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A method for judging the aging degree of rtv materials

A technology of aging degree and change rate, which is applied in the direction of analyzing materials, instruments, measuring devices, etc., can solve the problems of judging pollution flashover voltage, the degree of aging of RTV paint is not very reliable, and the degree of coating integrity is not the same, so as to achieve simple operation Effect

Active Publication Date: 2017-03-01
STATE GRID CORP OF CHINA +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Some domestic units have studied the aging of RTV coatings by measuring the artificial pollution tests of insulators with different operating times and different products. The test results show that the leakage current and pollution flashover voltage of products produced by different manufacturers and operated for different years under the same pollution conditions There is a large difference, and there is also a point of view that the pollution flashover resistance of insulators with RTV coatings is lost year by year, and the degree of aging and service life can be inferred according to the degree of loss, but this method does not seem to be appropriate, because the climate of different regions The environment is different, the configuration of the external insulation is also different, and the integrity of the coating will vary with the change of the maintenance situation.
Therefore, the method of estimating the lifetime simply based on the pollution flashover voltage of RTV coated insulators needs to be explored; in addition, the relationship between the leakage current and the pollution flashover voltage has not yet been determined, and it is difficult to directly judge the pollution flashover voltage from the leakage current Case
Therefore, it is not very reliable to judge the aging degree of RTV paint by leakage current.

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  • A method for judging the aging degree of rtv materials
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  • A method for judging the aging degree of rtv materials

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Embodiment Construction

[0031] The method for judging the RTV aging degree of the present invention will be described in detail below with specific embodiments.

[0032] refer to figure 1 As shown, the hydrophobicity of the RTV surface is eliminated by using dielectric barrier discharge. Dielectric Barrier Discharge (DBD) is a non-equilibrium gas discharge in which an insulating medium is inserted into the discharge space, also known as dielectric barrier corona discharge or silent discharge. Dielectric barrier discharge can work in high pressure and wide frequency range, the usual working pressure is 10~10000. The power supply frequency can be from 50Hz to 1MHz. There are various designs of electrode structures. Fill some kind of working gas between the two discharge electrodes, and cover one or both electrodes with an insulating medium, or hang the medium directly in the discharge space or fill it with a granular medium, when enough is applied between the two electrodes When the AC voltage is h...

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Abstract

The invention discloses a method for judging the ageing degree of RTV (Room Temperature Vulcanization) materials. The method comprises the following steps: (1) preparing an RTV sample and eliminating the surface hydrophobicity; (2) measuring water drops of a solution by RTV sample titration amounts at different moments and measuring a static contact angle; (3) drawing a static contact angle-time curve and solving analysis characteristic quantity; and (4) judging the ageing degree of the RTV materials according to the analysis characteristic quantity. The method for judging the ageing degree of the RTV materials can be used for accurately and reliably judging the ageing degree of the RTV materials, is simple to operate, and is applicable to large-range popularization and utilization.

Description

technical field [0001] The invention relates to the field of high-voltage external insulation, in particular to a method applicable to judging the aging degree of RTV materials. Background technique [0002] With the rapid development of the modern economy and the increasing demand for electricity, the power system has developed into a structure of large grids and long-distance high-voltage transmission. Air pollution caused by traditional chemical, coal, cement, steel and other heavy industries has led to transmission Pollution flashover accidents of electrical equipment have increased. The pollution flashover of insulators is determined by two factors, one is the surface pollution of insulators caused by air pollution; the other is the meteorological conditions that can fully absorb the accumulated pollutants. Insulators with dirty surfaces still have high dielectric strength under dry weather conditions. However, under the meteorological conditions such as heavy fog, co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N17/00
Inventor 陈杰周志成刘洋朱孟周赵晨龙
Owner STATE GRID CORP OF CHINA
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