Assessment of Field Data Related to the Lightning Performance of Overhead Lines in the Context of Validating Lightning Performance Estimation Methodologies

Evaluating the lightning performance of overhead lines is crucial for ensuring the reliability of the transmission system. Several methodologies for the evaluation of the lightning performance have been proposed yielding considerably different lightning flashover rate predictions due to different assumptions and simplifications. Hence, the validation of these methodologies requires further attention. In this context, this work first deals with the assessment of field data related to the lightning performance of overhead lines; recently published field data are reviewed. Factors impeding straightforward comparisons as well as assumptions due to lack of critical information are discussed in an effort to contribute to a more accurate assessment of the lightning performance of overhead lines. The analysis is complemented by fast-front electromagnetic transient and fractal-based lightning attachment simulation results, as well as lightning flashover rate computations.