H - Electricity – 02 – H
Patent
H - Electricity
02
H
348/24
H02H 3/16 (2006.01) H02H 3/33 (2006.01)
Patent
CA 1125901
46,960 GROUND FAULT CIRCUIT INTERRUPTER WITH GROUNDED NEUTRAL PROTECTION ABSTRACT OF THE DISCLOSURE 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 pre- determined 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 refer- ence 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 pro- duce 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 indica- tion 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.
313717
Mcconnell And Fox
Westinghouse Electric Corporation
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