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Insulating materials for super-conductors, their characteristics at cryogenic temperature

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3 Author(s)
Husain, E. ; Dept. of Electr. Eng., Aligarh Muslim Univ., India ; Mohsin, M.M. ; Naqvi, S.R.S.

Liquid nitrogen (LN2) and cryogenic nitrogen (CGN2 ) are found suitable not only as coolants but also as insulating materials for high critical temperature superconductors (HTSC). Experimental studies have been carried out to evaluate the dielectric strength of LN2, under varying field conditions. Experiments were also performed with CGN2 and solid insulting materials immersed in LN2 using spherical electrodes. The breakdown strength of insulating materials has been found to increase significantly at cryogenic temperatures in comparison to atmospheric temperatures. The increase in breakdown strength of insulating materials like cotton tape, empire tape, Leatheroid paper, varnished paper, Presspahn, Bakelite sheet and mica is comparatively large with respect to materials like P.V.C., minimax and perspex. No apparent physical change was noticed in case of cotton tape, empire tape, Leatheroid paper, varnished paper, Presspahn, Bakelite sheet and mica, when immersed in LN2 while minimax P.V.C. and perspex sheet got hardened and colour of rest pieces of these materials got faded till they remained immersed in LN2

Published in:

Conduction and Breakdown in Solid Dielectrics, 1998. ICSD '98. Proceedings of the 1998 IEEE 6th International Conference on

Date of Conference:

22-25 Jun 1998