Estimation of Lightning Performance of Double-Circuit Overhead Power Lines without an Overhead Ground Wire using Line Lightning Protection Devices of Enhanced Quenching Capability

A new type of closed-type lightning protection multi-chamber arrester named impulse quenching line lightning protection device (LLPD) used for protection of overhead power lines is described. After the passing of lightning current, the multi-chamber system of the arrester prevents the occurrence of a network short-circuit current due to the total voltage drop across several thousand series-connected spark gaps that significantly exceeds the applied network voltage in magnitude. The total operating time of the LLPD is less than 1 ms which is not sensitive for microprocessor and relay protection of overhead lines. A computational estimation of the emergency outage rate of double-circuit overhead power lines without an overhead ground wire resulting from lightning overvoltage was carried out. Number of current impulses used when arresters are tested for quenching capacity as well as their parameters were determined by the mathematical modeling using the statistical Monte Carlo method. Results of calculation that make it possible to determine the efficiency of lightning protection of double-circuit overhead lines with various placement schemes of the line lightning protection device LLPD-110 of the company Streamer Electric AG are presented in the conclusion.