Investigation on distribution of electro-thermal coupling fields influenced by HVDC bushing insulation properties

Bushing is an indispensable component in high voltage direct current (HVDC) transmission project. As the main insulating material possesses poor thermal conductivity and negative temperature coefficient (NTC) electrical resistivity, HVDC bushing suffers from distortion of electro-thermal-coupled fields. Therefore, it urgent to reveal influence resistivity-temperature characteristic on DC electric field distribution within insulation, guiding design application advanced materials. Here, simulation a 400 kV are carried out. The results show that optimization NTC effect able obtain more uniform through homogenizing resistivity insulation. activation energy has similar variation trend with maximum which potential represent dependence It also shows reduction by increasing saturation feature. result, suppression should be considered together smaller bushing. research study provides new idea regulate distribution, beneficial