With recent advances in technology, utilities generation (DG) on the distribution systems. Reliability worth is very important in power system planning and operation. Having a DG ensures reli increase the reliability worth. This research project presents the study of a radial distribution system and the impact of placing DG in order to increase the reliability worth. where a DG have to be placed. The reliability improvement is measured by different reliability indices that include SAIDI, CAIDI, ENS and ECOTS. In addition each feeder of the system, as well as the amount of DG installed are presented. The research also pretends to recall the impotence of understanding of power system reliability from a investment view for distribution companies in order to enhance the DG installat costumer. The studies performed are supported with the Power Management System Software ETAP.

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