Fault location in a power supply network

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

1986-12-18

1989-01-10

Lall, Parshotam S.

Boots, shoes, and leggings

324509, 324522, 361 44, 364483, 364492, 364495, G06F 1520, G06F 1556

Patent

active

047978058

ABSTRACT:
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 transmission 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.U.sub.Qp 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.U.sub.Pp 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.U.sub.Pp and .DELTA.U.sub.Qq are calculated for station Q. The voltage difference .DELTA.P is then generated as the difference between .DELTA.U.sub.Qp and .DELTA.U.sub.Pp and the corresponding voltage difference .DELTA.Q is generated as the difference between .DELTA.U.sub.Pq and .DELTA.U.sub.Qq. The fault distance PF is then obtained as PF=.DELTA.P.PQ/(.DELTA.P+.DELTA. Q), where PQ is the distance between the stations.

REFERENCES:
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patent: 4455612 (1984-06-01), Girgis et al.
patent: 4466071 (1984-08-01), Russell et al.
patent: 4529929 (1985-07-01), Berggren
patent: 4559491 (1985-12-01), Saha
patent: 4570231 (1986-12-01), Bunch
patent: 4591992 (1986-05-01), Yamaura
patent: 4689709 (1987-08-01), Isahaya

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