Overcurrent circuit interrupter using RMS sampling

Details Overcurrent circuit interrupter using RMS sampling Overcurrent circuit interrupter using RMS sampling

1985-11-19

1987-08-04

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361 96, 361 86, H02H 327

Patent

active

046850244

ABSTRACT:
An electronic overcurrent circuit interrupter utilizes a digital processor for performing RMS sampling of circuit current for comparison to stored long time and short time current values and time delays before tripping the breaker. A magnetic core current transformer is employed for providing an output current signal to the digital processor. Upon detecting core saturation, which occurs at high currents, an analog detection circuit interrupts the RMS sampling and causes the digital processor to time out the shortest pre-selected time delay before tripping the breaker.

REFERENCES:
patent: 3633073 (1972-01-01), Day et al.
patent: 4276605 (1981-06-01), Okanoto et al.

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