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Electric shock signal transient component identification method and residual current protection device

An identification method and protection device technology, applied to emergency protection circuit devices, emergency protection devices with automatic disconnection, circuit devices, etc., can solve the problems of inability to truly identify the current signal of the electric shock branch circuit of the human body, failure to close the gate, misoperation, etc. problem, to achieve the effect of improving sensitivity and reliability

Active Publication Date: 2013-01-09
北京创万通伟科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Operation experience shows that most of the current residual current protection devices cannot really identify the current signal of the human body electric shock branch, and often fail to close the gate or put into operation correctly when the load is heavy; or in wet weather conditions, due to the significant insulation level of the electrical circuit Reduced, resulting in an increase in the leakage current to the ground, and then there will be a phenomenon of malfunction

Method used

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  • Electric shock signal transient component identification method and residual current protection device
  • Electric shock signal transient component identification method and residual current protection device
  • Electric shock signal transient component identification method and residual current protection device

Examples

Experimental program
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Effect test

Embodiment 1

[0031] This embodiment provides a residual current protection device, such as figure 1 shown, which includes:

[0032] An extraction unit, configured to extract the real-time monitored total leakage current signal;

[0033] The selection unit is used to select a one-dimensional diamond-shaped structural element, which is determined by the waveform of the electric shock signal, and after a large number of simulations on the signals obtained from the experiment, it is determined to use the diamond-shaped structural element because the diamond-shaped structural element has the best effect.

[0034] The preferred step size is 1, which can not only obtain obvious detection effect, but also meet the requirements of fast operation (the longer the step size, the longer the operation time).

[0035] The mathematical morphology operation unit is used to perform mathematical morphological closing and opening operations on the real-time monitored total leakage current according to the se...

Embodiment 2

[0049] The specific flow of the electric shock signal transient quantity identification method provided by the present invention is as follows: figure 2 shown, including:

[0050] Step 1. Extract the real-time monitored total leakage current signal. Since a signal is described in the time domain, its basic unit is a cycle. In order to ensure the accuracy of the algorithm, a total leakage current signal of one cycle is preferred each time.

[0051] Step 2, performing mathematical morphology opening and closing operations and closing and opening operations on the total leakage current monitored in real time, and making a difference between the results of the closing and opening operations and the opening and closing operations. Among them, the opening and closing operation is defined as: the total leakage current signal and the constructed rhombus structure element are firstly subjected to mathematical morphology opening operation and then the mathematical morphology closing op...

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Abstract

The invention provides an electric shock signal transient component identification method and a residual current protection device corresponding to the method. The residual current protection device comprises an extraction unit, a selection unit, a mathematical morphology operation unit and a control unit, wherein the extraction unit is used for extracting a total leakage current signal monitored in real time; the selection unit is used for selecting a one-dimensional diamond structural element; the mathematical morphology operation unit is used for performing mathematical morphology closing-opening and opening-closing operation on the total leakage current monitored in real time according to the selected one-dimensional diamond structural element to obtain a transient characteristic quantity; and the control unit is used for judging whether the transient characteristic quantity exceeds a predetermined value, if the transient characteristic quantity exceeds the predetermined value, judging that a failure causes and sending out a tripping command, and otherwise, controlling the extraction unit to continuously extract the total leakage current signal monitored in real time. By the method, the current characteristics of an electric shock branch circuit (a human body or an animal) can be identified quickly and effectively, so that the current signals of the electric shock branch circuit of the human body can be identified accurately, and the sensitivity and the reliability of the residual current protection device are improved.

Description

technical field [0001] The invention relates to the technical field of electrical engineering, in particular to a method for identifying transient quantities of electric shock signals and a residual current protection device. Background technique [0002] The residual current protection device plays an important role in preventing personal electric shock and avoiding damage to electrical equipment caused by leakage current in the low-voltage power grid. The action criterion of the commonly used residual current protection device is usually that the amplitude of the total leakage current of the low-voltage power supply circuit is greater than a certain setting value, or the micro-increment of the total leakage current is greater than a certain specified value. Operation experience shows that most of the current residual current protection devices cannot really identify the current signal of the human body electric shock branch, and often fail to close the gate or put into ope...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H3/32
Inventor 苏娟杜松怀关海鸥邵利敏
Owner 北京创万通伟科技有限公司
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