Protective relay for power system

Details Protective relay for power system Protective relay for power system

1982-12-28

1985-04-23

Eisenzopf, Reinhard J.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With tuned circuit

361 78, 361 86, 361 87, H02H 100

Patent

active

045133441

ABSTRACT:
A protective relay which generates a signal to protect an object in a power system that is to be protected in response to a differential signal and a suppress signal showing an abnormal condition, which are obtained from electric currents of two separate points in the object. The protective relay is equipped with a logical decision circuit which generates the signal to protect the object only when the differential signal is greater than a predetermined value, and the second harmonic component contained in the differential signal is smaller than a predetermined ratio.

REFERENCES:
patent: 3984734 (1976-10-01), Becker

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