In the 1980 s, tsinghua university, wuhan institute of hydraulic and electric engineering, with support from the state "seventh plan, composite insulator was developed, two units umbrella skirt material with high temperature vulcanization silicone rubber, epoxy glass hardware and steel reinforced bar connection mode adopted different technical route, tsinghua university, USES a wedge structure. Wuhan institute of water conservancy and electric power USES the outer wedge structure. The scientific and technological achievements of the two schools are transferred to enterprises and converted into productive forces. At first, the power operation department had doubts about the use performance of composite insulators, and was very cautious about the network operation. Only a small number of samples were hung on the unimportant lines with voltage grades below 110 kV for live test. Born in 1990 in north China, a wide range of serious pollution flashover accident trial showed excellent composite insulator pollution flashover resistance ability, are popular unit of electric power operation, many departments take the initiative to adopt the new technology, expand the scale and scope commissioning, greatly improving the transmission, distribution circuit of pollution flashover resistance ability, and reduce the workload of cleaning line road, therefore welcomed by electric power operation unit. After several years of operation assessment, the power authority affirmed that composite insulator is a new anti-pollution flashover technology, and began to apply in the voltage grade above 110kV.
Early in the use of composite insulator, the electric power operation departments in the use of composite insulator on the transmission line 500 kV voltage grade a prudent attitude, with particular emphasis on operating experience, and from the United States, Germany imported a number of composite insulator composite insulator manufacturer hang net operation, domestic run of 500 kV composite insulator were established screening. After more than ten years of testing, the operation practice shows that the quality of domestic composite insulators is not inferior to that of imported ones.
In the composite insulator development, technology, materials, test method, aging problems, mechanical properties, brittle fracture problems, umbrella group cutting, high altitude problems. Researchers in the field of composite insulators have done a lot of continuous research, which provides solid technical support for the development and quality assurance of composite insulators in China