Application of identification methods for predicting the flashover voltage of contaminated insulators covered with ice

The arc characteristics on contaminated insulator surfaces covered with ice were investigated. The arc constants (A, n), as well as the ac re-ignition parameters (K, b) were determined using a simplified cylindrical physical model. Based on identification methods, a new approach for calculating the residual voltage is introduced. These results will serve to extend the previous mathematical model developed at CIGELE for its application to predicting the flashover voltage of contaminated insulators covered with ice. The model was successfully applied to a five-unit IEEE standard insulator string, and the calculated results were in good agreement with the experiments.