Ground fault circuit interrupter with trip level adjustment

Details Ground fault circuit interrupter with trip level adjustment Ground fault circuit interrupter with trip level adjustment

1975-10-24

1977-11-01

Miller, J D

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

H02H 328

Patent

active

040568377

ABSTRACT:
A sensing amplifier of half wave sensitivity has its trip level effectively changed without internal adjustment in the sensing amplifier by a circuit branch connected between respective points on the hot line conductor and the neutral conductor across the differential transformer core and containing a resistance for causing additional current flow vectorially added to differential current otherwise occurring between the primary windings.

REFERENCES:
patent: 3296493 (1967-01-01), Whittaker et al.
patent: 3558980 (1971-01-01), Florance et al.
patent: 3633070 (1972-01-01), Vassos et al.
patent: 3676737 (1972-07-01), Garzon
patent: 3852642 (1974-12-01), Engel et al.
patent: 3930187 (1975-12-01), Misencik

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