Ground fault interrupter

Details Ground fault interrupter Ground fault interrupter

1973-03-28

1980-08-05

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

361 46, H02H 328

Patent

active

042165156

ABSTRACT:
A ground fault interrupter for two and three wire, single phase load circuits employing a circuit breaker having an electro-responsive contact trip-open mechanism, a fault sensing differential transformer, an operational amplifier providing characteristic output pulses whose magnitude depends upon the non-presence or presence of a ground fault and whether the latter is resistive or reactive in kind, and an energizing circuit for the electro-responsive contact trip-open mechanism including a transistor which is normally held non-conducting in the absence of a ground fault and rendered conducting whenever a resistive ground fault occurs. A capacitor in circuit with the amplifier output and transistor base renders the transistor immune from amplifier pulses characteristic of reactive ground faults. Varistors are included between the load circuit wires to suppress transient voltage surges from falsely inducing nuisance ground fault interrupting action.

REFERENCES:
patent: 3555359 (1971-01-01), Morris
patent: 3700967 (1972-10-01), Hoss
patent: 3736468 (1973-05-01), Reeves et al.
patent: 3787709 (1974-01-01), Coe
patent: 3852642 (1974-12-01), Engel et al.

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