Assessment of lightning damage of OGW by comparing natural effects and the common Joule heat & arc heat model application

作者：Liu, Gang; Guo, Deming; Wang, Peifeng; Peng, Xiangyang; Lin, Xuan; Chen, Lyuwen; Wang, Rui; Lyu, Weitao^*

来源：ELECTRIC POWER SYSTEMS RESEARCH, 2023, 223: 109673.

DOI：10.1016/j.epsr.2023.109673

• Natural lightning strike
• Damage
• Overhead ground wire
• Numerical model
• Injected lightning energy

Acquisition and analysis of the thermal damage and injected energy data of the natural lightning strikes are conducive to understand the lightning-induced damage mechanism of OGW (Overhead Ground Wire) as well as guide the improvement of the lightning simulation experimental methods in the laboratory. In this paper, a rupture accident of OGW in the power grid, which was taken as a natural lightning strike damage experiment, was used to compare the thermal damage and the injected energy with the existing common Joule heat & arc heat transfer model. The results indicated that the thermal damage of the common model is milder than that of natural lighting strike. In this accident, at least more than 45% of the injected natural lightning energy was not sourced when adopting the existing common model to simulate the thermal damage of OGW, even after considering the electrons enthalpy flux that is usually neglected in calculation.