Arrester with external isolator

Details Arrester with external isolator Arrester with external isolator

1989-08-16

1990-12-04

Jennings, Derek S.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Transformer protection

361 38, 361 40, 361127, 361131, H02H 704

Patent

active

049757970

ABSTRACT:
An arrester for an under oil transformer is connected between a primary bushing lead and an insulator/isolator penetrating the wall of a housing which encloses the oil, arrester, and transformer parts. A ground wire outside the housing is removably connected to the isolator which functions as a circuit disconnector. The ground wire is removed to open circuit the arrester so that the transformer may be tested without having to disable any parts in the housing. Responsive to an arrester failure, the ground wire is blown away to give a visual indication of the failure. The blowing away of the ground wire eliminates the need for the arrester to fail in an open circuit condition.

REFERENCES:
patent: 3400301 (1968-09-01), Misare
patent: 3666992 (1972-05-01), Goodman
patent: 4320432 (1982-03-01), Duenke
patent: 4604673 (1986-08-01), Schoendube
patent: 4743996 (1988-05-01), Book

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