Dynamic arc modeling of pollution flashover of insulators under DC voltage.pdf

IEEE Transactions on Electrical Insulation Vol. 28 No. 2, April 1003 200 Dynamic Arc Modeling of Pollution Flashover of Insulators under dc Volt age R. Sundararajan and R. S. Gorur Department of Electrical Engineering, Arizona State University, Tempe, Arizona ABSTRACT In this paper, a d y n a m i c m o d e l that c o m p u t e s the flashover voltages of p o l l u t e d insulators energized w i t h d c voltage is pre- sented. The salient f e a t u r e of this m o d e l is that it t a k e s into a c c o u n t the configuration of the insulator profile at e v e r y in- stant, which plays an important role in the flashover process of the d c polluted insulators. A number of practical insulator geometries have been s t u d i e d to demonstrate the model. The validity of the m o d e l was verified b y c o m p a r i n g the c o m p u t e d results w i t h the e x p e r i m e n t a l results of previous researchers and good correlation has been shown. 1. INTRODUCTION the pollutant, particle size [5,6, 10-121, nonuniform wet- ting [l,5, 111, surface condu