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Insulator is a special insulation control plays an important role in overhead transmission lines. Early years insulators used for poles, slowly developed in the high-voltage wires hang up one end of a lot of disk-shaped insulator, it is in order to increase the Creepage distance, usually made from glass or ceramic, called insulators. Insulators should not environmental-load conditions change and various electrical and mechanical stresses caused by failure or insulators would not have a significant role, it will damage the use and life of the whole line.