The Impact of Transmission Line Modeling on Lightning Overvoltage

In most of the work that investigates backflashover phenomenon due to direct lightning strikes, using EMT-type simulators, transmission lines are represented by J. Marti model and ground effect is computed employing R. Carson’s formulations. Thus, displacement current neglected, line voltage definition corresponds wire potential formulation, soil resistivity considered frequency-independent. These considerations can lead erroneous measurements occurrences in insulator strings line. this sense, paper presents a systematic sensitivity analysis study overvoltage considering more physically consistent models line, which consider current, admittance correction, rigorous definition, frequency-dependent parameters. According results, for case study, parameters modeling present maximum percentual difference around 71.54%, frequency range first strokes. This leads percent 5.25% across strings. differences confirm occurrence or not strings, including disruption time, sensitive considered.