Techniques for the improvement of the lightning back-flashover performance of double circuit HVDC lines

This paper addresses different issues regarding the lightning back-flashover performance of HVDC lines, especially double-circuit configurations. In such configurations, two poles may present very similar flashover risks due to a strike, leading double flashover. Therefore, it is particular interest investigate solutions protect at least one circuit from flashovers and avoid temporary loss transmitted power associated consequences system. this work, electromagnetic transient models are implemented for improvement performance: installation surge arresters use unbalanced insulation. The results analysed thoroughly mechanisms theoretical bases behind them explained. addition grounding resistance tower, coupling between conductors DC pole configuration within tower also play major role in determining line. single arrester can achieve significant overall tower. A proper implementation an insulation solution effective limiting incidence while maintaining optimal performance.