On the optimal placement of surge arresters for the efficient protection of medium voltage distribution networks against atmospheric overvoltages

The overhead distribution networks are susceptible to atmospheric discharges that may cause serious damages to the equipment and result in interruptions of the power supply. The installation of surge arresters at the primary of the distribution transformer is the main protective measure to limit the destructive consequences of an arising lightning overvoltage, considering that ineffectiveness of the overhead ground wires due to the low insulation level, the difficulty to improve the grounding resistance and the insulation withstand capability. The purpose of this work is the optimal placement of surge arresters for the efficient protection of medium voltage networks against atmospheric overvoltages.