Analysis of Lightning Overvoltages Due to Direct Strikes on Hybrid Overhead Lines

To address space constraints in constructing new distribution lines, some power utilities have adopted the practice of installing multiple circuits with different voltage ratings on shared tower structures. This approach, known as “hybrid overhead line” (HOHL), combines subtransmission and distribution circuits. While this practice offers significant potential to reduce investment by leveraging existing infrastructure, technical studies on the behavior and performance of hybrid lines subjected to lightning overvoltages remain limited.