Ground fault circuit interrupter module

Details Ground fault circuit interrupter module Ground fault circuit interrupter module

H - Electricity

02

H

348/24

H02H 3/28 (2006.01) H02H 3/33 (2006.01)

Patent

CA 1104243

GROUND FAULT INTERRUPTER MODULE Abstract of the Disclosure The module is composed of the internal electronic circuitry and components of a ground fault circuit interrupter, and is designed for use with a power supply system having a neutral conductor and at least one line conductor and carry- ing current between a source and a load, with the neutral conductor being grounded at the source and the supply system including a system circuit interrupter or circuit breaker operable responsive to application of a potential to an operating element such as a solenoid. The module includes first and second current transformers embracing the neutral conductor and at least one line conductor of the power supply system. A resistor is connected across the terminals of the secondary winding of the first current transformer so that a potential appears across the resistor responsive to inequality of the currents carried by the neutral and line conductors, as a result of a ground fault. An operational amplifier has its input connected across the resistor and a feedback network is connected between the input and output of the amplifier to control the gain thereof. The output of the amplifier is connected to the base of a transistor controlling triggering of an SCR which, when conductive, acts as a switch across terminals connected to the solenoid so as to energize the solenoid to trip the power system circuit breaker. The secondary winding of the second current transformer is coupled by a capacitor to the output of the amplifier. When the volt- age across the resistor at the input of the amplifier reaches a predetermined value, responsive to a ground fault, the amplifier output is sufficient to trigger the transistor con- ductive. If the neutral conductor becomes grounded on the load side of the two current transformers, it forms an ef- fective loop extending through the cores of both current transformers, so that the two current transformers form a magnetic coupling between the output and the input of the amplifier. The amplifier then breaks into high frequency oscillation and the high frequency signal on the transistor triggers the same conductive to trigger the SCR conductive. Thus, only one electric circuit performs both basic functions of a ground fault circuit interrupter with a corresponding substantial reduction in components and increase in relia- bility and economy of operation. -2-

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