Overcurrent protection device

Details Overcurrent protection device Overcurrent protection device

1984-07-24

1987-09-29

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

361 94, 361100, 361110, H02H 3093

Patent

active

046972188

ABSTRACT:
The device, for AC operation, is applicable more especially to the protection of very high tension installations. It comprises a rectifier (12), a comparator for comparing the rectified current and a threshold value (s) and for making, in the case of overshoot, a new comparison after a time equal to and 1/2T+.DELTA.T, T being the nominal period of the AC current and .DELTA.T a fraction of T of the order of a tenth, after overshoot. The new comparison is made with a circuit comprising a memory (22), a timer (24) and a circuit (34) including two inverters and an AND gate. Tripping is produced if overshoot occurs during the new comparison.

REFERENCES:
patent: 4208692 (1980-06-01), Rohr
patent: 4255774 (1981-03-01), Breen
patent: 4423458 (1983-12-01), Stich
patent: 4432031 (1984-02-01), Premerlani

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