Faulted circuit detector having isolated indicator
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United States of America Patent
Stats
-
Dec 12, 1995
Issued Date -
N/A
app pub date -
Dec 18, 1992
filing date -
Jun 25, 1990
priority date (Note) -
In Force
status (Latency Note)
Importance
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. The detector includes a temperature compensation circuit and low pass filter circuit so as to prevent misoperation due to varying ambient temperatures or high frequency transients. 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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