G - Physics – 01 – R
Patent
G - Physics
01
R
324/58.03
G01R 31/08 (2006.01) H02H 7/26 (2006.01)
Patent
CA 1199066
ABSTRACT OF THE DISCLOSURE Protective relay apparatus and method for deter- mining the faulted phase conductor of a three-phase ac electrical transmission line. The voltage and current on each conductor are measured and the steady-state ac elec- tric power signal removed. The resulting filtered-voltage signals are multiplied by the characteristic admittance of the transmission line and then combined with the filtered- current signals to produce three current signals represent- ative of the current on each conductor caused by an inci- dent traveling wave and three current signals represent- ative of the current on each conductor caused by a forward traveling wave. A comparator compares the six current signals to provide an indicaton of the direction to the fault and to provide an enable signal when the fault is on the protected line segment. The three incident-wave current sigals are filtered to provide a modal signal representing the total current produced on the trans- mission line by a first propagational mode of the incident traveling wave. A discriminator processes the three incident-wave signals, the modal signal, and the enable signal to provide an indication of the faulted phase conductor.
433118
Oldham And Company
Westinghouse Electric Corporation
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