Method and apparatus for monitoring conductor currents for a fau

Details Method and apparatus for monitoring conductor currents for a fau Method and apparatus for monitoring conductor currents for a fau

1980-02-08

1981-12-22

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

324117R, 361 93, H02H 328

Patent

active

043074294

ABSTRACT:
A method and apparatus for monitoring conductor currents for a fault current which changes the magnetic bias of a magnetic circuit in which the magnetization of the magnetic core is alternatingly reversed by sequences of magnetizing pulses and a determination made of the number of pulses up to which the pulse amplitude exceeds predetermined voltage reference value, with the change of this number of pulses used to derive an output signal.

REFERENCES:
patent: 3699442 (1972-10-01), Riley
patent: 4135222 (1979-01-01), Siepmann

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