In recent years, the method of insulating electrical circuits using ground relays has been used for ground-fault current detection in power facilities, ; however, we cannot identify the causes of the ground-fault. In this study, by focusing on the eight major causes of ground-fault, namely “Tree contact”, “Insulator crack”, “Surface pollution”, “Rain”, “VS insulator deterioration”, “Induced thunder”, “VT breakage” and “Power cable”, we evaluate the cause by using the new decision method. The results of this study show that the decision method proposed in this study can identify the cause of ground-fault with high accuracy via decision tree analysis, and that it is possible to construct a sophisticated energy supply and demand system.
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