Electric leakage protection plug

A leakage protection plug and resistor technology, which is applied to emergency protection circuit devices, automatic disconnection emergency protection devices, circuits, etc., can solve problems such as electric shock accidents and no grounding
CN102354867BActive Publication Date: 2013-07-24ๅˆ˜็ฟๅˆš
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Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Patents(China)
Current Assignee / Owner
ๅˆ˜็ฟๅˆš
Publication Date
2013-07-24

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Abstract

The invention discloses an electric leakage protection plug, which can prevent an electric shock accident caused by electrical faults and can prevent the electric shock accident caused by accidental electrification of a ground wire. The electric leakage protection plug is provided with a weak current detection sensor, wherein a primary winding and a secondary winding of the weak current detectionsensor are insulated and separated from each other and wound on an iron core of the weak current detection sensor; a detection loop which is formed by connecting the primary winding and a current-limiting capacitance resistance element in series is connected between the ground wire and a zero line; a second thyristor and a first amplification circuit are arranged in a driving circuit of an electromagnetic coil; output ends of the secondary winding of the weak current detection sensor are respectively connected with an input end of the first amplification circuit in parallel; an anode, a cathode and a trigger electrode of the second thyristor are respectively connected with positive and negative electrodes of the output end of a rectification circuit and the output end of the amplificationcircuit; and the output ends of the secondary winding of a zero-sequence current transformer are respectively connected with the input end of the driving circuit of the electromagnetic coil in parallel.
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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] Chinese patent document CN1142618C discloses a kind of earth leakage protection plug which can be opened and closed. The earth leakage protection plug is not only provided with a zero-sequence current transformer through which both the phase wire and the neutral wire pass, but also has a ground wire through which the earth wire passes. Line live detection sensor, so it can not only detect whether there is residual current between the phase line and the neutral line at the load end, when there is a residual current between the phase and neutral lines and reaches the preset threshold (for example: 10mA), it will It will trip immediately, cut off the phase wire, neutral wire and ground wire; and when the ground wire is accidentally electrified due to abnormal grounding system, it can also detect...

Claims

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