A comparison on leakage current of 22 kV porcelain insulator by using rotating wheel tester with high voltage AC and impulse voltage excitation

Abstract

This paper describes the leakage current (LC) on pin type porcelain insulator surface evaluated by the
rotating wheel tester. The experiments, which were at High Voltage Laboratory, Faculty of Engineering,
Khon Kaen University, Thailand, has been studied under the condition of environment damage with surface
contamination of specimen and then excited by electrical stresses for aging. The experiments were divided in
two cases – high voltage alternating current (HVAC) and HVAC alternating with impulse excitation voltage. The
experimental results show that the LC on specimen surfaces for both cases gradually increases almost the
same results for the first 100 cycles after that it rapidly increase with rotating wheel more than 100 cycles.
Above 315 cycles, the LC is obviously different in both cases.