Method and apparatus for identifying a faulted phase

Details Method and apparatus for identifying a faulted phase Method and apparatus for identifying a faulted phase

G - Physics

01

R

324/29, 324/58.0

G01R 31/08 (2006.01) H02H 3/34 (2006.01) H02H 3/36 (2006.01)

Patent

CA 1312651

-23- WE54,176 Abstract of the Disclosure Faults in a three-phase power transmission line are identified by vectorially subtracting from the postfault current for each phase, the zero sequence current and the prefault current. The resultant currents which are the vectorial sums of the postfault positive and negative sequence currents are then compared. If the magnitude of the resultant current in one phase exceeds that in each of the other two phases by a preselected factor, that one phase is identified as the phase to ground faulted phase. If the magnitudes of the resultant currents of two phases exceed that of the third, those two phases are involved in either a phase to phase or a phase to phase to ground fault with the distinction being made by the presence of zero sequence current in the later case.

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