Study About the Surface Charge Accumulation and Dissipation of Insulators Under Corona Condition

The insulator surface charge buildup issue is a significant element impacting the electric field on the insulator surface in HVDC transmission. The electrostatic probe method is used to measure the surface potential of various insulators under the corona situation in order to acquire insulator surface charge buildup and dissipation regularity under DC high voltage. A charge density inversion approach for curved surfaces is suggested in this study. The chosen measurement points are used to create triangular meshes from the curved surface. Based on the measured potential, surface charge density is inversed. According to the findings, an insulator with a PRTV coating on its surface is easily charged. The surface potential attenuation trend of the insulator shed sprayed with PRTV coating is exponential attenuation. The peak value of insulator shed sprayed with PRTV coating surface charge density is about −0.5μC/m2.