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Development And Application Of Composite Insulators

Nov. 27, 2018

In order to improve the mechanical strength, insulation strength and flashover resistance of insulators, improve production efficiency and reduce costs, overcome the inherent shortcomings of electric porcelain and glass insulators, and adapt to the development of power systems, all countries in the world have begun to develop high-molecular organic materials. Composite Insulator, used to replace traditional electric porcelain and glass insulators. Since the emergence of high-voltage transmission lines at the end of the 19th century, porcelain insulators have been used in the field of high-voltage external insulation for more than 100 years. With the increase of voltage levels, the load on the insulators is aggravated, and the air pollution is intensified. A performance defect is exposed. The use of composite insulators compensates for the defects and weaknesses of porcelain insulators.

As early as the mid-1940s, bisphenol epoxy insulators began to be used for indoor insulation. The insulator is light in weight, strong in impact resistance, and easy to process into a composite insulation structure. However, due to its aging resistance, resistance to electric leakage and pitting corrosion resistance, it cannot be used outdoors. In the 1950s, better-performing alicyclic resin insulators appeared. In the early 1960s, a small number of such insulators were operated on 400kV transmission lines and 500kV power stations. In the late 1960s and early 1970s, Europe and the United States began manufacturing polymer insulators for transmission lines. Among many polymers, high-temperature vulcanized silicone rubber is superior to other materials such as ethylene-propylene rubber in aging resistance and harsh environment, and has been widely used.

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