Electricity: conductors and insulators – Insulators – Surface configuration
Patent
1987-11-09
1989-04-04
Askin, Laramie E.
Electricity: conductors and insulators
Insulators
Surface configuration
174 28, 174 99B, H01B 1742, H01B 1718, H02G 506
Patent
active
048188255
ABSTRACT:
An insulating spacer for use in a gas-insulated electric apparatus for supporting a high-tension electric conductor inserted through a metallic pipe enclosing an insulating gas, in which the insulating spacer is provided with a plurality of fins on its creeping surface, and in which fin intervals between the metallic pipe and one of the fins adjacent to the metallic pipe, between adjacent ones of the fins, and between the high-tension electric conductor and one of the fins adjacent to the high-tension electric conductor are formed in a manner so that the fin interval formed at a position where a creeping component electric field is high is made narrower than the fin interval formed at a position where a creeping component electric field is lower than that in the first-mentioned position. Thus, the dielectric strength improvement rate becomes larger at a position where the creeping component electric field is higher so that substantially even creeping dielectric strength can be obtained even when an electrically conductive foreign matter adheres wherever on the outside of the insulating spacer.
REFERENCES:
patent: 1736455 (1929-11-01), Mateer
patent: 3906149 (1975-09-01), Hashoff et al.
patent: 4672150 (1987-06-01), Yamagiwa et al.
Yu, Cun-Yi et al., "The Influence of Change Accumulation on the Impulse Flashover of Spacers in Compressed SF.sub.6 ", paper presented at the Fourth International Symposium of High Voltage Engineering, Athens, Greece, Sep. 5-9, 1983, 4 pages.
Cooke, C. M. et al., "Post-Type Support Spacers for Compressed Gas-Insulated Cables", IEEE Paper T73121-1, presented at the IEEE PES Winter Meeting, New York, N.Y., Jan. 28-Feb. 2, 1973, pp. 1441-1447.
Ishikawa Toshio
Yamagiwa Tokio
Askin Laramie E.
Hitachi , Ltd.
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