Application of Disc Insulators for Electric Power Equipment in Pulse Power Technology

At present, the insulation structures of many gas insulated switchgear (GIS) and gas insulated metal enclosed transmission line (GIL) are mainly disc insulator cooperating with SF6 gas, and the disc insulator has the function of isolating air chamber, supporting conductor and insulating it to the ground. For expending the application of disc insulators, thermal characteristic and dielectric response of materials for disc insulators were measured. The differential scanning calorimeter (DSC) and thermogravimetric analysis (TGA) were employed to measure the melting endotherm process and the thermal stability, and dynamic thermos-mechanical analysis (DMA) was used to record the response of the samples to temperature under shear stress. The surface resistivity was measured by 6517A electrometer. The dielectric response under broadband frequency, especially in the radio frequency range, was measured to analyze the material properties. The experimental results were analyzed comprehensively to discuss the application feasibility of disc insulators in pulse power technology.