Ratio ground relay

Details Ratio ground relay Ratio ground relay

G - Physics

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R

324/29

G01R 11/40 (2006.01) G01R 5/20 (2006.01) H02H 3/34 (2006.01)

Patent

CA 1181130

18 ABSTRACT OF THE DISCLOSURE A ratio ground induction disc relay which de- tects open phase conductors on electrical distribution circuits, as well as single phase-to-ground faults regard- less of fault impedance, by providing an operating quanti- ty responsive to zero sequence current, and a restraining quantity responsive to the positive sequence current I1 minus the negative sequence current I2. The restraint quantity is provided by an electromagnetic having first and second outer legs and an inner leg. Electrical wind- ings are disposed on only the first and second outer legs, arranged and energized by the three phase currents to provide equal length flux paths, and thus equal torques, regardless of the faulted phase.

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