Ratio ground relays

Details Ratio ground relays Ratio ground relays

G - Physics

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G01R 11/40 (2006.01) G01R 5/20 (2006.01) G01R 11/42 (2006.01) H02H 3/34 (2006.01)

Patent

CA 1181131

18 ABSTRACT OF THE DISCLOSURE Ratio ground induction disc relays for detecting open phases and phase-to-ground faults. An operating torque is applied to the induction disc which varies as a function of the zero sequence current. The phase currents are utilized in different arrangements to provide a re- straining torque which varies as a function of predeter- mined different parameters, such as the sum of certain phase currents, the positive sequence current, or the positive sequence current minus the negative sequence current.

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