Evaluation of electrical performance on high voltage glass suspended insulators

This paper is aimed at the comparison of performances of different types of glass insulators in dry conditions, under different types of voltage waveforms namely DC, AC and lightning impulse voltages. It is shown that the arcing distance is the main parameter influencing the flashover voltage. However, the difference between flashover voltages for the different voltage waveforms reduces when the arcing distance of insulators is increased. A comparison between experimental results with those obtained by using the streamer criterion as well as those given by empirical formulas, is presented.