Bushing for electrical equipment

Details Bushing for electrical equipment Bushing for electrical equipment

H - Electricity

02

G

H02G 3/22 (2006.01)

Patent

CA 2063096

ABSTRACT OF THE DISCLOSURE An insulating bushing according to the present invention comprises an electrical conductor, a primary bushing surrounding the conductor, a protective shield surrounding a portion of the primary bushing, and an insulating elastomeric filler which occupies the interstitial space between the primary bushing and the protective shield. The electrical conductor is a metal rod which extends through an aperture in an electrically conductive surface such as a containment wall for gas-insulated electrical equipment. The primary bushing is a conically tapered casting of an insulating plastic material which extends much of the length of the conductor. The protective shield is a cylindrically- shaped insulating tube which extends outward from the conductive surface to protect the primary bushing from exposure to weather, sunlight, and airborne contaminants. The shield is constructed from a material which is resistant to these hazards, such as glazed porcelain. The insulating elastomeric filler is a resilient, cast-in-place material having a dielectric constant which approximates that of the other insulating materials used in the bushing. The filler eliminates air-filled voids within the bushing and thereby minimizes variation in the dielectric constant among the insulating portions of the bushing. This results in smaller electric field gradients and inhibits electrical breakdown. nro\1376-26.pa3\dt

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