Research On Artficial Contamination Test Of Composite Insulators

Contamination flashover is in the second-highest total of composite insulators' flashover. Home and abroad, extensive flashover test research is carried out, including artificial contamination tests, but no good results are achieved. In recent years, UV imaging technology is more popular and recognized in the power equipment detection. This paper organically linked artificial contamination tests and UV imaging technology together, and developed artificial contamination test equipment of composite insulators, which is based on UV imaging. On this basis, we carried on artificial contamination test based on UV imaging technology and analyzed influenced factors of contamination flashover.First, according to the requirements of insulation strength and UV transmittance, we selected box material of artificial contamination test equipment. With finite element analysis on electric field distribution of composite insulator, we designed the size of artificial contamination test equipment. Then we brought in UV imaging system, humiture charge system, sprinkler system and leakage current test system, and built artificial contamination test equipment based on UV imaging to simulate contamination flashover of composite insulators.In order to study the influenced factors of composite insulators'contamination flashover, we carried on artificial contamination tests of 10kV composite insulators with artificial contamination test equipment, including tests of different temperature, different humiture and different contamination and distribution. Besides traditional records, UV imaging of artificial contamination tests was brought into tests, and was more intuitively studying the occurrence of flashover development. We also used the number of ultraviolet photons as the introduction of contamination flashover of new parameters, so that made new progress in research of insulators'contamination flashover.Through UV-based artificial contamination test, we linked humidity, temperature, salt concentration and other parameters with the number of ultraviolet photons to establish a correspondence between them and analyzed influenced factors and ways to accumulate data and experience for power equipment contigency tests.