Electricity leakage warning

摘要

The invention discloses an electric leakage warning and protection circuit which includes a zero-sequence transformer, a overcurrent sensor and a zero line electricity leakage sensor are sequentially arranged and connected with a first control module, the first control module is further connected with a control end of a first silicon controlled rectifier, the first silicon controlled rectifier and a tripping coil are serially connected with each other and are jointly arranged between an anode and a cathode of the power module, an electric leakage display circuit is provided with a second silicon controlled rectifier and a first light emitting diode, the second silicon controlled rectifier is serially connected with the first light emitting diode, and a control end of the second silicon controlled rectifier is connected with the second control module. The electricity leakage warning and protection circuit has advantages of implementing electricity leakage warning and automatic tripping protection, so that the safety is greatly improved.

主权项

1. An electricity leakage warning and protection circuit, comprising: a power module, a first control module, a second control module, a zero-sequence transformer, an overcurrent sensor, a zero line electricity leakage sensor, a tripping coil, a first silicon controlled rectifier, a reset switch and an electric leakage display circuit, the power module used to rectificate and filter inputted commercial electricity to dc power and provide load voltages to the first control module, the second control module and the electric leakage display circuit;
the zero-sequence transformer arranged between a live line and a null line, the overcurrent sensor arranged on the live line, the zero line electricity leakage sensor arranged between the live line and the null line; the zero-sequence transformer, the overcurrent sensor and the zero line electricity leakage sensor sequentially arranged to enable resonance to be generated between the zero-sequence transformer and the zero line electricity leakage sensor; the zero-sequence transformer, the overcurrent sensor and the zero line electric leakage sensor electrically connected with the first control module which is connected with a control end of the first silicon controlled rectifier, and the first silicon controlled rectifier and a tripping coil serially connected and jointly arranged between an anode and a cathode of the power module; and wherein the tripping coil controls turning on/off of the reset switch; wherein the electric leakage display circuit comprises a second silicon controlled rectifier and a first light emitting diode, the second silicon controlled rectifier and the first emit light are serially connected and jointly arranged between the anode and the cathode of the power module, and the control end of the second silicon controlled rectifier is electrically connected with the second control module.