Assessment of Overvoltage in Double-Circuit Distribution Lines Caused by Direct Lightning Strokes Under Various Conditions

Lightning Overvoltage represents a critical factor impacting the stability and reliability of equipment in distribution systems. A comprehensive understanding of the generation mechanisms and propagation characteristics of induced overvoltage is essential for enhancing the operational stability and lightning resistance of distribution lines. This paper focuses on a 10 kV parallel double-circuit overhead distribution line and establishes a computational model based on the Partial Element Equivalent Circuit (PEEC) method and Multi-conductor Transmission Line (MTL) theory. A systematic analysis was conducted to investigate the influence of parameters such as lightning current waveform, amplitude, grounding resistance, and stroke location on the induced overvoltage response. The results demonstrate that increasing the amplitude of lightning current significantly increases the chances of flashover on the insulator, while high grounding resistance exacerbates the fluctuation of induced voltage. Properly configured surge arresters effectively limit the propagation of induced current and enhance the lightning protection performance of the line. Moreover, numerical simulations reveal the dynamic characteristics and spatial-temporal distribution of induced overvoltage, providing quantitative insights for optimizing lightning protection strategies.