Influence of Humidity on Lightning and Switching Impulse Flashover Voltages

A long run flashover test was carried out from 1967 to 1969 to investigate the effect of atmospheric humidity on lightning and switching 50-percent flashover voltages of air gaps and suspension insulators. From the test results, it was found that the influence of humidity on flashover voltages of air gaps varied greatly from their flashover voltage-gap length characteristics.