Overcurrent and ground fault responsive trip unit for...

Details Overcurrent and ground fault responsive trip unit for... Overcurrent and ground fault responsive trip unit for...

G - Physics

01

R

324/58.4

G01R 31/02 (2006.01)

Patent

CA 1105086

41PR-3071 ABSTRACT OF THE DISCLOSURE A circuit breaker electronic trip unit is equipped with a plurality of current transformers for sensing overcurrent and ground fault conditions in a distribution circuit. A ground fault signal voltage is applied to a differential amplifier together with an adjusted voltage establishing a desired ground fault signal pick-up level. The differential amplifier controls a variable duty cycle switch to establish charging versus discharging rates for a timing capacitor in accordance with ground fault signal amplitude. When the voltage across the capacitor exceeds a predetermined thres- hold, a thyristor is triggered to draw a safe level of energizing current through a trip coil. Secondary open circuited protection is provided for any of the current transformers disposed externally of the circuit breaker.

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