Ground fault circuit interrupter with grounded neutral protectio

Details Ground fault circuit interrupter with grounded neutral protectio Ground fault circuit interrupter with grounded neutral protectio

1977-11-21

1979-12-25

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

H02H 328

Patent

active

041808410

ABSTRACT:
A ground fault circuit interrupter includes a differential current transformer sensing winding supplying input to an integrator which is reset to zero at the end of each half-cycle of AC line current. A line-to-ground fault current will cause the integrator output to exceed a predetermined limit value and produce a trip indication. A saturable neutral transformer supplies a voltage to the neutral line and a reference current proportional to the neutral voltage to a comparator. The peak value of the reference current is compared to the peak value of the sensing winding output. A low-resistance neutral-to-ground path causes the sensing winding output to exceed the reference current and a signal to be added to the integrator input, thereby producing a trip indication which energizes an SCR to activate a solenoid. Means are provided to produce a positive feedback signal to insure a "hard" turn-on of the SCR upon receipt of a trip indication, the feedback means also including capability to "remember" a trip indication at the end of a half-cycle near current zero, and to produce the positive feedback signal at the beginning of the next succeeding half cycle.

REFERENCES:
patent: 3852642 (1974-12-01), Engel et al.
patent: 3953766 (1976-04-01), Howell et al.
patent: 3959693 (1976-05-01), Coley et al.

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