Safety discharge circuit for high voltage electrical system and

Details Safety discharge circuit for high voltage electrical system and Safety discharge circuit for high voltage electrical system and

1997-05-27

1998-12-08

Mullen, Jr., Thomas J.

Communications: electrical

Condition responsive indicating system

Specific condition

340649, 361 1, 307140, G08B 2100

Patent

active

058476555

ABSTRACT:
Safety discharge circuit and method, capable of protecting workers from electric shocks during maintenance of high voltage electrical systems. A high voltage electrical system is placed inside a grounded box having a cover, releasably connected to the box. The circuit uses an electronic device adapted to sense the removal of the cover from the box and disable the high voltage electrical system. The electronic device is connected to the cover at its input and to the high voltage electrical system at its output, and is preferably a semiconductor controlled rectifier having a gate at its input. The semiconductor controlled rectifier is in a reverse blocking state when the cover is connected to the box, and is latched in a forward conducting state when the cover is removed from the box. The connection from the gate of the semiconductor controlled rectifier to the cover is made through mounting screws, which hold the high voltage electrical system connected to the cover.

REFERENCES:
patent: 4005253 (1977-01-01), Walter
patent: 4199072 (1980-04-01), Jacks
patent: 4207558 (1980-06-01), Kunzer
patent: 4255691 (1981-03-01), Inagaki et al.
patent: 4774390 (1988-09-01), Lehman et al.
patent: 4829390 (1989-05-01), Simon
patent: 4914854 (1990-04-01), Zhou et al.
patent: 5579192 (1996-11-01), Lee
patent: 5641953 (1997-06-01), Fisher, Jr.

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