Static overcurrent trip device to operate a circuit breaker...

Details Static overcurrent trip device to operate a circuit breaker... Static overcurrent trip device to operate a circuit breaker...

H - Electricity

02

H

348/26

H02H 3/08 (2006.01) H02H 3/093 (2006.01)

Patent

CA 1201522

Abstract.- STATIC OVERCURRENT TRIP DEVICE TO OPERATE A CIRCUIT BREAKER IN RESPONSEOF FAULT CONDITIONS IN AN ALTERNATING CURRENT NET SYSTEM. The analog electronic trip device comprises a time-lag tripping cir- (42) formed by a non-linear function generator likely to elaborate by approximation the tripping characteristic of the circuit breaker. It includes an integrating amplifier (14) comprising a negative-feed- back capacitor C and two inputs in phase opposition. One of the inputs is submitted to two threshold voltages VR1, VR2 determining the mode of long-time delay or short-time delay operation of the trip device. The second threshold voltage VR2 is set by a resistive switch (54) which determined the short delay tripping threshold. Application: circuit breakers for protecting alternating current net system. Refer to fig. 7.

432196

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