Differential current circuit breaker and a method of setting the

Details Differential current circuit breaker and a method of setting the Differential current circuit breaker and a method of setting the

1990-04-23

1993-03-16

Deboer, Todd E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

361 45, 361 93, H02H 326

Patent

active

051950081

ABSTRACT:
A differential current circuit breaker is disclosed in operation with a transductor circuit. The transformer has a secondary winding which is coupled to a measuring resistor in series with a generator, in particular a square wave generator, for alternating magnetization. The circuit breaker includes an evaluation circuit coupled to a tripping mechanism that acts through a breaker mechanism on switching contacts in the conductors being monitored. The evaluation circuit is coupled to a tap between the secondary winding and the measuring impedance. The generator capable of setting the generator frequency within a larger frequency range than is required to compensate for tolerance adjustment in the generator itself.

REFERENCES:
patent: 4860146 (1989-08-01), Pohl et al.
patent: 5075642 (1991-12-01), Learned

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