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This paper introduces a procedure for sizing and locating Distributed Generator (DG) in order to loss reduction considering protection coordination constraints. Proposed method of the paper is a mixing of two different issues. One network losses and the other are impacts of DG on network protection. The procedure is useful in finding optimal size and location of DG that after installing to the primary distribution network lead to reducing active power losses of the network while satisfying protection constraints of the network. These protection constraints define an allowable range for DG size. Finally the effectiveness of procedure by help of MATLAB codes for a radial distribution network is examined.