Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1990-06-25
1992-10-27
Ng, Jin F.
Communications: electrical
Condition responsive indicating system
Specific condition
340664, 324547, 324133, 361 35, 361 93, G08B 2100
Patent
active
051593190
ABSTRACT:
A faulted circuit detector having an electrically isolated and remotely positioned indicator detects fault currents in a monitored conductor. When a fault of a predetermined magnitude is detected, a light pulse is transmitted from the detector to the indicator via a fiber optic cable where, upon receipt, the pulse is converted to an electrical pulse causing the indicator to indicate a "fault" state. A reset circuit within the indicator resets the indicator at regular intervals to the "normal" state as long as a predetermined minimum voltage is present on the monitored conductor. A test circuit is also provided to allow service personnel to field test the device with the monitored conductor in an energized state.
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Banting John F.
Dunk Michael P.
Rector Gary D.
Cooper Industries Inc.
Heim Michael F.
Hofsass Jeffery A.
Maag Gregory L.
Ng Jin F.
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