Electric leakage detection protector

Abstract

The invention provides an electric leakage detection protector, which comprises a first fault detection part and a circuit interruption part. The first fault detection part comprises a first current conduction part and a sampling control circuit, wherein on end of the first current conduction part is connected with a phase line while the other end is connected with a voltage sampling point on a ground wire so that a loaded electric connection is established between the phase line and the voltage sampling point; and one end of the sampling control circuit is connected with the voltage samplingpoint, and a control electric signal is generated when the voltage of the voltage sampling point exceeds a first scheduled threshold voltage. The circuit interruption part is used for interrupting theelectric connections on the phase line and a zero line under the control of the control electric signal. The electric leakage detection protector can detect whether the ground wire is connected normally and whether the phase line and the zero line are connected reversely, and the electric leakage detection protector can also comprise a residual current protective circuit to further detect the current unbalance on a live wire and the zero line.

Description

technical field [0001] The invention relates to a leakage protection device, in particular to a leakage protection device used for power plugs, sockets and leakage circuit breakers. Background technique [0002] Leakage of electrical appliances can easily cause personal injury to users. Therefore, power plugs or sockets with residual current protection functions are usually installed on the power input side of electrical appliances such as electric water heaters and refrigerators. Existing power plugs or sockets generally have a residual current protection function. When the leakage between the phase line and the ground reaches the set value, the power circuit of the electrical equipment is disconnected to protect personal safety and avoid electric shock. [0003] figure 1 It is a schematic circuit diagram of an existing residual current protection circuit. Such as figure 1 As shown, the residual current protection circuit is composed of the current mutual inductance dete...

AI Technical Summary

Problems solved by technology

But at this time, the electric current passing through the human body may have caused certain harm to the human body.

If the residual current protector is still charged after the input / output is disconnected, the current will still pass through the human body to form a loop when the human body touches the electrical shell, and the current passing through the human body can directly lead to electric shock casualties, resulting in serious as a result of

If the phase line and the neutral line are reversed, it will also seriously affect the personal safety of electrical appliances and users, and may even cause major losses such as fire.

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