Lightning Performance of Medium Voltage Distribution Networks

The need for uninterruptable electrical power supply of good quality emerges lightning protection of distribution networks an issue of high importance for power utilities. The adequate protection of distribution substations and lines ensures the reliable operation of the network and prevents damages of the equipment. The current work addresses the lightning performance of complex medium voltage networks, considering the impact of the installation position of the protective devices on the lightning failure rate. In details, the mean time between failures for each transformer of the network under study is estimated for both direct and indirect lightning overvoltages, applying an appropriate methodology. The simulation results reveal that the appropriate placement of the protective devices (surge arresters or/and arcing horns) at critical positions of the network improves its lightning performance. The outcomes of the current work are useful for power utilities to design in a more efficient way the lightning protection configuration of their networks.