Under the condition simulated by ultrasonic saline fog generator, effects of environmental relative humidity and saline fog conductance on the leakage current of silicone rubber insulator with high voltage DC electric field is studied.

In view of the Liu-San-Li line which used some overhead line new products such as the insulated conductor, the organosilicon rubber compound insulator,this article analysises and discusses their application and existence some questions in Zhongyuan Oil-field electrical network.

With implementation of the western development Strategy as well as UHV projects,more and more silicone rubber composite insulators have been used in high-altitude regions.

Characteristics of UL certification of silicone rubber insulated wires;