Device for generating an AC ramp for checking the tripping curre

Details Device for generating an AC ramp for checking the tripping curre Device for generating an AC ramp for checking the tripping curre

1984-01-30

1986-09-09

Levy, Stewart J.

Electricity: measuring and testing

Electromechanical switching device

Circuit breaker

361 86, G01R 3132

Patent

active

046111743

ABSTRACT:
A device is provided for generating an AC current ramp for checking the tripping current of the circuit-breaker, in which the current is regulated by a power transistor driven by the voltage available at the middle point of a potentiometric divider, this latter comprising a field effect transistor which is itself driven by a voltage depending on the voltage at the terminals of a capacitor charged by an auxiliary battery. It further comprises a constant current generator which is fed with current by the auxiliary battery for charging said capacitor and a comparator amplifier a first input of which is connected to said capacitor, a second input of which is connected to the junction point between a measuring resistor and said power transistor and the output of which is connected to the gate of said field effect transistor.

REFERENCES:
patent: 3745373 (1973-07-01), Jones et al.

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