Possible high pressure nitrogen-based insulation for compressed gas insulated cables

Electricite' de France (EDF) is contemplating 420 kV compressed gas insulated cables (CGIC) as much as tens of kilometers long and environmentally acceptable. An extensive literature review is being made to determine as well as possible how to use nitrogen alone or with minimum SF/sub 6/ for insulation; the literature will probably not provide all information needed. Some measurements are also being made at EDF. Highlights are given here.