A method for judging the aging degree of rtv materials

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...

AI Technical Summary

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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