RESIDUAL CURRENT CIRCUIT BRAKER WITH CUT-OFF PROTECTION DUE TO INSTANT GROUNDING AND RESIDUAL CURRENT ALARM

摘要

The present invention relates to a leakage circuit breaker with an instant ground fault protection and a leakage alarm which introduces a technique of delaying a breaking time of a circuit breaker in a range in which a body is not damaged when a human body is electrically shocked and prevents a power outage of an electric line caused by instant ground fault due to a rat or birds, instant ground fault due to moisture or dust and the like. Also, the present invention performs a leakage alarm flickering an LED lamp when a resistive leakage current is equal to or greater than 5 [mA] to prevent a fire caused by a short circuit, performs pulse width modulation of the resistive leakage current to remotely monitor a leakage state by a manager and installs a pulse signal output terminal capable of transmitting a pulse signal to the outside wirelessly and through a wire. In addition, the leakage circuit breaker comprises a ZCT, a composite leakage current detection unit, a synchronizing signal generator, a resistive leakage current calculation unit, a composite leakage current calculation unit, a first comparator, a circuit breaking apparatus and a contact point, a composite leakage current breaking reference value setting unit, a second comparator, a leakage alarm reference value setting unit, a third comparator, a leakage alarm, a resistive leakage current and breaking time delay tolerance setting unit, a breaking time delay unit, and a pulse width modulator.