Evaluating Lightning Performance of Overhead Lines & Methods for Reducing Trip Rate by Ertugrul Partal

High Ground Flash Density in certain regions can adversely impact performance of transmission lines and lightning studies must therefore be conducted regularly to ensure the system is at best performance and giving continuous supply to users. This presentation explains procedures for evaluating performance of 154 kV overhead lines, based on experience in Turkey. Historical tripping data is analyzed and compared to the international standard as well as other utility practices. Approaches to evaluate performance involving software simulations are also considered, as is lightning stroke data that is compared with tripping pattern. Finally, meaures are proposed to reduce OHL tripping due to lightning.