G - Physics – 08 – B
Patent
G - Physics
08
B
324/58.03
G08B 21/00 (2006.01) G01R 15/18 (2006.01)
Patent
CA 1328298
FAULT INDICATOR HAVING ELECTROSTATICALLY-ACTUATED INDICATOR FLAG Edmund O. Schweitzer, Jr. Abstract of the Disclosure A fault indicator for indicating the occurrence of a fault current in a monitored conductor includes an electrostatically-actuated indicator assembly. During normal operation a lightweight indicator flag rotatably mounted in and viewable from the exterior of the indicator housing is held in a reset-indicating position by electrostatic force resulting from an electric field existing between the flag and adjacent electrodes. Upon occurrence of a fault current in the monitored conductor the electric field is removed and the indicator flag, under the influence of a permanent magnet, is caused to rotate to a fault-indicating position. By avoiding the use of magnetic actuator windings and associated pole pieces the indicator assembly is easier and more economical to construct.
608637
Osler Hoskin & Harcourt Llp
Schweitzer Edmund O. Jr.
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