G - Physics – 01 – R
Patent
G - Physics
01
R
G01R 31/08 (2006.01) G01R 13/40 (2006.01) G01R 31/02 (2006.01) G01R 31/42 (2006.01)
Patent
CA 2100651
A fault indicator for indicating at a remote location the occurrence of a fault current in a monitored electrical conductor of an AC power distribution system utilizes a liquid crystal display having independent "F" and "N" optical display and optical shutter electrodes. A rectifier circuit capacitively coupled to the conductor charges a first capacitor in the presence of voltage on the conductor. A second capacitor us connected to the first capacitor by a first reed switch in magnetic communication with the conductor. Upon occurrence of a fault current the reed switch closes and a portion of the charge on the first capacitor is transferred to the second capacitor, which is connected to the "F" display actuator electrodes of the liquid crystal display to cause an "F" to be displayed and an associated optical shutter to open. The fault indication can be reset either by the slow discharge of the second capacitor, or by discharging the second capacitor through a second reed switch manually actuated by a magnetic reset tool from outside the fault indicator housing. The "N" display actuator electrodes are capacitively coupled to the monitored conductor and system ground to cause an "N" to be displayed and an associated optical shutter electrode 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 shutter electrodes 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 photodetector provides a second output signal indicative of the presence of voltage on the conductor.
Osler Hoskin & Harcourt Llp
Schweitzer Edmund O. Jr.
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