Fault location method and device

Details Fault location method and device Fault location method and device

2005-08-02

2005-08-02

Nguyen, Vincent Q. (Department: 2858)

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

For fault location

C702S059000, C361S080000

Reexamination Certificate

active

06924647

ABSTRACT:
The present invention relates to a method for calculating the distance to fault in a section of a power transmission network, which section is arranged with line terminals at both ends, each terminal including impedance relays (AA, BB), including the steps of, at the occurence of a fault; measuring the apparent impedances by each relay, measuring the relaying currents, determining the type of fault, checking whether the fault involves a fault resistance or not, and, if so, solving a quadratic equation for complex numbers, resolving the quadratic equation for the real and imaginary components, obtaining two quadratic equations for a fault distance in which the coefficients are real numbers, combining the two equations and obtaining a distance to fault, or, if not so, solving a quadratic equation for real numbers, obtaining two solutions for the distance to fault d1, d2and comparing the solutions as 0<(d1or d2)<1 pu, where pu is the length of transmission lines between the line terminals.

REFERENCES:
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M.S. Sachdev et al., A Technique for Estimating Transmission Line Fault Locations from Digital Impedance Relay Measurements, IEEE Transactions on Power Delivery, vol. 3, No. 1, Jan. 1988, pp. 121-129.
M.S. Sachdev et al., Accurate Fault-Location Estimates from Digital Impedance Relay Measurements, Proceedings of Third International Conference on Developments in Power System Protection, London, Apr. 17-19, 1985, Conference Publication No. 249, pp. 180-184.

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