Characteristics of surface potential of disc spacers under different temperature

The problem of surface charge accumulation on gas-insulator interface is one of the critical factors for the insulation of DC-GIL. A GIL experiment platform which can heat central electrode with variable temperature is built to investigate the surface charge under different temperature. The surface potentials of insulator at different temperature under negative voltage are measured and the effect of temperature on the non-uniformity of potential distribution is discussed. The average potential at 70 °C is 231% higher than that at 30 °C. These data can be referred in the insulation design of DC-GIL.