In recent years, by the construction of electricity market and introduction of electric energy as a commodity, power loss reduction is of paramount importance for utilities. Distribution system losses are comprised of technical and nontechnical parts. Technical and non-technical losses are related to physical features and impermissible use of electricity, respectively. The first step toward power loss reduction is to determine the reasons behind power loss and its quantity. Recent researches mainly focused on overall power loss in a wide region. However, it is required to initiate with partial power loss of a transformer and reach a large region step-by-step in order to determine the contribution of each part. In this paper, methods are proposed to calculate power loss in a typical distribution transformer feeder and then the obtained results are compared with actual measurements. Therefore, a distribution transformer equipped with a data logger (DL) in Mashhad City (Ommat 9- region) is selected. Results show that the computational method can easily and appropriately compute power loss using available and typical network data

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