Circuit breaker

Details Circuit breaker Circuit breaker

1999-01-25

2000-12-19

Leja, Ronald W.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

H02H 300

Patent

active

061634441

ABSTRACT:
A circuit breaker for a power/load circuit including a three-phase AC power supply and a load connected to the power supply by three live power lines. The circuit breaker includes a tripping circuit including switches connected in series with respective power lines facing the power supply, a transformer having at least three balanced primary windings connected in series to respective power lines and a secondary winding, and a voltage comparator connected to the secondary winding for comparing a voltage induced in the transformer with a reference voltage and, in the event of a leakage fault, providing a tripping signal to the tripping circuit to open the switches. A circuit path including a combined voltage sensor/comparator extends across opposite sides and externally of the transformer for sensing and comparing two phase-to-phase voltages with each other and, in the event the voltage comparator detects a voltage imbalance fault simulating a leakage fault condition for the transformer, the voltage comparator provides a tripping signal.

REFERENCES:
patent: 3851216 (1974-11-01), Clarke et al.
patent: 4208688 (1980-06-01), Misencik et al.

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