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Dielectric breakdown of supercritical helium

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2 Author(s)
I. Ishii ; Electrotechnical Laboratory of Japan, Tanashi Branch, Tanashi, Japan ; T. Noguchi

The paper reports the results of an experimental investigation into the dielectric-breakdown behaviour of super-critical helium, in the range from 4.2 to 30 K and 0.4 to 1.5 MPa under d.c., a.c. and standard impulse voltages, to assist the development of superconducting power cables. At helium densities above 80 kg m¿3, the uniform-field breakdown voltage for d.c. or a.c. is about 55 MV m¿1 at 0.8 MPa and has a slight pressure dependence. In nonuniform fields, the breakdown voltage with a negative electrode is considerably increased by corona stabilisation in the density range from 30 to 83 kg m¿3.

Published in:

Electrical Engineers, Proceedings of the Institution of  (Volume:126 ,  Issue: 6 )