Electric leakage protection device

Abstract

The invention provides an electric leakage protection device, which comprises a voltage input end, an electric leakage protection circuit and a voltage output end, and is characterized in that the electric leakage protection circuit comprises a piezoresistor RV, a first inductor L1, a second inductor L2, a first high-withstand-voltage capacitor CX1, a second high-withstand-voltage capacitor CX2, a resistor R1 and a fuse FU, wherein the voltage input end, the first inductor L1, the first high-withstand-voltage capacitor CX1, the second high-withstand-voltage capacitor CX2, the second inductor L2 and the piezoresistor RV are sequentially connected in series, one end of the resistor R1 is connected to a part between the first high-withstand-voltage capacitor CX1 and the second high-withstand-voltage capacitor CX2, the other end of the resistor R1 is grounded, and the fuse FU is connected with the voltage output end and arranged in a mode of being connected with the first high-withstand-voltage capacitor CX1 and the second high-withstand-voltage capacitor CX2 in parallel. The electric leakage protection device provided by the invention can provide an electric shock buffering period for an electric shock human body, thereby completely eradicating an electric leakage accident that the human body gets an electric shock and dies.

Description

technical field [0001] The invention relates to the technical field of leakage protection, in particular to a leakage protection device. Background technique [0002] In old-fashioned circuits, zero-sequence protection is used as the leakage protection of the circuit to prevent fires and other accidents caused by circuit leakage. However, the protection setting value of zero-sequence protection is greater than the sum of three-phase unbalanced current, harmonic current and normal leakage current. , so it is impossible to protect the leakage accident caused by electric shock to the human body. [0003] The traditional leakage protection circuit, the leakage frequency increases with the increase of power, the leakage is sensitive, and the malfunction is frequent, not only does not directly play the role of current limiting protection, but also has a large volume and is inconvenient to maintain. [0004] Therefore, it is necessary to provide a new leakage protection device to ...

AI Technical Summary

Problems solved by technology

[0002] In old-fashioned circuits, zero-sequence protection is used as the leakage protection of the circuit to prevent fires and other accidents caused by circuit leakage. However, the protection setting value of zero-sequence protection is greater than the sum of three-phase unbalanced current, harmonic current and normal leakage current. , so it is impossible to protect the leakage accident caused by electric shock to the human body

[0003] In the traditional leakage protection circuit, the leakage frequency increases with the increase of power, the leakage is sensitive, and the malfunction is frequent. Not only does it not directly play the role of current limiting protection, but also it is large in size and inconvenient to maintain.

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