Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Using radiant energy
Patent
1992-12-21
1995-05-30
Wieder, Kenneth A.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Using radiant energy
324133, G01R 104
Patent
active
054205026
ABSTRACT:
A fault indicator for indicating at local and remote locations the occurrence of a fault current in a conductor of an AC power distribution system utilizes a liquid crystal display having independent "F" and "N" optical display and shutter elements. Upon occurrence of a fault current a reed switch closes and a portion of the charge on a first capacitor is transferred to a second capacitor, which is connected to the "F" actuator electrodes of the liquid crystal display to cause an "F" to be displayed and an associated optical shutter to open. The "N" actuator electrodes are capacitively coupled to the monitored conductor and system ground to cause an "N" to be displayed and an associated optical shutter to open to indicate that voltage is present on the conductor. First and second light sources are caused to project through respective ones of the optical shutters onto respective first and second photodetectors. A first control circuit responsive to the output of the first photodetector provides a first output signal indicative of the occurrence of a fault. A second control circuit responsive to the second photodectector provides a second output signal indicative of the presence of voltage on the conductor.
REFERENCES:
patent: 5012182 (1993-04-01), Fujiki et al.
patent: 5237233 (1993-08-01), Conley
Bowser Barry C.
Wieder Kenneth A.
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