Solid state tripping circuit

Details Solid state tripping circuit Solid state tripping circuit

1977-06-17

1979-05-01

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361 98, H02H 308

Patent

active

041527445

ABSTRACT:
The primary winding of a saturable transformer, coupled to an a.c. circuit, drives the core of the transformer into saturation during at least a portion of the cycle of an a.c. current flowing through the circuit. A plurality of rise-time indicator pulses, having a duration inversely proportional to the rate of rise of the a.c. current being monitored, is induced in the secondary winding of the saturable transformer. The rise-time indicator pulses appearing in the secondary winding of the saturable transformer are applied to a pick-up circuit which generates a plurality of rectangular pulses whenever the a.c. current exceeds the normal rated value of the circuit. The pulses generated by the pick-up circuit each have a duty cycle inversely proportional to the rate of rise of the a.c. current being monitored. An inverter circuit, responsive to the pulses generated by the pick-up circuit, generates a second series of rectangular pulses having a duty cycle proportional to the rate of rise of the a.c. current being monitored. The second series of pulses are applied to a tripping circuit which monitors the duty cycles of these pulses and interrupts a.c. current flow in said circuit after a time delay which is inversely proportional to the magnitude of the a.c. current being monitored.

REFERENCES:
patent: 3419757 (1968-12-01), Steen
patent: 3657605 (1972-04-01), Hill
patent: 3666994 (1972-05-01), Watson et al.
patent: 3846675 (1974-11-01), Shimp
patent: 4060844 (1977-11-01), Davis et al.

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