Protective plug capable of checking leakage of electricity

Abstract

The invention discloses a protective plug capable of checking leakage of electricity. The protective plug capable of checking leakage of electricity comprises three electrodes of a phrase line, a zero line and an earth line, an electricity leakage checking mutual inductor, a testing circuit, a release, a rectifying circuit, a power source depressurization and a controllable silicon, and the phrase line, the zero line and the earth line are respectively provided with a switch. The protective plug capable of checking leakage of electricity is further provided with a current checking mutual inductor, a voltage checking mutual inductor, a switching circuit and at least one amplifying circuit. The switching circuit is respectively connected with the current checking mutual inductor, a secondary coil of the voltage checking mutual inductor and an input end of the amplifying circuit. The switching circuit is used for choosing to connect the amplifying circuit and the voltage checking mutual inductor or to connect the amplifying circuit and the current checking mutual inductor. The output end of the amplifying circuit is connected with a controllable silicon trigger electrode, one end of the secondary coil of the voltage checking mutual inductor is connected with the ground, and the other end of the secondary coil of the voltage checking mutual inductor is connected with a big resistance value current-limiting depressurization circuit in series and then connected with the zero line. The protective plug capable of checking leakage of electricity overcomes the drawbacks that electrification of the traditional earth line induction voltage and the zero line leads to mistrip, enables functions of the protective plug capable of checking leakage of electricity to be abundant and is wide in protecting scope.

Description

technical field [0001] The invention relates to the technical field of detection plugs, in particular to a leakage detection protection plug. Background technique [0002] Existing plugs with live protection devices for ground wires, such as all-purpose leakage protection plugs, generally mean that the protection device (plug) can be disconnected when there is leakage in the phase and neutral wires, and it 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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