Technical efficiency of the shunt breaker in the exploitation of distribution networks

Through this paper the authors aim to demonstrate that in mixed networks (overhead + underground) as the share of underground distribution lines increases compared to the overhead lines, the technical efficiency related to "suppression" transient single-phase defects decreases, having at their disposal a database of events resulting from the operation of distribution networks with the neutral treated by a resistor associated with a shunt breaker. Moreover, one of the criteria underlying the choice of the method of treating the 20 kV neutral with a resistor associated with a shunt breaker, for a given medium voltage distribution network, is represented by the weight between the overhead lines and the underground network.