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강현구(Hyun-gu Kang),옥연호(Yun-Ho Ok),김영국(Yong-kuk Kim),이붕용(Bung-yong Lee),한호연(Ho-yeon Han),임재일(Jae-il Lim) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
The role of the Speed relay of the water turbine generator is to measure the rotation speed of it and find out that the present speed condition is proper for the generator system. So it is necessary to check up the equipment regularly. This study shows the theory of the speed relay and the solution about the malfunction caused by the characteristic change of the relay.