IEC 62271-211:2014

High-voltage switchgear and controlgear - Part 211: Direct connection between power transformers and gas-insulated metal-enclosed switchgear for rated voltages above 52 kV

IEC 62271-211:2014 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. 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;
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 contents of the corrigendum 1 of August 2015 and corrigendum 2 of August 2017 have been included in this copy.

Appareillage à haute tension - Partie 211: Raccordements directs entre transformateurs de puissance et appareillage sous enveloppe métallique à isolation gazeuse de tension assignée supérieure 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. Le contenu du corrigendum 1 d'août 2015 et le corrigendum 2 d'août 2017 a été pris en considération dans cet exemplaire.

General Information

• Status: Published
• Publication Date: 23-Apr-2014
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 29.130.10 - High voltage switchgear and controlgear
• ICS: 33.120.10 - Coaxial cables. Waveguides
• Technical Committee: SC 17C - Assemblies
• Drafting Committee: MT 27 - TC 17/SC 17C/MT 27

Relations

• Replaces: IEC TS 61639:1996 - Direct connection between power transformers and gas-insulated metal-enclosed switchgear for rated voltages of 72,5 kV and above
• Effective Date: 05-Sep-2023
• Corrected By: IEC 62271-211:2014/COR2:2017 - Corrigendum 2 - 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: 05-Sep-2023
• Corrected By: IEC 62271-211:2014/COR1:2015 - Corrigendum 1 - 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: 05-Sep-2023
• Revised: IEC 62271-211:2024 - 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: 05-Sep-2023

Standards Content (Sample)

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
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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

– 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

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

– 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
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