All-purpose leakage protection plug for ground wire live trip

Abstract

An all-functional leakage protection plug for ground wire charged tripping comprises a contact, a phase electrode, a zero electrode and a ground electrode of a contact switch, a zero sequence current transformer penetrated between a phase wire and a zero wire, a test loop, an amplifying circuit, a rectifier, controlled silicon, a tripping device, a zero sequence current transformer penetrated through a ground wire, a trigger circuit, an opto-coupler switch and electric resistances, wherein the contact is equipped with a moving contact elastic blade, the contact switch is equipped with a static contact blade, the opto-couple switch comprises a neon lamp and a photo triode the neon lamp and the photo triode are placed in a dark box, the dark box is equipped with a small hole keeping away from the photo triode, the neon lamp is in parallel connection with an electric resistance, and is in series connection with another electric resistance after parallel connection, two ends after series connection are connected with input ends of the zero wire and the ground wire, a collector electrode of the photo triode is connected with the positive electrode of the power source of the amplifying circuit, and an emitting electrode is connected with a trigger electrode of the controlled silicon. The invention has the advantages of tripping and switching off when the ground wire charges to achieve certain voltage to guarantee safety of users, further increasing use safety, prompting users to check and remove potential safety hazard timely, and guaranteeing electricity utilization safety.

Description

technical field [0001] The invention relates to an electric leakage protection plug, in particular to an all-round electric leakage protection plug capable of tripping when the ground wire is live. Background technique [0002] The existing all-round earth leakage protection plug generally includes the phase, zero and ground three poles of the contact switch with the contact shrapnel and the contact switch with the static contact piece, the zero-sequence current transformer passing through the phase and the neutral line, Test circuit, amplifying circuit, rectifier, thyristor, release, zero-sequence current transformer passing through the ground wire and trigger circuit, which not only detects whether there is leakage current between the load phase and the neutral wire, but also detects the ground wire Whether there is a leakage current, when the leakage current between the phase wire, neutral wire or ground wire and the earth occurs separately or simultaneously, the two dete...

AI Technical Summary

Problems solved by technology

However, there are strict requirements for zero connection protection. If there is a fault in the power grid (the ground wire buried deep in the substation is broken or poor contact) or the phase and zero of the user's power supply system are dislocated, the zero protection line and the zero line will be charged, so that the user If the ground wire of the electrical system is electrified, the transformers of the phase and neutral wires or the transformer of the ground wire cannot detect the leakage current signal with the earth. Therefore, when the ground wire is electrified, the user still cannot know the risk factor that the ground wire is electrified. The existence of electric shock accidents will occur at any time, so the existing all-round leakage protection plug still has serious safety hazards

Images