Leakage protection plug circuit

Abstract

The invention discloses an electric leakage prevention plug circuit which comprises an indicating lamp circuit, a null wire, a ground wire, a live wire, a buckle releasing device, a rectifying circuit, a step-down circuit, a reverse isolation circuit, an overtemperature detection circuit, a testing circuit, a first resistor, a first magnetic induction loop, a first amplifying circuit, controllable silicon, a second magnetic induction loop, a third magnetic induction loop and a second amplifying circuit. According to the electric leakage prevention plug circuit, the type of a needed mutual inductor can be chosen through a change-over switch, and the defect of mistrip caused by the charged null wire is overcome.

Description

technical field [0001] The invention relates to the field of electrical safety protection devices, in particular to a leakage protection plug circuit. Background technique [0002] Existing plugs with live protection devices for ground wires, such as all-purpose leakage protection plugs, generally mean that they can be disconnected when the protection device (plug) leaks in the phase and neutral wires, and can also be disconnected when the ground wire is charged. It generally includes the phase, zero and ground three poles connected by the moving contact elastic sheet and the static contact, the zero-sequence current transformer passing through the phase and the neutral line, the test circuit, the amplifier circuit, the rectifier, the thyristor, the disconnector Buckle, zero-sequence current transformer passing through the ground wire, in addition to detecting whether there is leakage current between the load phase and neutral wire, it also detects whether there is leakage c...

AI Technical Summary

Problems solved by technology

[0004] 1. When the voltage detection transformer on the ground line is used for detection, the current on the user's ground line is very complicated, and it is easy to generate induced voltage and cause false tripping

[0005] 2. In actual use, some substations have charged zero line. This kind of electricity has no effect on electrical appliances, but it is easy to trigger the detection of the voltage detection transformer on the ground line and cause false tripping.

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