Aging evaluation method for liquid silicon rubber for power station equipment

Abstract

The invention discloses a liquid silicone rubber aging evaluation method for power station equipment, which is used for judging the aging performance of the liquid silicone rubber outer insulating sheath of the power station equipment, including measuring the hydrophobicity of the liquid silicone rubber and measuring the thickness of the pulverized layer , Specular gloss measurement, tracking and electrical erosion performance test, X-ray photoelectron spectroscopy analysis and X-ray diffraction analysis, and the above measurement results are combined to judge the aging state of liquid silicone rubber. The evaluation method of the present invention has a novel detection method, intuitive detection results, and is easy to be grasped by power station maintenance personnel. It can accurately judge the aging state of liquid silicone rubber used in power station equipment that has been in operation for many years, and evaluate the outer insulating sheath of power station equipment. Whether it can persist in operation, repair or replacement effectively promotes the safe and stable operation of the power system.

Description

technical field [0001] The invention relates to the field of repair and maintenance of power station equipment, in particular to a liquid silicone rubber aging evaluation method for power station equipment. Background technique [0002] Liquid silicone rubber is a relatively high-grade silicone rubber developed since the 1970s. It is cross-linked by the addition reaction of vinyl siloxane and silicon hydrogen group. It has small molecular weight, low viscosity and easy processing. Molding can be vulcanized at room temperature, or can be accelerated by increasing the temperature. Compared with condensation silicone rubber, it also has the characteristics of deep vulcanization, no by-products, and small shrinkage. Liquid silicone rubber has low viscosity, good fluidity, fast vulcanization, and can be poured or injected. It has been widely used as the outer insulating sheath of composite insulators, transformers, wall bushings, DC voltage dividers, and lightning arresters. It ...

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Problems solved by technology

[0003] During long-term grid-hanging operation, the liquid silicone rubber used as the outer insulating sheath will age due to high-intensity electric fields and the effects of light, heat, rain, and pollution in the environment, resulting in a decrease in the hydrophobicity of the outer insulating sheath of power station equipment. , Shed discoloration, hardening and brittleness, pulverization, cracking, tracking or electrical corrosion, end seal failure, etc., seriously affect the safe operation of power station equipment