Ground fault point system, ground fault point finder, ground fault point determining method, program

摘要

Problem to be solved: to determine the ground point at the time of a ground fault in a distribution system consisting of a distribution line including a branch point such as a T-junction or a cross branch.Multiple measuring terminals andA ground fault point indicator 100 connected communicatively with the plurality of measurement terminalsConsists ofWhen a ground fault occurred on the distribution lineIt is transmitted from the combination of one or more measurement terminals of the three or more measurement terminals installed at the junction pointInformation of zero phase current and zero phase voltage corresponding to the current time is transmitted to the ground fault point controller.Based on the information and the surge propagation rateA ground fault location system for locating ground points of said distribution lineGround fault point indicatorWhether or not the ground fault point exists inside a predetermined region centered on the branch point of the distribution line is determined.If it is found to be outside the predetermined range,Among the expected combinations of all the measurement terminalsSome ground combinations are used to locate the ground fault points.Diagram