Overcurrent relay apparatus

Details Overcurrent relay apparatus Overcurrent relay apparatus

1978-12-20

1980-08-26

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361 96, 364483, H02H 308

Patent

active

042198607

ABSTRACT:
Digital overcurrent relay apparatus utilizing sampling, digital conversion and digital comparison techniques is described. The apparatus provides a trip signal after an alternating current in a line being monitored by the apparatus exceeds a preset pick up value for a period of time which is an inverse function of the magnitude of the current expressed in multiples of pick up value.

REFERENCES:
patent: 3569785 (1971-03-01), Durbeck et al.
patent: 3885199 (1975-05-01), Nohara et al.
patent: 4077061 (1978-02-01), Johnston et al.

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