engleski

Reduction of Flashovers on 220 kV Double-Circuits Line

The paper presents the results of a study for the reduction of the number of flashovers on a 220 kV double-circuit line. With known geometry of the tower and 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 evaluating the flashover rate. Models of the elements in the calculation are presented: source of lightning stroke, tower, conductors, insulator string, line surge arrester (LSA) and tower footing resistance. The case study for the 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 of LSAs. The final choice of the best solution depends on the number of LSAs, their location and their price. Calculations are conducted using the software EMTP-RV and LIPS.

220 kV double-circuit line; modeling; EMTP-RV; LIPS; flashover; lightning performance; LSA.

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