Directional detection in connection with faults in a power...

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

H - Electricity

02

H

348/13

H02H 7/26 (2006.01)

Patent

CA 1285644

- 26 - ABSTRACT OF THE DISCLOSURE 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 distribution along the line. The direction to a fault is determined by monitoring changes in cal- culated 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 ¦.DELTA.Uq¦, and the corresponding voltage change occurring in the other station (P) can be estimated as ¦.DELTA.Up¦ , whereby according to the invention the difference ¦.DELTA.Uq¦-¦.DELTA.Up¦>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¦.DELTA.Uq¦-¦.DELTA.Uq¦<0.

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