This technical report 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 atmos-pheric pressure, for alternating current of rated voltages of 72,5 kV and above, and for service frequencies up to and including 60 Hz.
It is intended that this technical report be used in situations where the provisions of IEC 60517 are not adequate, for example:
- 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 or equal to 500 m).
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, cable boxes, metal-enclosed surge arresters 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.
This technical report should be read in conjunction with IEC 60694.
NOTE 1 - In this technical report, the term "HV gas-insulated transmission line" is abbreviated to "GIL".
NOTE 2 - In this technical report, the word "gas" means gas or gas mixture, as defined by the manufacturer.
IEC TR2 61640:1998 history
1998IEC TR2 61640:1998 Rigid high-voltage, gas-insulated transmission lines for rated voltage of 72,5 kV and above
IEC TR2 61640:1998 Rigid high-voltage, gas-insulated transmission lines for rated voltage of 72,5 kV and above was changed to IEC 62271-204:2011 High-voltage switchgear and controlgear - Part 204: Rigid gas-insulated transmission lines for rated voltage above 52 kV.