Dynamic calculation of leakage current and electric field of distribution polymeric insulator under pollution layer

This paper presents two different methods to calculate the leakage current (LC) along a 20 kV silicone rubber (SiR) insulator surface. The first method which is based on field theory approach uses the Comsol software to compute the leakage current. The second method is based on Young model. Simulation approach was compared with the circuit theory model which developed by Young. This paper investigates the use of a dynamic pollution model to compute the electric field distribution along the leakage path. Also, the results show that the voltage and electric field distribution along silicone rubber insulator under wet polluted conditions are dependent on the insulator surface conductance and the magnitude of the E-field close to the energized end fitting is higher than the grounded end.