Circuit breaker

Details Circuit breaker Circuit breaker

1989-02-23

1989-10-10

Deboer, Todd E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361 92, 361 94, 340662, 324424, H02H 3093

Patent

active

048736031

ABSTRACT:
Output current of secondary winding of a current transformer (21) corresponding to current value of an A.C. power line (1) is led to series connection of an electric power circuit (500) and resistors (40,41); voltages obtained across the resistors (40,41) are input to a time delay circuit (70) which ignites a load break contact (200) in the A.C. power line (1) when an accident overcurrent flows in compliance with tripping characteristics. A quasi output signal or reference signal for testing of D.C. voltage is applied to the time delay circuit (70) when any current does not flow in the A.C. power line, thereby to enable tripping test of the circuit breaker as it is connected to the actual power line.

REFERENCES:
patent: 3924160 (1975-12-01), Maier et al.
patent: 4414601 (1983-11-01), Conroy, Jr.
patent: 4694374 (1987-09-01), Verbanets, Jr.
patent: 4710845 (1987-12-01), Demeyer

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