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

1988-03-07

1989-01-03

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

For fault location

361 76, 361 79, 364483, 324509, 324522, G01R 3108, H02H 334, H02H 336

Patent

active

047959835

ABSTRACT:
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, than 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.

REFERENCES:
patent: 3992651 (1976-11-01), Hodges
patent: 4275429 (1981-06-01), Church et al.
patent: 4321681 (1982-03-01), Sackin et al.
patent: 4390835 (1983-06-01), Elkateb et al.
patent: 4398232 (1983-08-01), Elmore
patent: 4631625 (1986-12-01), Alexander et al.
patent: 4751653 (1988-06-01), Junk et al.

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