Electrical bushing

Details Electrical bushing Electrical bushing

1977-10-27

1978-10-24

Askin, Laramie E.

Electricity: conductors and insulators

With fluids or vacuum

With fluid-condition responsive and/or indicating means

174 18, 174 31R, 340626, 340646, 361332, H01B 1726, H02H 508, H01F 2700

Patent

active

041222970

ABSTRACT:
A fluid-filled electrical bushing for connecting an electrical conductor in a fluid-filled transformer to an electrical conductor in another enclosure. The electrical bushing includes a safety device consisting of two coaxial flexible capsules which are joined to a plate disposed therebetween and which respectively communicate with the dielectric fluid in the bushing and with the dielectric fluid in the transformer. The plate, which is movable in opposite axial directions in response to the pressure difference between the dielectric fluid in the bushing and the dielectric fluid in the transformer acting thereon, alternately engages first or second electrical contacts to complete an electrical circuit indicating an over-pressure condition caused by internal arcing, or the abnormal expansion or an insufficient amount of dielectric fluid within the bushing.

REFERENCES:
patent: 2092560 (1937-09-01), Runaldue
patent: 2151092 (1939-03-01), Dunsheath
patent: 2556906 (1951-06-01), Del Mar
patent: 3746935 (1973-07-01), Wagenaar et al.
patent: 4054351 (1977-10-01), Gallay et al.

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