According to the core fracture of composite insulator on the 500kV power line of CSPG and the temperature abnormal rise of composite insulator which the numbers are 25,38,and 42on No.5123 tower Xuyang power line of Shanghai power company of SGCC, these composite insulator have been done test about appearance inspection, hydrophobicity, material check and mechanical strength and etc.

The results of test show that the hydrophobicity is well and the material of silicon shed of composite insulator isn’t aging. But there are some humps on the surface of housing and erosion on the interface between whole housing and core of composite insulators. The penetrant (1% fushine) appear on the interface between housing and core. The erosion had extended from high voltage to the middle part of composite insulator. One of the reasons about erosion on the interface between housing and core of composite insulator is mold releasing agent from core. The crack between housing and core has been made by the mold releasing agent and the partial discharge has appeared. The water which is absorbed on the production of core has taken part in electrochemical reaction leading to erosion.

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