UNE-EN IEC 62271-204:2022

This part of IEC 62271 applies to rigid HV gas-insulated transmission lines (GIL) in which the

insulation is obtained, at least partly, by a non-corrosive insulating gas, other than air at atmospheric

pressure, for alternating current of rated voltages above 52 kV, and for service

frequencies up to and including 60 Hz.

It is intended that this international standard shall be used where the provisions of IEC 62271-

203 do not cover the application of GIL (see Note 3).

At each end of the HV gas-insulated transmission line, a specific element may be used for the

connection between the HV gas-insulated transmission line and other equipment like bushings,

power transformers or reactors, cable boxes, metal-enclosed surge arresters, voltage

transformers or GIS, covered by their own specification.

Unless otherwise specified, the HV gas-insulated transmission line is designed to be used under

normal service conditions.

Note 1 to entry: In this international standard, the term "HV gas-insulated transmission line" is abbreviated to "GIL".

Note 2 to entry: In this international standard, the word "gas" means gas or gas mixture, as defined by the

manufacturer.

Note 3 to entry: Examples of GIL applications are given:

where all or part of the HV gas-insulated transmission line is directly buried; or

where the HV gas-insulated transmission line is located, wholly or partly, in an area accessible to public; or

where the HV gas-insulated transmission line is long (typically longer than to 500 m) and the typical gas

compartment length exceeds the common practice of GIS technology.