Electric leakage protection plug

Abstract

The invention relates to an electric leakage protection plug, comprising a shell, a plug pin, a phase line, a zero line, a ground wire, a zero sequence current mutual inductor, a test loop, an electromagnetic tripping locking device, a ground wire fault current detection circuit, a ground wire fault voltage detection circuit, a first change-over switch, a second change-over switch, and a unidirectional conducting circuit. A secondary winding output end of the zero sequence current mutual inductor is connected with a first input end and a second input end of an amplifying circuit. An output end of the unidirectional conducting circuit is directly connected with a control electrode of controllable silicone. A secondary winding output end of a ground wire electrification detection inductor connected with the second change-over switch is connected with a second input end and a third input end of the amplifying circuit. A trigger output end of the amplifying circuit is connected with the control electrode of the controllable silicone through a second diode. The electric leakage protection plug can switch selection between a ground wire fault current protection mode and a ground wire fault electricity protection voltage mode, solves the problem of wrong tripping of the electric leakage protection plug, and ensures that electricity utilization by people is safer.

Description

technical field [0001] The invention relates to the technical field of electricity safety protection, in particular to an electric leakage protection plug. Background technique [0002] Existing leakage protection plugs can be divided into two types of products: ground fault current detection and protection and ground fault voltage detection and protection according to the detection and protection methods for live wires. [0003] Chinese patent document CN1142618C discloses a leakage protection plug capable of detecting ground wire fault current. The leakage protection plug can detect whether there is a fault current in the ground wire when the ground wire is accidentally electrified due to an abnormal ground protection system, and the ground wire fault current reaches When the preset threshold value is reached, it will immediately cut off the phase wire, neutral wire and ground wire. It can be seen from this that as long as the fault current of the ground wire reaches a pr...

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to provide a leakage protection plug, which can not only detect the fault current and voltage of the ground wire, but also selectively switch the live protection function of detecting the fault current and fault voltage of the ground wire, This not only solves the problem that the leakage protection plug cannot be used due to false tripping, but also reduces the after-sales maintenance rate and maintenance cost.

Images