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Applications of Insulating Materials
Release time:
2019-05-14 17:36
The function of insulating materials is to isolate the charged parts with different potentials in electrical equipment. Therefore, insulating materials should first have high insulation resistance and withstand voltage, and avoid accidents such as leakage and breakdown. Secondly, they should have good heat resistance to avoid aging and deterioration due to long-term overheating; in addition, they should also have good thermal conductivity, moisture resistance and lightning protection, high mechanical strength, and convenient processing. According to the above requirements, the performance indicators of commonly used insulating materials include insulation strength, tensile strength, specific gravity, expansion coefficient, etc.
The insulating materials commonly used by electricians can be divided into inorganic insulating materials, organic insulating materials and mixed insulating materials according to their chemical properties. Commonly used inorganic insulating materials include: mica, asbestos, marble, porcelain, glass, sulfur, etc., which are mainly used for winding insulation of motors and electrical appliances, bottom plates and insulators of switches, etc. Organic insulating materials include: shellac, resin, rubber, cotton yarn, paper, hemp, rayon, etc., which are mostly used to make insulating varnish, covering insulation of winding wires, etc. Mixed insulating materials are various shaped insulating materials made by processing the above two materials, which are used as bases, shells, etc. of electrical appliances.
