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A non-contact detection method for the pollution degree of composite insulators

A composite insulator and detection method technology, which is applied in the field of maintenance of power transmission and transformation equipment, can solve the problems of unsuitable detection of pollution degree, high cost, heavy workload of equivalent salt density method, etc.

Active Publication Date: 2018-05-01
STATE GRID CORP OF CHINA +2
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The equivalent salt density method has a large workload and is greatly affected by human factors; the voltage distribution method is sensitive to the properties and defects of the insulator, and is not suitable for detecting the degree of pollution; the leakage current method detects the pollution of composite insulators by measuring the change of the leakage current degree, the leakage current measurement method is affected by factors such as voltage level, composite insulator model, environment, etc., and cannot accurately reflect the degree of deterioration of the composite insulator, and pollution flashover often occurs when the leakage current changes suddenly, and the detection cost is high; infrared thermal image temperature measurement method It can detect the local temperature rise of the insulator caused by the dielectric loss or resistance loss when the partial discharge leakage current flows through the insulating material, but the cost of the instrument is high, and the temperature measurement is affected by factors such as the sun, wind, and atmospheric environment. It is sensitive to structural defects, but has no obvious effect on the pollution of porcelain insulators

Method used

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  • A non-contact detection method for the pollution degree of composite insulators

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Experimental program
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Effect test

Embodiment 1

[0023] In step 3, first, classify the pollution level of the umbrella skirt to obtain three kinds of pollution levels of the umbrella skirt, which are respectively level 1, level 2, and level 3;

[0024] Then, calculate the pixel area corresponding to each pollution level, the pixel area of ​​pollution level 1 is 120, the pixel area of ​​pollution level 2 is 100, and the pixel area of ​​pollution level 3 is 600;

[0025] Finally, taking the maximum value of s1, s2, s3, ..., sn as sa is 600, the corresponding pollution level ta is level 3, the maximum value t in the pollution level is level 3, and the corresponding pixel area s is 600, Since s / (s1+s2+...+sn)=600 / 820≥0.5, ta is taken as the pollution level of the composite insulator, which is level 3.

Embodiment 2

[0027] In step 3, first, classify the pollution level of the umbrella skirt to obtain three kinds of pollution levels of the umbrella skirt, which are respectively level 1, level 2, and level 3;

[0028] Then, calculate the pixel area corresponding to each pollution level, the pixel area of ​​pollution level 1 is 120, the pixel area of ​​pollution level 2 is 600, and the pixel area of ​​pollution level 3 is 100;

[0029] Finally, take the maximum value sa among s1, s2, s3, ..., sn to be 600, the corresponding pollution level ta is level 2, the maximum value t in the pollution level is level 3, and the corresponding pixel area s is 100, because s / (s1+s2+...+sn)=100 / 8200.5, then take the pollution level ta as the pollution level of the composite insulator, that is for level 2.

Embodiment 3

[0031] In step 3, first, classify the pollution level of the umbrella skirt to obtain three kinds of pollution levels of the umbrella skirt, which are respectively level 1, level 2, and level 3;

[0032] Then, calculate the pixel area corresponding to each type of pollution level, the pixel area of ​​pollution level 1 is 220, the pixel area of ​​pollution level 2 is 320, and the pixel area of ​​pollution level 3 is 280;

[0033] Finally, take the maximum value among s1, s2, s3, ..., sn as sa, which is 320, the corresponding pollution level is ta as level 2, the maximum value t in the pollution level is level 3, and the corresponding pixel area s is 280, Since s / (s1+s2+…+sn)=280 / 820<0.5, further calculation of sa / (s1+s2+…+sn)=320 / 820<0.5 will be based on the proportion of the pixel area of ​​each pollution level The value summed for the weight is taken as the pollution level of the composite insulator, that is, (220 / 820)*1+(320 / 820)*2+(280 / 820)*3≈2 levels.

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Abstract

The invention provides a non-contact detection method for the pollution degree of composite insulators, including step 1, collecting composite insulator information, and extracting target areas; step 2, determining the pollution levels corresponding to target objects in the target area; step 3, according to the The pollution level of the target object is used to determine the type of pollution, and each type of pollution corresponds to a reference factor, and the pollution level of the composite insulator is determined by the criteria met by the reference factor. The method is convenient for collecting information and the method of calculating the pollution level is reasonable, so it is a method for detecting the pollution level of composite insulators with wide application range, little external interference, and low cost. The method can be used to detect the composite insulator without touching it, and the pollution degree of the composite insulator can be known at all times, so that the pollution flashover risk of the insulator can be warned and the safe operation of the power grid can be protected.

Description

technical field [0001] The invention belongs to the field of operation state maintenance of power transmission and transformation equipment, and in particular relates to a non-contact detection method for the pollution degree of composite insulators. Background technique [0002] In recent years, the damage and pollution flashover accidents of composite insulators have increased, and the equivalent salt density method, voltage distribution method, leakage current method, and infrared temperature measurement method are commonly used to detect the pollution degree of composite insulators. [0003] The equivalent salt density method has a large workload and is greatly affected by human factors; the voltage distribution method is sensitive to the properties and defects of insulators, and is not suitable for detecting the degree of pollution; the leakage current method detects the pollution of composite insulators by measuring the change of leakage current The leakage current mea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/94
Inventor 向文祥邵瑰玮王星超张珣刘春堂罗洋沈晓龙刘继承付晶胡霁
Owner STATE GRID CORP OF CHINA