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Leakage protection method and device

A technology of leakage protection and residual current, which is applied in the direction of emergency protection circuit devices, circuit devices, emergency protection devices with automatic disconnection, etc., can solve problems such as prone to misoperation and inaccurate leakage protection, so as to ensure the safety of electricity use, Elimination of high-frequency signals and harmonic components, and the effect of accurate leakage protection

Active Publication Date: 2011-01-26
吕纪文
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Problems solved by technology

[0006] The embodiment of the present invention provides a leakage protection method and device, which are used to solve the problems of inaccurate leakage protection and prone to misoperation in the prior art

Method used

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  • Leakage protection method and device

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Embodiment Construction

[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0038] Such as figure 1 Shown is a flow chart of a leakage protection method according to an embodiment of the present invention.

[0039] Including step 101, collecting the residual current signal output by the zero-sequence transformer in the power supply circuit, wherein the residual current means that when an accident occurs on the side of the electrical appliance, the current flows from the charged body through the human body to the earth, causing the main cir...

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Abstract

The invention relates to the field of electrical safety and provides a leakage protection method and a leakage protection device, which are used for solving the problems of inaccurate leakage protection and high probability of misoperation in the prior art. The method comprises the following steps of: acquiring a residual current signal input by a zero sequence mutual inductor in a power supply circuit; performing analog to digital (A / D) conversion and digital filtering on a residual current so as to eliminate interference signals, and calculating the amplification change rate of the residualcurrent; and disconnecting the power supply circuit if the amplification change rate of the residual current exceeds a first threshold value. The embodiment of the invention has the advantages of more accurately performing leakage protection and monitoring, and improving the reliability of normal work of a power supply system on the premise of ensuring electrical safety.

Description

technical field [0001] The invention relates to the field of electrical safety, in particular to a leakage protection method and device. Background technique [0002] Many years of operating experience at home and abroad have shown that popularizing the use of leakage protectors has obvious effects on preventing electric shock casualties and fire accidents caused by leakage. [0003] Existing leakage protectors (such as zero-sequence current transformers) basically detect the residual current, directly compare it with the threshold, and judge the leakage according to the comparison result, so as to achieve the purpose of protecting personal and equipment safety. [0004] The inventors of the embodiments of the present invention have found at least the following problems in the prior art, that is, there is a contradiction between dynamic range and sensitivity, that is, a leakage protection device with a larger rated operating current has lower detection sensitivity. This is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H3/32H02J3/01
CPCY02E40/40
Inventor 吕纪文
Owner 吕纪文
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