V-t Characteristics and Approximation Formula for 6.6-kV Solid-core Distribution Insulator

摘要

A number of factors, including the mechanism of lightning surges as well as the topology and insulation level of power distribution lines, should be taken into consideration to establish an optimal lightning protection method for power distribution lines. This study experimentally clarifies the voltage-time characteristics of currently used 6.6-kV power distribution insulators by considering differences in polarity and the presence or absence of contamination. Furthermore, in this paper 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 system.