Patent ID: 9640977
Date: 2017-05-02
CPC Classifications: H02H

Claim:
1. A leakage current detecting circuit-breaker with a flexible shield cord comprising a detection circuit, a trigger circuit and a tripping mechanism, wherein the detection circuit detects and amplifies an abnormal or fault signal of a power line and transmits the amplified signal to the trigger circuit, so that the trigger circuit is turned on, thereby controlling the tripping mechanism to be disengaged and then disconnecting a current connection to a load end, wherein the detection circuit comprises a flexible shield cord, a zero sequence current transformer and diodes connected in series, the flexible shield cord comprises a metal foil wrapped around outer insulating layers of a live line and a neutral line and a tinned copper wire between the outer insulating layers and the foil, the flexible shield cord senses the abnormal or fault signal of the power line, the zero sequence current transformer amplifies the abnormal or fault signal to such an extent as to trigger the trigger circuit, the diodes comprise a fifth diode and a sixth diode, anodes of the fifth diode and the sixth diode are connected to each other, and cathodes of the fifth diode and the sixth diode are respectively connected to the live line and the neutral line; wherein the trigger circuit comprises a rectifier bridge, a silicon controlled rectifier and a tripping coil connected in series, a gate of the silicon controlled rectifier is connected to an output terminal of the zero sequence current transformer, and power is supplied to the rectifier bridge via the live line and the neutral line; wherein the trigger circuit further comprises an anti-interference circuit the anti-interference circuit is connected in parallel between an anode and a cathode of the silicon controlled rectifier and comprises a second capacitor connected to the anode of the silicon controlled rectifier and a fourth resistor connected to the cathode of the silicon controlled rectifier.