Ground fault circuit interrupter utilizing a single transformer

Details Ground fault circuit interrupter utilizing a single transformer Ground fault circuit interrupter utilizing a single transformer

H - Electricity

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348/24

H01H 47/00 (2006.01) H02H 3/33 (2006.01)

Patent

CA 1128186

41PR-3119 IMPROVED GROUND FAULT CIRCUIT INTERRUPTER UTILIZING A SINGLE TRANSFORMER ABSTRACT A single transformer is alternately operated as a differen- tial current transformer with its secondary winding connected as the input to a low impedance differential amplifier with large negative feedback during a ground fault current sampling period and then as a coupled resonant circuit operating into a negative resistance network during a neutral-to-ground resistance sampling period. During the fault current sampling period, the amplifier is gated ON and OFF to switch the transformer secondary loading between essentially short-circuit and open-circuit conditions. The result- ing amplifier feedback current pulses, indicative of transformer secondary current, are integrated either directly or indirectly, to develop a DC signal proportional to any ground fault current.

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