Magnetic flux shifting ground fault trip indicator

Details Magnetic flux shifting ground fault trip indicator Magnetic flux shifting ground fault trip indicator

H - Electricity

01

H

306/51.1

H01H 71/32 (2006.01) H01F 7/16 (2006.01) H02H 3/04 (2006.01) H02H 3/34 (2006.01) G01R 31/02 (2006.01)

Patent

CA 1053298

MAGNETIC FLUX SHIFTING GROUND FAULT TRIP INDICATOR ABSTRACT OF THE DISCLOSURE A low energy mechanically driven and electromag- netically actuated ground fault trip indicator is taught. The ground fault trip indicator utilizes the magnetic flux of a permanent magnet in a first flux path to maintain a movable armature biased against a spring. An electromagnet is disposed to provide magnetic flux in opposition to the magnetic flux of the permanent magnet. The electromagnet is not energized for providing the opposing flux until a pulse is received from an appropriate ground fault trip detecting circuit. When the appropriate pulse of energy is applied to the electromagnet, a portion of the flux of the permanent magnet is cancelled allowing the spring to force the armature into a new position. In this position the flux of the permanent magnet is reestablished in a second flux path. When the indicator is in the latter position indication of the occurrence of a ground fault is given.

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