共同接地線に流れる地絡電流を用いた地絡点に至る分岐点推定

抄録

Authors have investigated a method to estimate the branch point leading to ground fault location as trunk line between two adjacent distribution lines in case of high resistivity ground fault with voltage gap in distribution line. Ground fault wave form in high resistivity with voltage gap shows often the triangular wave. The terminal points of two adjacent distribution lines need to be connected by common earthing conductor to apply ground fault locating method using common earthing conductor. The branch point up to ground fault location in trunk line between two adjacent distribution lines can be estimated from the time difference of the zero crossover point, where ground fault current flows to grounding electrode of distribution lines via common earthing conductor. This paper clarifies that the origin of the time difference of zero crossover point is related to phase difference of ground fault currents measured at electrodes of two adjacent distribution lines, using by ATP simulation. And this paper mentions field application of distribution line and measurement system of ground fault current flowing to common earthing conductor.