Improving the reliability of power distribution systems through single-phase tripping

this paper discusses the reliability benefits (reduction in SAIFI and SAIDI) that could be achieved through the implementation of single-phase tripping in four-wire multigrounded medium-voltage distribution feeders. Several issues and concerns regarding the potential problems caused by single-phase tripping are discussed, and the potential reliability benefits due to the implementation of this protection scheme for a real distribution system of the USA are presented and discussed. These benefits were estimated by running multiple simulations using a predictive reliability model.