Abstract
This study investigates the impact of considering insulation volt-time curves on estimating the annual flashover rate of overhead lines subjected to nearby lightning strikes in the presence of ocean-land environments. A method based on the 3D Finite Element Method is employed to compute induced voltages, while a Monte Carlo simulation determines the annual flashover occurrence. To detect Flashover occurrence a volt-time method is employed and the results are compared with the conventional 1.5CFO criterion. The influence of line proximity to the coastline, pole spacing, and various striking distance calculation methods on flashover predictions is evaluated. Results indicate that the 1.5CFO criterion underestimates the annual flashover rate due to indirect lightning in mixed ocean-land terrains compared to the volt-time curve approach. A novel analytical formula is proposed to estimate annual flashovers considering volt-time curves in such environments.
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