Circuit breaker responsive to repeated in-rush currents produced

Details Circuit breaker responsive to repeated in-rush currents produced Circuit breaker responsive to repeated in-rush currents produced

1994-11-09

1999-08-17

Medley, Sally C.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

361 93, H02H 300

Patent

active

059402563

ABSTRACT:
A circuit breaker responds to sputtering arc faults by counting the times that a bandwidth limited di/dt signal exceeds a threshold magnitude within a selected time interval. In the exemplary circuit breaker, if the threshold is exceeded twice within a one second interval, a trip solenoid is energized. The di/dt sensor can share a sensing coil with a ground fault detector. Alternatively, the resistance of the neutral lead within the circuit breaker is utilized to sense current which is converted to a bandwidth limited di/dt signal for level detection and counting of sputtering arc events.

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Raytheon Publication, Linear Integrated Circuits 1989, Section 10, pp. 10-16 through 10-21.
Optimal Arcing Fault Detection Using Signal Processing Techniques; Li, et al.;Electric Power Systems Research, 21 (1991) pp. 121-128.

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