Fault indicator having electrostatically-actuated indicator flag

Details Fault indicator having electrostatically-actuated indicator flag Fault indicator having electrostatically-actuated indicator flag

1988-08-10

1992-10-06

Orsino, Joseph A.

Communications: electrical

Condition responsive indicating system

Specific condition

324133, 324529, 324543, G08B 2100

Patent

active

051535653

ABSTRACT:
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.

REFERENCES:
patent: 405572 (1889-06-01), Loomis
patent: 2610030 (1953-09-01), Gardner
patent: 3406477 (1975-09-01), Schweitzer, Jr.
patent: 3496559 (1970-02-01), Brumfield
patent: 3594767 (1971-07-01), Link
patent: 3866197 (1975-02-01), Schweitzer, Jr.

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