Kalyan K Mustaphi

US Patent:

39639649, Jun 15, 1976

Filed:

Feb 7, 1975

Appl. No.:

5/548130

Inventors:

Kalyan K. Mustaphi - Minneapolis MN

Assignee:

Westinghouse Electric Corporation - Pittsburgh PA

International Classification:

H02H 328

US Classification:

317 27R

Abstract:

This disclosure relates to phase comparison relaying systems for a three phase power transmission line in which the current is measured at each end of each phase conductor. The phasor difference of the currents in a selected two of the phase conductors is determined at each end of the selected conductors and is phase compared to determine the location of phase-to-phase faults whether or not a ground fault is involved while the phasor sum of the current in all three of the phase conductors is determined at each end of the phase conductors and is phase compared to determine the location of phase-to-ground faults.