IEC 62271-211:2014

Applicable to the single-phase connection assemblies between gas-insulated metal-enclosed switchgear for rated voltages of 72,5 kV and above satisfying the requirements of IEC 60517 and power transformers satisfying the requirements of IEC 60076 and fitted with completely immersed bushings satisfying the requirements of IEC 60137, one end of which is immersed in the transformer oil, and the other end in the insulating gas of the switchgear. Its purpose is to establish electrical and mechanical interchangeability in the interface arrangement of these connection assemblies and to determine the limits of supply.

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.