Directional detection in connection with faults in a power suppl

Details Directional detection in connection with faults in a power suppl Directional detection in connection with faults in a power suppl

1987-03-27

1988-03-15

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Feeder protection in distribution networks

361 81, 361 86, 564483, 324522, H01H 344

Patent

active

047316896

ABSTRACT:
A method and a device for directional detection of a fault on a power transmission line extending between two stations (P, Q). In one of the stations (P) there is a travelling wave model which, by means of currents and voltages measured in the station, calculates the voltage distirbution along the line. The direction to a fault is determined by monitoring changes in calculated voltages in the two stations. If a fault occurs between the stations, the voltage change occurring in a station (Q) between the voltage existing prior to a fault and after a fault can be estimated as .vertline..DELTA.Uq.vertline., and the corresponding voltage change occurring in the other station (P) can be estimated as .vertline..DELTA.Up.vertline., whereby according to the invention the difference .vertline..DELTA.Uq.vertline.-.vertline..DELTA.Up.vertline.>0 signifies a fault on the line side of the station (P), i.e. a fault lying ahead of the measuring point. A fault lying behind station P is evidenced when .vertline..DELTA.Uq.vertline.-.vertline..DELTA.Up.vertline.<0.

REFERENCES:
patent: 3590368 (1971-06-01), Esclangan
patent: 3956671 (1976-05-01), Nimmersjo
patent: 4351011 (1982-09-01), Liberman
patent: 4591992 (1986-05-01), Yamaura
patent: 4636909 (1987-01-01), Brandt

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