Impact of temperature on surface charges accumulation on insulator in gas insulated systems under DC voltage stresse

With this expected future advance of HVDC, the use of gas insulated transmission lines (GIL) for dc application are getting increasingly interesting. For now, the problem of surface charge accumulation on gas-insulator interface is one of the critical factors for the development of DC-GIL. In many previous works, the characteristics of surface charges accumulation on insulator was investigated. However, the impact of temperature was neglected in most studies. In fact, a heating phenomenon is known to occur in transmission channel. Due to the surface charge accumulation is closed to the conductivity of insulator and insulated gas, and the conductivity of insulated materials are influenced deeply by temperature. Thus, this paper describes an experimental setup with the ability to simulate the heat transfer progress in DC-GIL, for measuring surface charge of insulator. It is hoped to study the impact of temperature on surface charge accumulation on insulator in future work.