RELRAD - AN ANALYTICAL APPROACH FOR DISTRIBUTION-SYSTEM RELIABILITY ASSESSMENT

The use of reliability analysis within the framework of distribution system planning. A specific model for reliability calculations in radially operated distribution systems. Due to increased outage costs in terms of specific costs of non-delivered power and energy (NDP and NDE), an increased part of system operating costs is related to reliability aspects. Customer's outage costs, based on the willingness-to-pay principle, are given the same principal treatment as power system electrical losses. This approach is becoming generally accepted by the power companies in Norway. The reliability model is based on an analytical approach, connecting component failures to load point outages. The description is based on statistical distributions. Two case studies are reported in the paper.