Single-phase fault detecting circuit breaker

Details Single-phase fault detecting circuit breaker Single-phase fault detecting circuit breaker

H - Electricity

02

H

348/26

H02H 3/16 (2006.01) H02H 3/093 (2006.01) H02H 3/34 (2006.01)

Patent

CA 1148248

14 48,337 A B S T R A C T SINGLE-PHASE FAULT DETECTING CIRCUIT BREAKER Detection apparatus for detecting undesirable single-phase faults and overloads in a power supply cir- cuit catering three-phase loads and for selectively trip- ping the load in the event of a single-phase overload or fault, uses a plug resistor as a sensing means to monitor the ripple content in an auctioneered output from three bridge rectifier circuits sensing the currents in all the three phases. A three-phase balanced overload or even a fault will cause much less ripple content than a single- phase overload condition. A circuit consisting of a resistance and capacitance in series is connected in parallel with the plug resistor, and, the voltage drop across the resistance is used to initiate tripping if the signal exceeds a predetermined magnitude, and after a selectable optional time delay. There is no need for an additional external power source to accomplish tripping. The apparatus desirably responds to single-phase faults and does not respond to motor inrush currents such as during starting.

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