Protective relay arrangements

Details Protective relay arrangements Protective relay arrangements

1975-11-17

1977-12-13

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

361 79, 361 80, 361 84, H02H 326

Patent

active

040633004

ABSTRACT:
A protective relay arrangement for an A.C. power system wherein the occurrence of a fault is detected by monitoring the phase or amplitude relation between at least one pair of signals which, when a fault occurs in the system, are functions of a current and/or voltage which would have occurred in the power system if the or each emf source in the system had a value equal to the pre-fault voltage at the point in the system where the fault has occurred.

REFERENCES:
patent: 3210606 (1965-10-01), Calhoun
patent: 3303390 (1967-02-01), Sonnemann

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