Dr. Lenarczyk received his MSc and PhD in HV engineering from Warsaw University of Technology. In 2004, he joined the Polish Transmission System Operator where his areas of activity include technical aspects of transmission lines, covering: insulators, grounding, conductors, fittings, cables and equipment. He is a member of the CIGRE WG, Chairman of the Polish SC CIGRE B2 Overhead Lines and participates in the Committee on Lightning Protection at the Polish Electricians Association.
Lightning discharges can cause significant damage to HV transmission lines, resulting in temporary disconnection, shutdown or re-closures in the case of direct strikes or in temporary disturbances due to nearby strikes. Assessment of whether a shutdown or temporary line disconnection has been caused by direct or nearby strike can sometimes be difficult since verification of equipment damage usually requires visual inspection. This presentation describes how the Polish TSO has been collecting and addressing data on HV transmission line lightning performance since 2006 with focus on recorded cloud-to-ground discharges. It also reviews case histories of lightning related shutdowns of 220 kV and 400 kV overhead lines.