GROUND FAULT PROTECTION SYSTEM INCLUDING IMPROVED IMPEDANCE DETECTING MEANS

摘要

A ground fault protective system in which an impedance responsive oscillator detects low impedance ground faults on the neutral conductor of an electrical distribution circuit and responds thereto to provide a partially or totally attenuated output signal. A demodulator, magnetically coupled to the oscillator, provides a direct current voltage output signal related in value to the magnitude of the oscillator signal. The demodulator output signal may be used by control circuitry to interrupt the distribution circuit.