Reduction of the double-circuit flashovers on a 400 kV overhead line

Double circuit flashovers may cause very severe system disturbances when taking place on some critical double-circuit lines of an electrical network. Line arresters offer efficient solution to protect these specific against double outages due lightning. This paper will study, a 400-kV line, the protection provided by line The efficiency several configurations be compared. For that purpose, lightning flashover rates with and without calculated using newly developed software which includes three-dimensional electro-geometric model is able take into account random nature automatically launches EMTP-RV (restructured version EMTP) for analyzing fast front overvoltages impressed insulation. energy stressing also in order evaluate risk failure excess absorption. Furthermore, effects other parameters such as tower footing resistances, withstand voltages insulator strings well protective levels investigated.