Voltage-time characteristics and related approximation formula for 6.6-Kv solid-core distribution insulator

Abstract

To establish an optimal lightning protection method for power distribution lines, factors such as the insulation level of power distribution lines as well as the mechanism behind lightning surges should be taken into consideration. This study experimentally clarifies the voltage-time characteristics of currently used 6.6-kV polymeric insulators in electric power distribution system by considering the differences in polarity and the presence or absence of slurry. Furthermore, we propose approximation formulas based on the sparkover model for calculating the flashover characteristics of 6.6-kV power distribution insulators, which can contribute to insulation coordination throughout the power distribution network.