Portable calibrator for d.c. circuit breakers

Details Portable calibrator for d.c. circuit breakers Portable calibrator for d.c. circuit breakers

1978-06-27

1980-06-24

Tokar, Michael J.

Electricity: measuring and testing

Electromechanical switching device

Circuit breaker

324415, G01R 3102

Patent

active

042097398

ABSTRACT:
A portable calibrator for d.c. circuit breakers is provided which produces a low voltage, short duration current test pulse of a current level sufficient to trip the breaker under test. The current pulse is produced by a high power, high frequency d.c. to d.c. converter which is controlled by lower power signals. A static switch controlled by the converter output provides current protection for the converter. A feedback loop including a current transformer connected in an output transformer circuit provides control of the test pulse. A non-inductive shunt connected in a negative test lead monitors the test pulse during the period of application thereof, the shunt being connected to a sample and hold read-out circuit which includes metering for indicating the peak current value. A timer interlocked with the metering ensures that sufficient time is provided for the operator to read current value.

REFERENCES:
patent: 3259839 (1966-07-01), Coleman et al.
patent: 3532967 (1970-10-01), Milton et al.
patent: 3678372 (1972-07-01), Elder
patent: 4128804 (1978-12-01), Russell

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