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Insulation go-ordination procedure for 420 kV gas insulated lines (GIL)

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1 Author(s)
A. Sabot ; Electr. de France, France

After stating the reasons leading to EDF's interest in 420 kV GIL and the technical and economic imperatives to be considered, the principles adopted for the insulation co-ordination of 420 kV GIL up to a few tens of kilometers long are described. The insulation coordination approach is based on the global failure rate requested for GIL taking into account: the gap in terms of reliability between the actual technology of GIS and the one needed for reliable GIL, the dielectric characteristics of the N2/SF6 mixtures selected, the specific features of GIL with regard to insulation co-ordination (many insulations in parallel, on-site dielectric tests at reduced levels, etc.) compared to substation equipment, the “withstand voltage” guaranteed for the whole GIL by the type tests, and on site tests

Published in:

High Voltage Engineering, 1999. Eleventh International Symposium on (Conf. Publ. No. 467)  (Volume:3 )

Date of Conference:

1999