IEC 62271-203:2011

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. 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. 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.

IEC 62271-203:2022 specifies requirements for gas-insulated metal-enclosed switchgear in which the insulation is obtained, at least partly, by an insulating gas or gas mixture 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. This third edition cancels and replaces the second edition published in 2011. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: - the document has been aligned with IEC 62271-1:2017; - beside SF6 also alternative gases have been implemented where needed; - the terms and definitions have been updated and terms not used have been removed; - Subclause 6.16 “Gas and vacuum tightness” has been updated; - Subclause 6.16.3 “Closed pressure systems”: Two classes of gas has been introduced: - GWP ≤ 1 000 - GWP > 1 000 and the tightness requirements for type tests for gasses with GWP > 1 000 has been reduced from 0,5 % to 0,1 % per year per gas compartment; - Subclause 6.108 “Interfaces”: Typical maximum pressures in service for interfaces connected to GIS have been defined; - Subclauses 7.102 through 7.108 have been restructured; - Subclause 7.107 “Corrosion test on earthing connections” has been updated; - Subclause 7.108 “Corrosion tests on sealing systems of enclosures and auxiliary equipment” has been updated; - Annex F ‘Service Continuity’ has been modified and aligned with the recommendations of CIGRE WG B3.51.