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Aging state classification and discrimination method of composite insulators

A composite insulator, aging state technology, applied in the direction of instruments, measuring devices, measuring electricity, etc., can solve the problem of too many subjective factors, not involving mathematical models and methods, etc.

Active Publication Date: 2019-08-02
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Claims
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Problems solved by technology

[0003] So far, the classification of the aging state of composite insulators has mainly focused on appearance inspection, hardness, and degree of hydrophobicity loss. The main disadvantage is that there are too many subjective factors, and it does not involve mathematical models and methods.

Method used

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  • Aging state classification and discrimination method of composite insulators
  • Aging state classification and discrimination method of composite insulators
  • Aging state classification and discrimination method of composite insulators

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Embodiment Construction

[0049] The present invention proposes a method for grading and judging the aging state of composite insulators based on thermally stimulated current, which will be described below in conjunction with the accompanying drawings and embodiments.

[0050] Cluster analysis method is used to select the average value of the lost static contact angle X1, the minimum value of the lost static contact angle X2, the average value of the recovered static contact angle X3 of the hydrophobicity recovery test, and the trapping charge of the thermally stimulated current (TSC) in the hydrophobicity loss test The five variables of X4 and trap energy level X5 quantify and grade the aging state of 18 samples; and use the discriminant analysis method to discriminate the three unknown aging state samples to obtain the discriminant function of each aging level; among them, the discriminant standard is based on the trap The size of the charge is given by the cluster analysis results, and the accuracy o...

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Abstract

The invention discloses a classification and discrimination method of the aging state of a composite insulator, and belongs to the technical field of high voltage and insulation. According to the method, a cluster analysis method is employed, quantitative classification of the aging state of 18 samples is performed by selecting five variables: a loss static contact angle mean value X1 and a loss static contact angle minimum value X2 of a hydrophobic loss test, a recovery static contact angle mean value X3 of a hydrophobic recovery test, and a trap charge X4 and a trap energy level X5 of a thermal stimulated current (TSC); 3 samples with unknown aging states are discriminated via a discriminant analysis method, and a discrimination function of each aging grade is obtained; and the discrimination standard is given by a cluster analysis result according to the trap charge, and the accuracy of an aging state classification result is verified via the discriminant analysis method. According to the method, the aging degree of polymer materials can be determined via the measurement of the trap charge, and various losses due to accidents can be avoided.

Description

technical field [0001] The invention belongs to the technical field of high voltage and insulation. In particular, it relates to a method for grading and judging the aging state of composite insulators, Background technique [0002] Composite insulators are widely used in the insulation of transmission lines in power systems because of their advantages such as high mechanical strength, high pollution flashover voltage, light weight, and simple operation and maintenance. However, due to the influence of the operating environment, including ultraviolet rays, temperature and humidity, pollution and corona, etc., composite insulators will experience varying degrees of aging, mainly in the shed brittleness, pulverization and damage, and even mandrel breakage . Therefore, how to judge the aging state of composite insulators of transmission lines, that is, when to replace composite insulators, has become an urgent problem to be solved by the operation and maintenance department. ...

Claims

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Application Information

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IPC IPC(8): G01R31/00
Inventor 屠幼萍王璁李天福龚博张辉佟宇梁
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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