Assessment of Wind-Induced Effects on Lightning Shielding Performance of Overhead Power Transmission Lines

Purpose. This article aims to provide an overview of research concerning the influence of wind-induced effects on the lightning shielding performance of overhead power transmission lines. Methodology. The study utilizes the Electrogeometric Model (EGM) as a foundation and examines how wind-induced conductor movement affects lightning attachment points. The EGM, a widely recognized mathematical model, offers insights into the lightning shielding performance of transmission lines. The analysis considers wind pressure, lightning current magnitude, and conductor sway. Results. Observations reveal that while the EGM provides estimations of lightning attachment points, it does not account for dynamic conductor effects. Wind-induced conductor movement can alter the lightning shielding failure zone, potentially exposing phase conductors to direct lightning strikes. Calculations using the EGM confirm the impact of wind-induced movement on shielding failure width. Even at relatively low wind pressure of 100 Pa (12.78 m/s), the width of the unprotected zone increases to 150.28% at a lightning current of 3 kA and to 191.12% at a current of 5 kA. Originality. This work expands on existing lightning protection assessments by incorporating wind-induced effects and conductor dynamics. The study highlights discrepancies between EGM-calculated and observed lightning strikes and explains the role of conductor deflection in these variations. Practical Value. The findings emphasize the importance of considering wind-induced conductor movement in lightning protection strategies for overhead transmission lines. The study underscores the need for more comprehensive models that account for conductor dynamics and environmental conditions. Conclusions. Wind-induced movement of shield wires and phase conductors can significantly influence lightning shielding performance. The study calls for advanced modeling techniques that incorporate conductor dynamics, meteorological data, and specific line characteristics to provide more accurate and reliable assessments of lightning protection. References 15, figures 4.