Electrical bushing of a gas insulated electrical apparatus

Details Electrical bushing of a gas insulated electrical apparatus Electrical bushing of a gas insulated electrical apparatus

1987-03-11

1988-10-25

Askin, Laramie E.

Electricity: conductors and insulators

Insulators

Combined

174 31R, H01B 1726, H01B 1742

Patent

active

047805773

ABSTRACT:
An electrical bushing of a gas insulated electrical apparatus comprises an insulating tube, a central conductor extending through the insulating tube and a cylindrical shield disposed between the central conductor which is electrically connectable to ground at one end and has an electrical field moderating ring integrally formed therewith at the other end thereof. The central conductor has a reduced diameter portion in the vicinity of the electric field moderating ring of the cylindrical shield and large diameter portions and tapered portions connecting the reduced diameter portion to the large diameter portions. Thus, since the reduced diameter portion is formed in a region where the electric field strength is high, the concentration of the electric field in that region is moderated, thereby resulting in an improvement in the withstand voltage characteristic of the bushing. The reduced diameter portion can be formed as a separate member. Also, the reduced diameter portion may itself have portions of different diameters.

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