Impact of Grounding Modeling on Lightning-Induced Voltages Evaluation in Distribution Lines

Lightning-induced voltages are one of the main causes shutdown in distribution lines. In this work, attention is focused on effects wideband modeling electric grounding overvoltage calculation along insulator strings due to indirect lightning strikes. This study done directly time-domain with being represented an equivalent circuit accounting for its dynamics. Results show that adoption commonly adopted simplified models, such as low-frequency resistance, may lead underestimation overvoltage. According results, differences order 25% can be found some studied cases.