Ground fault circuit interrupter

Details Ground fault circuit interrupter Ground fault circuit interrupter

1977-08-04

1981-07-21

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

324117R, 361 50, 361204, H02H 328

Patent

active

042801621

ABSTRACT:
A device for sensing current flow in an electric conductor employs a ferromagnetic core coupled to the conductor and a control winding on the core for applying a periodic magnetic flux to a part of the core of a magnitude to vary the core permeability, preferably driving a part of the core in and out of saturation. The periodic flux interrupts any flux circulating in the core due to current flow in the conductor. An output winding on the core has a signal voltage induced therein whose amplitude is determined by the rate of change of the interrupted circulating flux. The device effectively amplifies a small current input signal to a relatively high output level. A bias winding may be wound on the core to compensate for stray magnetic fields in the vicinity of the device.

REFERENCES:
patent: 2958036 (1960-10-01), Gilbert
patent: 3396338 (1968-08-01), Buchanan et al.
patent: 3465250 (1969-09-01), Schilling
patent: 4021729 (1977-05-01), Hudson, Jr.

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