62271-211:2014 © IEC 2014 – 7 –
2 Normal and special service conditions
2.1 Normal service conditions
Subclauses 2.1 of IEC 62271-1:2007 and IEC 62271-203:2011 are applicable.
2.2 Special service conditions
Subclauses 2.2 of IEC 62271-1:2007 and IEC 62271-203:2011 are applicable.
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 62271-1, as well as
the following apply.
3.1
bushing
device that enables a conductor to pass through a transformer tank, and insulates the
conductor from it
Note 1 to entry: The means of attachment (flange or fixing device) to the tank forms part of the bushing.
[SOURCE: IEC 60050-471:2007, 471-02-01, modified – update of the definition]
3.2
completely immersed bushing
a bushing both ends of which are intended to be immersed in an insulating medium other than
ambient air (e.g. oil or gas)
[SOURCE: IEC 60050-471:2007, 471-02-04]
3.3
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
[SOURCE: 3.103 of IEC 62271-203:2011]
3.4
main circuit end terminal
part of the main circuit of a gas-insulated metal enclosed switchgear forming part of the
connection interface
[SOURCE: 3.2 of IEC 62271-209:2007]
3.5
transformer connection enclosure
part of the gas-insulated metal-enclosed switchgear which houses one end of a completely
immersed bushing fitted on a power transformer and a main circuit end terminal
3.6
maximum operating gas pressure
maximum pressure of the gaseous insulating medium in which one end of the bushing is
immersed, when in operation, the switchgear-power transformer connection assembly carrying
its rated normal current at the maximum ambient air temperature

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SIST EN 62271-211:2014
– 8 – IEC 62271-211:2014 © IEC 2014
3.7
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 operating gas pressure in the enclosure at the highest
temperature that the gas used for insulation can reach under specified maximum service conditions
[SOURCE: 3.113 of IEC 62271-203:2011, modified – update of the note to entry]
3.8
rated filling pressure p of gas for insulation
re
pressure (in Pa), for insulation, referred to the standard atmospheric air conditions of +20 °C
and 101,3 kPa, which may be expressed in relative or absolute terms, to which the assembly
is filled before being put into service
[SOURCE: 3.6.5.1 of IEC 62271-1:2007, modified – update of the term and the definition]
3.9
minimum functional pressure p for insulation
me
pressure (in Pa), for insulation, referred to the standard atmospheric air conditions of +20 °C
and 101,3 kPa, which may be expressed in relative or absolute terms at which and above
which the characteristics of the switchgear-power-transformer connection are maintained and
at which replenishment becomes necessary
[SOURCE: 3.6.5.5 of IEC 62271-1:2007, modified – update of the term and the definition]
3.10
insulated junction
all parts which are needed to insulate the transformer from the switchgear including but not
limited to the insulating flange
3.11
proctor density
moisture-density relationship of a soil for a given compactive effort depending on the amount
of water the soil contains during soil compaction of controlled magnitude
4 Rating
4.1 Rated voltage (U )
r
The rated voltage shall be the rated voltage of the switchgear, selected from the following
standard values:
72,5 kV – 100 kV – 123 kV – 145 kV – 170 kV – 245 kV – 300 kV – 362 kV – 420 kV – 550 kV
NOTE Values 800 kV and higher are not considered because there is little experience at this time.
4.2 Rated insulation level
The rated insulation level for the GIS part in the transformer connection enclosure shall be
selected from the values given in the product standard IEC 62271-203. The rated insulation
level for the transformer bushing shall be selected from the values given in the product
standard IEC 60137.
NOTE Transformers can be tested at other insulation level values, according to the relevant standard.
The rated insulation level for a direct connection has to fulfil at least the requirements of
IEC 62271-203.

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SIST EN 62271-211:2014
IEC 62271-211:2014 © IEC 2014 – 9 –
4.3 Rated frequency (f )
r
Subclause 4.3 of IEC 62271-1:2007 applies.
4.4 Rated continuous current (I ) and temperature rise
r
The dimensions of the connection interfaces shown in Figure 2 allow a maximum value of
3 150 A for the rated continuous current. The connection interface is shown in Figure 1 as
parts 3 and 4.
The contact surfaces of the connection interface shall be silver-coated, copper-coated or bare
copper.
For the rated continuous current, the connection between switchgear and power transformer
shall be designed that the temperature of the transformer connection enclosure and the
temperature of the connection interface do not exceed the values given in 4.4.2 of
IEC 62271-203:2011.
4.5 Rated short-time withstand current (I ) and rated thermal short-time current (I )
th
k
For the rated short-time withstand current of the GIS part of the transformer connection 4.5 of
IEC 62271-1:2007 is applicable and for the rated thermal short-time current of the bushing 4.3
of IEC 60137:2008.
It is recommended to apply the same short-time currents for GIS and bushing.
4.6 Rated peak withstand current (I ) and rated dynamic current (I )
p d
For the rated peak withstand current of the GIS part of the transformer connection 4.6 of
IEC 62271-1:2007 is applicable and for the rated dynamic current of the bushing 4.4 of
IEC 60137:2008.
It is recommended to apply the same value for the rated peak withstand current for the GIS
and the rated dynamic current for the bushing.
4.7 Rated duration of short-circuit (t ) and rated duration (t )
k th
For the rated duration of the short-circuit current of the GIS part of the transformer connection
4.7 of IEC 62271-1:2007 is applicable and for the rated duration of the bushing 4.3 of
IEC 60137:2008.
It is recommended to apply the same value for the rated duration of short circuit for the GIS
and the rated duration for the bushing.
4.8 Rated filling pressure p of gas for insulation
re
The rated filling pressure p (or density) of gas for insulating is assigned by the switchgear
re
manufacturer.
If SF is used as the insulating gas,
...