Electronic circuit breaker with protection against sputtering ar

Details Electronic circuit breaker with protection against sputtering ar Electronic circuit breaker with protection against sputtering ar

1991-09-26

1993-06-29

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

361 79, 361 95, H02H 332, H02H 326

Patent

active

052240061

ABSTRACT:
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.

REFERENCES:
patent: 3858130 (1974-12-01), Misencik
patent: 4081852 (1978-03-01), Coley et al.
patent: 4251846 (1981-02-01), Pearson et al.
patent: 4264856 (1981-04-01), Frierdich et al.
patent: 4707759 (1987-11-01), Bodkin
patent: 4893102 (1990-01-01), Bauer
patent: 4949214 (1990-08-01), Spencer
Raytheon Brochure, Preliminary Product Specifications Linear Integrated Circuits, RV4145 Low Power Ground Fault Interrupter pp. 2-7 Aug. 1990.

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