Optimal Line Surge Arresters Installation Using Lightning Location System

摘要

The paper presents a methodology for the reduction of the number of lightning flashovers on a 220 kV double-circuit line. From the geometry of the line and the ground-flash density it is possible to calculate the number of flashovers. The procedure for the calculation of flashovers includes three steps: application of an electro-geometric model, simulation of the electromagnetic transients due to lightning strokes and evaluation of the flashover rate. The models of the elements used in the calculation are presented: lightning stroke current, tower, conductors, insulator string, line surge arrester (LSA) and tower footing resistance. The case study of a 220 kV double-circuit overhead line is conducted in order to improve its lightning performance. Different mitigation measures on a line for prevention of flashovers could be applied and one of the most effective means is the installation ofLSAs. The best solution depends on the number ofLSAs, their location and their price. Data from Lightning location system (LLS) can also help for the choice of towers for LSA installation. Calculations are conducted using the software EMTP-R V and LIPS.