Differential current protection circuit breaker

Details Differential current protection circuit breaker Differential current protection circuit breaker

1987-12-22

1989-08-22

DeBoer, Todd E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

361 45, 361 54, 361110, H02H 326

Patent

active

048601462

ABSTRACT:
A differential current protection circuit breaker that operates as a magnetic amplifier has a secondary winding connected in series to a complex, predominately capacitive measuring impedance and a square wave generator. An evaluating circuit is connected at a tap and is actuated along a tripping device and a switch latch of a switching contact device. The evaluation circuit is blocked by a sensor that responds to extraneous current surges or voltage surges during a predetermined response time. A blocking device in the tripping device responds to the signals from the sensor.

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