Electronic circuit breaker with protection against...

Details Electronic circuit breaker with protection against... Electronic circuit breaker with protection against...

H - Electricity

02

H

H02H 3/14 (2006.01) H01H 83/02 (2006.01) H02H 1/00 (2006.01) H02H 3/16 (2006.01) H02H 3/33 (2006.01) H01H 71/28 (2006.01) H02H 1/04 (2006.01) H02H 1/06 (2006.01) H02H 3/093 (2006.01) H02H 3/44 (2006.01)

Patent

CA 2079183

A circuit breaker bandwidth limits a sensed rate of change of current, di/dt, in the neutral conductor of a protected electrical system and fullwave rectifies the. bandwidth limited di/dt signal for comparison with an instantaneous trip reference signal. The bandwidth is selected to provide a selected relative sensitivity of the instantaneous trip to sinusoidal currents associated with overcurrent faults and step currents associated with sputtering arc faults. The rectified bandwidth limited di/dt signal is also filtered and delayed for comparison with a delayed trip reference signal. The time constant for the filter is selected to provide a selected relative sensitivity of the delayed trip to overcurrent faults and sputtering arc faults. A low mu sensing coil used to generate the di/dt signal can also serve as the neutral current sensing coil of a dormant oscillator ground fault protection system.

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