Current sensing relay circuit with adjustable sensitivity and tr

Details Current sensing relay circuit with adjustable sensitivity and tr Current sensing relay circuit with adjustable sensitivity and tr

1987-09-24

1989-05-23

Jennings, Derek S.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361 42, 361 45, 361 94, H02H 308

Patent

active

048335649

ABSTRACT:
Ground fault interrupting circuit breaker (10) includes a sensing coil (20) which is the secondary winding of a current transformer having a core (18) and includes a test coil (22) also wound about the core with load conductors passing through the core. A current sensing circuit (30) compares the output from the sensing coil to a reference voltage which is adjustable to set the sensitivity of the breaker. A test circuit (42) generates in the test coil a test current whch has its magnitude determined by the same reference voltage which determines the sensitivity of the breaker, thus causing the test current to automatically track the sensitivity of the breaker without separate adjustment.

REFERENCES:
patent: 4542432 (1985-09-01), Nichols, III et al.
patent: 4568997 (1986-02-01), Bienwald et al.
patent: 4578732 (1986-03-01), Draper et al.
patent: 4618907 (1986-10-01), Leopold

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