Device for preventing an electrical equipment from re-powering a

Details Device for preventing an electrical equipment from re-powering a Device for preventing an electrical equipment from re-powering a

1996-04-26

1998-03-03

Shoop, Jr., William M.

Electrical transmission or interconnection systems

Switching systems

Condition responsive

307130, 307139, H01H 4700

Patent

active

057239142

ABSTRACT:
Re-powering an electrical equipment after recovery of service interruption is prevented if the power switch of the electrical equipment stays in ON position. During a transit period of time just after recovery of service interruption, the detection voltage from a post-voltage detection circuit is set to exceed the detection voltage from a pre-voltage detection circuit. In this condition, a photo triac connected in series to the power switch is rendered non-conductive so that the electrical equipment will not be energized.

REFERENCES:
patent: 4415943 (1983-11-01), Wortman
patent: 5424894 (1995-06-01), Briscall et al.

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