To provide a distribution line supervisory control device which can minimize a service interruption range and service interruption period by switching over a section except the section of accident in an uniterruptive manner or by instantaneous service interruption, when an accident occurs in a distribution system.

With this control device, voltage current sensors 51-55 are installed in or in the vicinity of the respective switches 11-15 and 21. By giving the data of the sensors to the corresponding subsidiary station devices 41-46, determination of the ground fault direction is enabled when a ground fault accident occurs. When the ground fault direction data of a prescribed subsidiary station device are different from those of a subsidiary station device adjacent to the power source side, the prescribed subsidiary station device is determined as being the load side of the accident section; when the ground fault data of the prescribed subsidiary station device are different from those of the subsidiary station device adjacent to the load side, the prescribed subsidiary station device is determined to be the power source side in the accident section; and an opening command is generated to a normally closed switch which corresponds to the prescribed subsidiary station device.