Research on the Silicone Rubber Sheds Performance of Composite Insulator

Ten 220 kV/66 kV composite insulators were selected to study the performance of silicone rubber sheds, which were utilized different time in the northeast of China, the hydrophobicity, loss-recovery-transference of hydrophobicity, the shore hardness, the tensile, tearing, volume resistivity and dielectric strength of silicone rubber were determined. The test results indicated that there is no obvious aging apparent of hydrophobicity characteristic of silicone rubber, hydrophobicity of composite insulators with natural contamination is better; the loss-recovery-transfer of hydrophobic descend to some extent with the increasing of operation time, and the mechanical property of the sheds material with long operation time descend evidently, the Shore hardness of material meets to the criterion demand, which has no relation with operation time, the material volume resistivity present to high performance, but material dielectric strength is lower, which has no relation with operation time.