Abstract
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. All the insulation coordination approach is based on the global failure rate requested for GIL taking into account: the gap in term of reliability between the actual technology of GIS and the one needed for reliable GIL, the dielectric characteristics of the N 2 /SF 6 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.
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