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

Abstract

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 SF6 for insulation; the literature will probably not provide all information needed. Some measurements are also being made at EDF. Highlights are given here.

Gases for electrical insulation and arc interruption :

“…Pace et al [34] argued that when the area effect is taken into consideration, the recent Electricite de France measurements [96] are compatible with the DC measurements of Ref. [37].…”

“…Existing measurements [3, 6, for cylindrical electrode geometries (similarity plot) for pure nitrogen [34] Data of Pace et al [34], Cooke and Velazquez [95], and Cookson and…”

“…[36,50,94,95] were made on coaxial geometries with various inner and outer conductor diameters. electrodes as a function of gas pressure [34,96].…”

“…•, Lightning data of Elecricite de France [34, Electricite de France as reported by Pace et al [34,96].…”

“…• Pace et al [34,96] compared the AC measurements of Cookson and Pedersen [37] for a 10% mixture. The data [34,96] are in reasonable agreement when the similarity law for cylinders is applied (Fig.…”