Insulation Protection of Substation Against Lightning Surge Taking Account of Multi-phase Simultaneous Back-flashover of the Transmission Line

摘要

If a lightning back-flashover occurs on a transmission line tower, the lightning surge will be transmitted by the line conductor and penetrate into a substation. Overvoltage protection methods for substations are already published in several papers. In the present analytical method, however, it is assumed that the back-flashover takes place at only one of six line conductors installd on one transmission tower.