Magnetic flux shifting ground fault trip indicator

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

1975-11-04

1979-06-05

Broome, Harold

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

With magneto-mechanical motive device

335229, H01F 708

Patent

active

041575202

ABSTRACT:
A low energy mechanically driven and electromagnetically 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.

REFERENCES:
patent: 3783423 (1974-01-01), Mater et al.
patent: 3893052 (1975-07-01), Kotos et al.
patent: 3944957 (1976-03-01), Kotos et al.

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