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Device for hydrophobicity detection and aging evaluation of composite insulator

A technology for composite insulators and aging assessment, which is applied in the direction of measuring devices, measuring electricity, and measuring electrical variables, etc., can solve the problems of large randomness and dispersion of leakage current time-domain changes, lack of unified definition methods and evaluation standards, etc., to achieve convenient Operate diagnostics, improve comparability and accuracy, and detect safety effects

Inactive Publication Date: 2014-07-23
STATE GRID TIANJIN ELECTRIC POWER
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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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  • Device for hydrophobicity detection and aging evaluation of composite insulator
  • Device for hydrophobicity detection and aging evaluation of composite insulator
  • Device for hydrophobicity detection and aging evaluation of composite insulator

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Embodiment

[0052] 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):

[0053] A n = Σ i Σ j I ij - - - ( 1 )

[0054] 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.

[0055] Finally, the characteristic parameters of the gray histogram are quantitatively calculated by formula (2) and formula...

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Abstract

The invention provides a device for hydrophobicity detection and aging evaluation of a composite insulator based on ultraviolet optical characteristics of liquid drop discharge. On the premise of guaranteeing safe operation of electric transmission and transformation equipment, the ultraviolet optical characteristics of discharge of liquid drops on the surface of the composite insulator are obtained effectively and used for reflecting the existing state and distribution of the liquid drops on the surface of the composite insulator and the aging conditions of the composite insulator, and corresponding aging evaluation criteria are provided. By means of the device, hydrophobicity reducing factors causing external insulation flashover accidents can be subjected to early detection and diagnosis, the resolution and accuracy of surface hydrophobicity detection of the composite insulator are improved, and continuity and reliability of power supply and distribution of an electric power system are effectively guaranteed.

Description

technical field [0001] The invention relates to a detection device for external insulation of power transmission and transformation equipment in a power system, in particular to a composite insulator hydrophobicity detection and aging evaluation device 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 re...

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Application Information

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IPC IPC(8): G01R31/00G01N13/00
Inventor 张奇刘勇冀慧强赵北涛孙云东张昕梁晓虎靳忠杜志敏刘美静邓连波田成凤石伟
Owner STATE GRID TIANJIN ELECTRIC POWER
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