Fault location in a power supply network

Details Fault location in a power supply network Fault location in a power supply network

G - Physics

01

R

324/58.03

G01R 31/08 (2006.01) G01R 31/11 (2006.01)

Patent

CA 1261921

ABSTRACT OF THE DISCLOSURE A method for location of a fault on a transmission line in a network for distribution and transmission of electric power uses a travelling wave model of the trans- mission line positioned in measuring stations (P, Q) at either end of the transmission line, to obtain the voltage distribution along the transmission line, seen from both station P and station Q. A voltage .DELTA.UQp is generated as the difference between the voltage in station P, calculated in the travelling wave model in station Q, and the corresponding voltage one period/half period earlier. A voltage .DELTA.UPp is generated as the difference between the voltage, calculated in the travelling wave model in station P, and the corresponding voltage one period/half period earlier. The corresponding voltage differences .DELTA.UPp and .DELTA.UQq are calculated for station Q. The voltage difference .DELTA.P is then generated as the difference between .DELTA.UQp and .DELTA.UPp and the corresponding voltage difference .DELTA.Q is generated as the difference between .DELTA.UPq and .DELTA.UQq. The fault distance PF is then obtained as PF = .DELTA.P?PQ/(.DELTA.P+.DELTA.Q), where PQ is the distance between the stations.

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