分岐線を有しない配電線の共同接地線を用いた断線点推定手法

抄録

When a disconnection occurs in the high-voltage distribution line, the conductor of the wire contacts the ground belt, resulting in a ground fault accident. In the case where the conductor of the electric wire is covered with a coating, a ground fault accident does not occur even if it contacts the ground belt. Under such a situation, it is not possible to grasp the disconnection of the distribution line. Studies using a smart meter have been conducted to specify the disconnection point of the distribution line. In order to specify the disconnection point using the smart meter, it is necessary to install a large number of smart meters on the distribution line. The authors propose a method which can inexpensively locate disconnection points of power equipment to areas where it is difficult to install many smart meters or to emerging countries where power facilities are to be constructed in the future. In this method, only the ground wire at the end of the two distribution lines is connected, and the disconnection point is specified from the time difference of the zero crossing point of the current flowing at the rising of the common ground line of the two distribution lines at the time of disconnection. In this method, disconnection points can be specified by installing a current measuring device on the common ground line of the rising edge of the distribution line, resulting in an inexpensive system.