IEC 62271-211:2024
(Main)High-voltage switchgear and controlgear - Part 211: Direct connection between power transformers and gas-insulated metal-enclosed switchgear for rated voltages above 52 kV
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 62271-211:2024 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 for the transformer connection. This second edition cancels and replaces the first edition of IEC 62271-211:2014. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
a) re-numbering of clauses according to IEC 62271-1:2017,
b) Clause 3: updating definition about bushing (3.1), updating some pressure definitions (3.6, 3.7, 3.8, 3.9), rewording definition about proctor density (3.11), new term very-fast-front overvoltage (3.12),
c) Clause 5 (former clause 4): add a subclause 5.1 General, according to IEC 62271-1:2017 and IEC 62271-203:2022,
1) subclause 5.5: new first paragraph, rewording second paragraph,
2) subclause 5.8: modify the term "Rated duration of thermal short-time current" of the bushing,
d) Clause 6 (former Clause 5): restructure and rewording of subclauses:
1) 6.1 (former 5.3): requirements about gas and vacuum tightness of the transformer bushing
2) 6.3 (former 5.2): harmonization with IEC 62271-203:2022 about typical maximum pressure in service for SF6, other gases and gas mixtures,
3) 6.4 (former 5.8), rewording
4) 6.5 (former 5.1), some rewording and modification
5) 6.6 (former 5.4), some rewording, updated references
6) 6.7 (former 5.5), some rewording
7) 6.8 (former 5.6), some rewording
8) 6.9 (former 5.7), slight rewording,
e) Clause 7 (former clause 6) type tests: some rewording and clarifications about references,
f) Clause 8 (former clause 7) routine tests:
1) 8.2 (former 7.2): add a paragraph about SF6-mixtures and other gases than SF6,
2) 8.3 (former 7.3): update reference to relevant on-site test according to IEC 62271‑203:2022,
g) Clause 9 Guide to the selection of switchgear and controlgear (new): informative, to have a reference to IEC 62271-203:2022,
h) Clause 11 (former 10): updated headline and updated reference according to IEC 62271‑1:2017,
i) new Clauses 12 Safety and 13 Environmental aspects: Adding of references to safety and environmental aspects,
j) correction of errors in Corrigendum 2 of IEC 62271-211:2017,
k) modified orientation of Figure 1 to Figure 4 for easier reading of the tables.
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 62271-211:2024 s'applique 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 seconde édition annule et remplace la première édition de l'IEC 62271-211:2014. Cette édition constitue une révision technique.
Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
a) renumérotation des articles selon l'IEC 62271-1:2017;
b) Article 3: mise à jour de la définition de la traversée (3.1), mise à jour de certaines définitions relatives à la pression (3.6, 3.7, 3.8, 3.9), reformulation de la définition de la densité proctor (3.11), nouveau terme surtension à front très rapide (3.12);
c) Article 5 (ancien Article 4): ajout d'un 5.1 Généralités, conformément à l'IEC 62271-1:2017 et l'IEC 62271-203:2022;
1) 5.5: nouveau premier alinéa, reformulation du deuxième alinéa;
2) 5.8: modification du terme "durée assignée du courant de courte durée thermique" de la traversée;
d) Article 6 (ancien Article 7): restructuration et reformulation des paragraphes:
1) 6.1 (ancien 5.3): exigences concernant l'étanchéité du gaz et du vide de la traversée du transformateur;
2) 6.3 (ancien 5.2): harmonisation avec l'IEC 62271-203:2022 en ce qui concerne la pression maximale type en service pour le SF6, d'autres gaz et les mélanges de gaz;
3) 6.4 (ancien 5.8): reformulation;
4) 6.5 (ancien 5.1): reformulation partielle et modification;
5) 6.6 (ancien 5.4): reformulation partielle, mise à jour de références;
6) 6.7 (ancien 5.5): reformulation partielle;
7) 6.8 (ancien 5.6): reformulation partielle;
8) 6.9 (ancien 5.7): légère reformulation;
e) Article 7 (ancien Article 6), essais de type: reformulation partielle et clarifications des références;
f) Article 8 (ancien Article 7), essais individuels de série:
1) 8.2 (ancien 7.2): ajout d'un alinéa concernant les mélanges de SF6 et d'autres gaz que le SF6;
2) 8.3 (ancien 7.3): mise à jour de la référence pour l'essai sur site applicable selon l'IEC 62271‑203:2022;
g) Article 9 Guide pour le choix de l'appareillage (nouveau): informatif, à des fins de référence à l'IEC 62271-203:2022;
h) Article 11 (ancien Article 10): mise à jour du titre et mise à jour de la référence conformément à l'IEC 62271‑1:2017;
i) nouveaux Articles 12 Sécurité et 13 Aspects liés à l'environnement: ajout de références à la sécurité et aux aspects liés à l'environnement;
j) correction d'erreurs dans le Corrigendum 2 de l'IEC 62271-211:2017;
k) modification de l'orientation des Figures 1 à 4 afin de faciliter la lecture des tableaux.
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IEC 62271-211 ®
Edition 2.0 2024-09
INTERNATIONAL
STANDARD
High-voltage switchgear and controlgear –
Part 211: Direct connection between power transformers and gas-insulated
metal-enclosed switchgear for rated voltages above 52 kV
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IEC 62271-211 ®
Edition 2.0 2024-09
INTERNATIONAL
STANDARD
High-voltage switchgear and controlgear –
Part 211: Direct connection between power transformers and gas-insulated
metal-enclosed switchgear for rated voltages above 52 kV
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.130.10 ISBN 978-2-8322-9578-6
– 2 – IEC 62271-211:2024 © IEC 2024
CONTENTS
FOREWORD . 4
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 8
4 Normal and special service conditions . 10
4.1 Normal service conditions . 10
4.2 Special service conditions . 10
5 Ratings . 10
5.1 General . 10
5.2 Rated voltage (U ) . 10
r
5.3 Rated insulation level (U , U , U ) . 10
d p s
5.4 Rated frequency (f ) . 10
r
5.5 Rated continuous current (I ) . 11
r
5.6 Rated short-time withstand current (I ) and rated thermal short-time
k
current (I ) . 11
th
5.7 Rated peak withstand current (I ) and rated dynamic current (I ) . 11
p d
5.8 Rated duration of short-circuit (t ) and of thermal short-time current (t ) . 11
k th
6 Design and construction . 11
6.1 Gas and vacuum tightness . 11
6.2 Gas pressure for insulation of the bushing inside the gas-insulated
switchgear (GIS) enclosure . 12
6.3 Pressure withstands requirements . 12
6.4 Standard dimensions and tolerances. 12
6.4.1 General . 12
6.4.2 Single-phase direct connection between oil-filled transformer and
switchgear . 13
6.4.3 Three-phase direct connection between oil-filled transformer and
switchgear . 13
6.4.4 Connection between gas-insulated transformer and switchgear . 13
6.4.5 Transformer tolerances . 13
6.4.6 Mounting of the transformer on its foundation . 13
6.5 Limits of supply . 13
6.6 Mechanical forces applied on the connection interface . 15
6.7 Mechanical forces applied on the bushing flange . 15
6.8 Horizontal and vertical displacement . 17
6.9 Vibrations . 17
7 Type tests . 17
7.1 General . 17
7.2 Dielectric tests . 17
7.2.1 Dielectric tests of bushing . 17
7.2.2 Dielectric tests of transformer connection in a single-phase enclosure . 18
7.2.3 Dielectric tests of transformer connection in a three-phase enclosure . 18
7.3 Cantilever loads withstand tests . 18
7.4 Gas tightness tests . 18
8 Routine tests . 18
8.1 General . 18
8.2 External pressure test of the bushing . 18
8.3 Tightness tests . 19
9 Guide to the selection of switchgear and controlgear (informative) . 19
10 Information to be given with enquiries, tenders and orders (informative) . 19
11 Transport, storage, installation, operating instructions and maintenance. 19
12 Safety . 19
13 Environmental aspects . 20
Bibliography . 25
Figure 1 – Typical direct connection between power transformer and gas-insulated
metal-enclosed switchgear . 21
Figure 2 – Standard dimensions for typical direct connection between power
transformer and gas-insulated metal-enclosed switchgear . 22
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 . 23
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 . 24
Table 1 – Moments and forces applied on the bushing flange and transformer . 16
– 4 – IEC 62271-211:2024 © IEC 2024
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
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