Online setting method and device for characteristic threshold value of leakage current

A leakage current and threshold technology, which is applied in the direction of measuring devices, fault locations, and measuring electrical variables, can solve the problem that the leakage current threshold cannot change with environmental changes, and achieve accurate criterion conditions and accurate threshold intervals.

Pending Publication Date: 2021-10-26
CHINA ELECTRIC POWER RES INST +1
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Problems solved by technology

[0004] In order to overcome the above defects, the present invention is proposed to provide an online setting method and device for leakage current characteristic thresholds that solve or at least partially solve the technical problem that the preset leakage current threshold cannot change with environmental changes

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  • Online setting method and device for characteristic threshold value of leakage current
  • Online setting method and device for characteristic threshold value of leakage current
  • Online setting method and device for characteristic threshold value of leakage current

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Embodiment approach

[0075] Further, based on the above scheme, the present invention provides an optimal implementation mode, specifically as follows:

[0076] (1) Obtain the original sample data of the real-time leakage current amplitude recorded over a period of time {X i ,i=1,2,…N}, let the maximum value be X max , the minimum value is X min ;

[0077] (2) Arrange the original sample data of the leakage current amplitude in a period of time from large to small, and divide L gray levels according to the leakage current amplitude, and the gray level uses gray value j=1,2 ,...L said;

[0078] (3) order Statistics fall in [(j-1)d x ,jd x ] The number of leakage current samples in the range n j , N=n 1 +n 2 +… n L ;

[0079] (4) Calculate the probability of occurrence of gray value j as

[0080] (5) Set the threshold kd x , divide the original sample sequence into two categories: C 0 Indicates that the range is in [0, kd x ] in the value; C 1 Characterization range in [(k+1)d x ...

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Abstract

The invention relates to the technical field of power distribution network equipment operation state analysis, particularly provides a leakage current characteristic threshold value online setting method and device, and aims to solve the technical problem that a preset leakage current threshold value cannot change along with environment change. The method comprises the following steps: dividing gray levels of leakage current amplitude sample data, and calculating a sample probability corresponding to each gray level; selecting a plurality of threshold values, and dividing the leakage current amplitude sample data into two groups based on each threshold value; calculating the variance between each two groups based on the sample probability corresponding to each gray level; and taking two groups of corresponding thresholds with the maximum variance as the characteristic thresholds of the leakage current of the cable line of the power distribution network. According to the scheme, a judgment basis and a measurement standard are provided for realizing online insulation state monitoring analysis and judgment in actual operation of power distribution network equipment.

Description

technical field [0001] The invention relates to the field of analyzing the operating state of distribution network equipment, in particular to an online setting method and device for leakage current characteristic thresholds. Background technique [0002] Leakage current is one of the important characteristics reflecting the insulation status of distribution network cables, and the characteristic threshold of leakage current is the quantitative basis for judging the insulation status. However, the current characteristic threshold setting of leakage current usually relies on test detection or operator experience for off-line tuning and setting. [0003] In the actual operation stage, the leakage current will vary with the actual operating conditions, operating environment and load level of the power grid. If the preset leakage current threshold cannot be changed accordingly, it will inevitably lead to misjudgment of the cable insulation state. Therefore, there is an urgent n...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08G01R31/52G01R35/00
CPCG01R31/086G01R31/52G01R35/005
Inventor 张瑜宋晓辉盛万兴孟晓丽李建芳高菲李雅洁赵珊珊徐冬杰
Owner CHINA ELECTRIC POWER RES INST
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