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A method for testing the hydrophobicity of composite insulators

A technology of composite insulators and detection methods, applied in the direction of testing dielectric strength, etc., can solve the problems of large randomness and dispersion of time-domain changes in leakage current, lack of unified definition methods and evaluation standards, etc., to facilitate operation and diagnosis, improve comparable Performance and accuracy, detection safety effect

Inactive Publication Date: 2016-08-17
TIANJIN UNIV
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Problems solved by technology

[0009] The leakage current runs through the insulator all the time. Although it can reflect the dynamic characteristics of the insulator surface and is convenient for online detection, due to the large randomness and dispersion of the time-domain changes of the leakage current of different types of insulators in different environments, there is currently no Unified definition method and evaluation criteria
[0010] To sum up, due to the complexity of composite insulator material structure and its influencing factors, the hydrophobicity detection and aging evaluation of composite insulators are still in the stage of development and improvement, and the methods of static contact angle, HC grade and leakage current are different in different fields. There are shortcomings and deficiencies

Method used

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  • A method for testing the hydrophobicity of composite insulators
  • A method for testing the hydrophobicity of composite insulators
  • A method for testing the hydrophobicity of composite insulators

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Embodiment

[0055] Implementation example: Using the above experimental steps, the gray histogram of the ultraviolet image of the surface droplet-induced discharge obtained by measuring 4 composite insulator samples with different operating times is as follows: Figure 4 As shown, its specific acquisition method is calculated as formula (1):

[0056] A n = Σ i Σ j I i j - - - ( 1 )

[0057] Among them, An is the statistic of a certain gray value, when the gray value of the pixel point in row i and column j is n, the value of Iij is 1; when the gray value of pixel point in row i and column j is not When it is n, the value of Iij is 0.

[0058] Finally, the characteristic parameters of the gray histogram are quantitatively calcul...

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Abstract

The invention provides a method for hydrophobicity detection and aging evaluation of a composite insulator based on the ultraviolet optical characteristics of liquid drop electric discharge. According to the method, on the premise that safe operation of electric transmission and transformation equipment is guaranteed, the ultraviolet optical characteristics of liquid drop electric discharge on the surface of the composite insulator are effectively obtained and are used for reflecting the existing state and the distribution of the surface liquid drop of the composite insulator and the aging condition of the composite insulator, a corresponding aging evaluation basis is provided, hydrophobicity lowering factors causing an external insulation flashover accident can be detected and judged early, the definition and the accuracy of the surface hydrophobicity detection of the composite insulator are improved, and the continuity and the reliability of power supply and distribution of a power system are effectively guaranteed.

Description

technical field [0001] The invention relates to a detection method for the external insulation of power transmission and transformation equipment in a power system, in particular to a detection method for the hydrophobicity of a composite insulator based on the ultraviolet optical characteristics of droplet discharge. Background technique [0002] Due to its superior electrical performance and high economic benefits, composite insulators have been increasingly widely used in power transmission and transformation equipment in power systems, and have also become an important factor affecting the safe and stable operation of power grids. Compared with traditional ceramic insulators, composite insulators in operation generally show different degrees of aging, which leads to a decrease in hydrophobicity and affects insulation performance. Therefore, carrying out hydrophobicity detection and aging evaluation of composite insulators is one of the important ways to ensure the reliab...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/12
Inventor 刘勇杜伯学高宇李忠磊李杰
Owner TIANJIN UNIV
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