This research presents how to design and test the system against excess flow of distribution system. Mae Sariang district, because it needs to connect the small power plant (Distributed Generations: DG) added to the system and also needs to be developed for this system to work the micro grids. But to add to the DG in the system and a micro-grid. To make the size and direction of the circuit has changed from the original. Micro-grid system can work Grid-connected mode is mode 2 and mode of Islanding situation, so in this system, it can happen multiple. In research, it has been divided in different situations in Grid-connected mode and mode of Islanding. Grid-connected if the problem of malfunctioning protective equipment will be corrected immediately. In order to prevent system works in every situation. Afterwards, will be tested in the Islanding mode if you experience problems of malfunctioning protective equipment. In this research, create simulated DIgSILENT Powerfactory program.
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