Silicone rubber insulating material hydrophobicityhydrophobicity transfertestingmethod

Abstract

The invention relates to a silicone rubber insulating material hydrophobicity transfer testing method, and the technology of the methodis characterized in that: obtaining dirt capable of accurately representing surface state of an insulator in the field; carrying out a pretreatment for insulator surface dirt obtained on the spot ofa laboratory, removing comparatively large particles in the dirty, andtaking dirt of a specific weight; pouring a certain amount of distilled water into a measuring cup and uniformly spreading the dirt of the specific weight on the surface of water in the measuring cup and timing, and recording a dirt wetting time till all the dirt is wetted by distilled water and sinks to the bottom of the measuring cup; determining a hydrophobicity transfer grade of theinsulator surface according to the wetting time of dirt. The invention has a reasonable design,insulators during operation are not needed to be pickeddown, thereby reducing workload and safety risk during test. The test equipment in use is simple, only a timer, an electronic weighing device, a measuring cup and distilled water are needed. Compared with atraditional test method (water spray grading method), the test result has a good consistency and is credible.

Description

technical field [0001] The invention belongs to the technical field of testing the hydrophobic mobility of silicone rubber, in particular to a method for testing the hydrophobic mobility of silicone rubber insulating materials. Background technique [0002] Pollution flashover of external insulation has always been a major threat to the safe operation of power systems. Silicone rubber composite insulators and RTV antifouling flashover coatings exhibit excellent antifouling properties due to their hydrophobic mobility, and are widely used in my country's power grids. However, as the running time increases, the gradual aging of the silicone rubber material and the continuous deposition of dirt will reduce or even lose the hydrophobicity of the insulator surface, directly resulting in a significant drop in its pollution resistance. Therefore, the hydrophobic mobility of composite insulators and RTV coatings, which have been in operation for many years, is a key parameter for s...

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Problems solved by technology

[0003] At present, the water-spray classification method (HC classification method) and the static contact angle method are mainly used to test the hydrophobic mobility of the surface of silicone rubber insulating materials. The idea of ​​these two methods is to contact a small amount of water with a large area of ​​pollution. The degree of compatibility between the two substances can be used to judge the strength of hydrophobic migration. However, the above two methods need to remove the dirty running insulator from the line and send it to the laboratory for testing. On the one hand, it will affect the normal operation of the power grid. On the other hand, the process of removing insulators also brings high safety risks

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