G - Physics – 01 – R
Patent
G - Physics
01
R
324/58.03
G01R 31/08 (2006.01)
Patent
CA 1183212
FAULT INDICATOR WITH BIDIRECTIONAL INDICATOR WINDING Edmund O. Schweitzer, Jr. Abstract of the Disclosure A fault indicator for indicating the occurrence of a fault current in a power distribution system includes a test-point-mounted circuit module and a remotely-mounted indi- cator module. The indicator module incorporates a bidirectional magnetic winding and a magnetic indicating element having a magnetic state conditioned by energization of the winding. Upon the occurrence of a fault in the power system trip cir- cuitry within the circuit module energizes the winding with current in one direction to condition the indicator element to a fault-indicating magnetic state. Upon restoration of current in the system, reset circuitry within the circuit module energizes the winding with current in the opposite direction to condition the indicator to a reset-indicating magnetic state. The use of currents of opposite direction in a single magnetic winding provides greater flux density at the indicating element, and enables the indicator module to be connected to the circuit module by means of a two conductor cable. Alternate embodiments of the invention, utilizing visual-type indicator modules and current-reset modules, are also shown.
408950
Osler Hoskin & Harcourt Llp
Schweitzer Edmund O. Jr.
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