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The number of the small power producers (SPP) has been increased. It makes the scale of the distribution system more complicated and difficult to design the protective devices coordination due to its effected to distribution system. Hence, This paper presents an expert system for protective devices coordination in radial distribution network with considered small power producers. The scope of this study is the radial distribution system 22 kV or 33 kV with the protective devices such as over current relay, recloser and fuse. The proposed expert system has been implemented and simulated. The simulation results have shown that it generates satisfactory results. In addition, it takes a few minute to calculate the results. Index Terms-Expert system, protective device coordination, small power producer.Suttichai Premrudeepreechacharn received the B.Eng. in electrical engineering from Chiang Mai University, Thailand and M.S. and Ph.D. in electric power engineering from Rensselaer Polytechnic Institute, Troy, NY. He is an associate professor at Department of Electrical Engineering, Chiang Mai University, Thailand. His research interests include power quality, high quality utility interface, power electronics and artificial intelligence applied power system.

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