Fault indicator with combined trip and reset winding

Details Fault indicator with combined trip and reset winding Fault indicator with combined trip and reset winding

1981-08-04

1984-03-20

Strecker, Gerard R.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Nonquantitative

324 51, 340664, G01R 1914, G01R 3102

Patent

active

044384033

ABSTRACT:
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 indicator 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 circuitry 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.

REFERENCES:
patent: 3906477 (1975-09-01), Schweitzer, Jr.
patent: 3991366 (1976-11-01), Schweitzer, Jr.
patent: 4034360 (1977-07-01), Schweitzer, Jr.

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