Method and apparatus for the distance-selective fault monitoring

Details Method and apparatus for the distance-selective fault monitoring Method and apparatus for the distance-selective fault monitoring

1978-08-25

1980-09-09

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

361 85, H02H 726, H02H 326

Patent

active

042220858

ABSTRACT:
A method of, and apparatus for, the distance-selective monitoring of faults at electrical lines by means of a quadrilateral trigger or trip region. There are formed at least two reference signals of at least approximately the same phase and from each of these reference signals and the line voltage there is formed a respective difference signal. Each difference signal experiences a separate comparison with a related threshold phase angle in order to determine whether the monitored fault lies within or without the trip region.

REFERENCES:
patent: 2981867 (1961-04-01), Hopkins et al.
patent: 3413523 (1968-11-01), Hoel
patent: 3475655 (1969-10-01), Suzuki
patent: 3644788 (1972-02-01), Maenicke
"Protective Relaying System for 500 kv Transmission Line", by OHTA et al, 1975, Mar. pp. 361-368, I.N.S.P.E.C.

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