Influence of Insulation Material Parameters of Large Hydro-generator on Electric Field Distribution and Potential Distribution at the End of Stator Bar

Stator winding of large motors are usually coated with multi-stage anti-corona on the end insulation surface to solve the corona discharge problem. The conductivity parameter coordination of semi-conductive anti-corona on the insulating surface of the winding outlet has great significance. A 3D finite element model of a three-segment nonlinear corona protection structure was established by COMSOL. The influence of insulation material parameters on the distribution of surface potential and electric field at the stator winding was simulated.