Combination fuse and bushing

Details Combination fuse and bushing Combination fuse and bushing

1972-07-26

1976-06-08

Envall, Jr., R. N.

Electricity: electrothermally or thermally actuated switches

Electrothermally actuated switches

Fusible element actuated

174142, H01H 8502

Patent

active

039626679

ABSTRACT:
A fused high voltage electrical bushing adapted to be mounted at the entrance in a casing to an electrical apparatus to provide a connection between a high voltage cable and the electrical apparatus, the bushing including a housing formed of a dielectric material and having an axially extending passage, an electrical terminal sealed to each end of said passage, a fusible element within said passage, interconnecting the terminals, and a granular dielectric material completely filling the passage; a layer of electrically conductive material is provided on the inner surface of said passage and extends through the entrance in the casing to the electrical apparatus, the inner layer of material being spaced from and electrically connected to the element, and a layer of electrically conductive material on the outer surface of said housing for forming a stress cone at the entrance of the casing to said apparatus, the stress cone being grounded through said casing, the inner and outer layers cooperating to reduce voltage stress at the point of entrance through the casing.

REFERENCES:
patent: 2408990 (1946-10-01), Mitchell
patent: 2732419 (1956-01-01), Wilson
patent: 2790842 (1957-04-01), Nicholas
patent: 2835725 (1958-05-01), Nicholas
patent: 3244838 (1966-04-01), Astleford
patent: 3544707 (1970-12-01), Gamble
patent: 3622688 (1971-11-01), Link et al.
patent: 3633141 (1972-01-01), Ristuccia
patent: 3648211 (1972-03-01), McKeithan
patent: 3684995 (1972-08-01), Horton
patent: 3806625 (1973-03-01), Long

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