Protection of electrical power supply systems

Details Protection of electrical power supply systems Protection of electrical power supply systems

1983-03-02

1986-10-14

Krass, Errol A.

Boots, shoes, and leggings

324 52, 361 79, 361 80, G01R 3108, G01R 2708, H02H 342

Patent

active

046176365

ABSTRACT:
A fault in a section of an electrical power supply line is detected by measurement of voltage and current, filtering out high frequency components, and calculating approximations of Fourier transforms of a time window of the voltage and current at a predetermined frequency modified by a continuous phase change at that frequency and then calculating the impedance of the section from the modified Fourier transforms of voltage and current (FIG. 2).

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A. Wiszniewski, How to Reduce Errors of Distance Fault Locating Algorithms, IEEE Transactions, vol. PAS-100, Dec. 12, 1981.
A. Wiszniewski, Signal Recognition in Protective Relaying, IEE International Conference, Jun. 1980.

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