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Method for realizing weak surface hydrophobicity for alternating-current (AC) composite insulator

A technology of composite insulators and weak hydrophobicity, which is applied in the direction of coating, etc., can solve the problems of weak hydrophobicity and achieve the effect of shortening the string length and reducing the size of the tower

Active Publication Date: 2013-10-09
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no relevant report on the simulation of the weak hydrophobicity (HC6) that will appear in AC composite insulators during operation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The particle size distribution is 4μm when the cumulative particle size transmittance is 16%, 6.5μm when 50%, and 10μm when 84%. Mix 1g of diatomite with 10g of kaolin as an inert substance, NaCl1.1g, add deionized water and mix Evenly, the dirty liquid is prepared.

[0025] Apply the prepared dirty liquid to a dry and clean surface area of ​​11000cm with a uniform brushing method 2 On the surface of the composite insulator, in order to obtain a uniform salt density of 0.1mg / cm 2 , Ash density is 1.0mg / cm 2 surface layer.

[0026] The hydrophobic migration time after drying is 24 hours, and the measured 50% flashover voltage of the composite insulator is 40% higher than the 50% flashover voltage under hydrophilic conditions.

Embodiment 2

[0028] The particle size distribution is 4μm when the cumulative particle size transmittance is 16%, 6.5μm when 50%, and 10μm when 84%. Mix 1g of diatomite with 10g of kaolin as an inert substance, NaCl2.75g, add deionized water and mix Prepare the dirty liquid evenly.

[0029] Apply the prepared dirty liquid to a dry and clean surface area of ​​11000cm with a uniform brushing method 2 On the surface of the composite insulator, in order to obtain a uniform salt density of 0.25mg / cm 2 , Ash density is 1.0mg / cm 2 surface layer.

[0030] The hydrophobic migration time after drying is 24 hours, and the measured 50% flashover voltage of composite insulators is 35% higher than that under hydrophilic conditions.

Embodiment 3

[0032] The particle size distribution is 4μm when the cumulative particle size transmittance is 16%, 6.5μm when 50%, and 10μm when 84%. Mix 1g of diatomite with 10g of kaolin as an inert substance, NaCl3.85g, add deionized water and mix Prepare the dirty liquid evenly.

[0033] Apply the prepared dirty liquid to a dry and clean surface area of ​​11000cm with a uniform brushing method 2 On the surface of the composite insulator, in order to obtain a uniform salt density of 0.35mg / cm 2 , Ash density is 1.0mg / cm 2 surface layer.

[0034] The hydrophobic migration time after drying is 24 hours, and the measured 50% flashover voltage of the composite insulator is 28% higher than the 50% flashover voltage under hydrophilic conditions.

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Abstract

The invention discloses a method for realizing weak surface hydrophobicity (HC6) for an alternating-current (AC) composite insulator. According to the method, diatomite and kaolin are mixed according to a certain ratio and then are coated on the surface of the insulator, and the weak surface hydrophobicity for the composite insulator is realized after a certain migration time. By using the method, the voltage of the AC composite insulator is higher than that of flashover under hydrophilic conditions and is far lower than that of the flashover under strong hydrophobic conditions, and the situation that the hydrophobicity of the composite insulator of an AC transmission line during operation is lowered is better simulated. Thus, AC composite insulator contamination tests are carried out by using the method, and obtained results are applied to the design of external insulation of a power transmission line, so that the construction cost of the power transmission line can be reduced while the reliability of the external insulation of the power transmission line is guaranteed.

Description

【Technical field】 [0001] The invention belongs to the technical field of high-voltage test of power system insulators, and in particular relates to a method for realizing weak hydrophobicity on the surface of an AC composite insulator. 【Background technique】 [0002] Insulators are widely used in power system transmission lines and substation equipment, but after running for a certain period of time, the surface is dirty, and under the influence of fog, dew, drizzle and other climatic conditions, it may occur along the wet and dirty insulating surface. Dirty flashover. The insulator flashover accident caused by pollution (hereinafter referred to as pollution flashover) has now taken the second place in the total accidents of the power grid, second only to the lightning damage accident, but the loss caused by the flashover accident is 10 times that of the lightning damage. Therefore, it is very necessary to carry out the artificial pollution test of transmission line insulat...

Claims

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Application Information

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IPC IPC(8): C09D1/00C09D5/00
Inventor 于昕哲周军刘博宿志一黄瑞平
Owner STATE GRID CORP OF CHINA
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