Magnetic shielding means for a current sensor of direct current

Details Magnetic shielding means for a current sensor of direct current Magnetic shielding means for a current sensor of direct current

1991-08-26

1992-07-21

Broome, Harold

Electricity: circuit makers and breakers

Liquid contact

Time delay

200144R, 335201, H01H 944, H01H 930

Patent

active

051324970

ABSTRACT:
A Hall effect device is located in a focused gap of a flux concentrator disposed over one power terminal of a D.C. switching contactor to monitor flux induced by current flow. Magnetic fields from permanent magnets of the switching apparatus are shielded from the flux concentrator by a cup-shaped magnetic ring surrounding the concentrator, magnetically spaced therefrom, and a magnetic plate of the apparatus which is modified to accept more flux in a localized area of the sensor before saturation. The gap of the concentrator in which the Hall effect device is located is particularly positioned at a point where the magnetic field gradient from the permanent magnet field is minimum.

REFERENCES:
patent: 5004874 (1991-04-01), Theisen et al.

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