Electronic circuit breaker using digital circuitry having instan

Details Electronic circuit breaker using digital circuitry having instan Electronic circuit breaker using digital circuitry having instan

1989-07-10

1990-07-24

Jennings, Derek S.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361 95, 361 97, H02H 208

Patent

active

049438883

ABSTRACT:
Instantaneous trip capability is provided to an electronic circuit breaker, which is of the type that generates trip signals by accumulating squares of power line current samples and thresholds the accumulation results. Samples of power line current are taken directly from the current transformer and analog-to-digital converter cascade generating them. The analog-to-digital converter is of an oversampling type, using a delta-sigma modulator. The samples are threshold detected against a prescribed threshold value without previous squaring, integration and detection. The threshold detector result is checked for two consecutive overcurrent indications before an instantaneous trip signal is generated.

REFERENCES:
patent: 4542354 (1985-09-01), Robinton et al.
patent: 4573037 (1986-02-01), Robinton et al.
patent: 4694373 (1987-09-01), Demeyer
patent: 4766416 (1988-08-01), Noujaim
patent: 4768018 (1988-08-01), Noujaim

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