Study on the Material Used for On-site Insulation of Bare Overhead Conductors

Distribution network is one of the main parts of the power systems. Currently, the widely used bare overhead transmission line in the distribution work may lead to unwanted accidents. However, the cost of replacing existing bare conductors with new insulated wires is too high. The on-site insulating of bare conductors is a promising solution. To this end, an insulating material that is proper for this application is vital. In this paper, five kinds of insulating materials are compared, and the one-component room temperature vulcanized silicone rubber (RTVSR) is selected. Through the experiments, the best ratio of low and high viscosity α, ω-dihydroxy polysiloxane silicone rubber is obtained. This paper can provide guidelines for the selection of material for on-site insulation of bare conductors and the effect of raw rubber and MQ silicone rubber on the insulating material’s properties.