Study on Measures for Improving Lightning Protection Performance of 10 kV Overhead Insulation-covered Conductors

In order to protect the distribution lines,the paper establishes simulation model by electromagnetic transient program (EMTP),analyzes and compares the effect of improving lightning withstand level by line surge arrester in different programs.The influence of impulse grounding resistance of towers and the locations where lightning stroked are analyzed.Chowdhuri-g-ross model was used to calculate the induced overvoltage,and the inhibitory effect of arrester was analyzed.The results showed that installing the line surge arresters can effectively improve the lightning withstand level of transmission line and inhibit the induced overvoltage.The measures,such as reducing grounding resistance of the towers,installing metal oxide surge arrester with series gap and arc-protection hardware with stabs,can effectively reduce the rate of flashover and lightning-caused breaking of covered conductors of 10 kV distribution lines.