Abstract: Across current compensation control system includes a cross current detection compensator having an input terminal to which a cross connection line that cross-connects the secondary sides of auxiliary current transformers (CTs) are connected, and an output terminal to which cross current compensation lines that connect the secondary sides of CTs in series are connected, in which the cross current detection compensator supplies a compensation current to the cross current compensation line so as to cancel the current component corresponding to the cross current that appears at the secondary sides of the CTs when detecting the cross current that circulates within a bus bar, a distribution line, and a switch.

Abstract: A monitoring and control system includes a center main system (209) installed in a sales office and a substitute center system (208). The monitoring and control system further includes a different substation terminal interconnection function that, in the case where there occurs an abnormality to a communication channel provided for each substation terminal and connects the substation terminal to the center main system (or the substitute center system), instructs a different substation terminal to perform the interconnection and communication with the center main system (or the substitute center system) instead of the substation terminal. With this construction, through the different substation terminal that received the instruction, the center main system monitors and controls a switch to be monitored by the substation terminal connected to the communication channel to which the abnormality occurs.

Abstract: A monitoring and control system includes a center main system (209) installed in a sales office and a substitute center system (208). The monitoring and control system further includes a different substation terminal interconnection function that, in the case where there occurs an abnormality to a communication channel provided for each substation terminal and connects the substation terminal to the center main system (or the substitute center system), instructs a different substation terminal to perform the interconnection and communication with the center main system (or the substitute center system) instead of the substation terminal. With this construction, through the different substation terminal that received the instruction, the center main system monitors and controls a switch to be monitored by the substation terminal connected to the communication channel to which the abnormality occurs.

Abstract: A cross current compensation control system includes a cross current detection compensator having an input terminal to which a cross connection line that cross-connects the secondary sides of auxiliary CTs are connected, and an output terminal to which cross current compensation lines that connect the secondary sides of a plurality of CTs in series are connected, in which the cross current detection compensator supplies a compensation current to the cross current compensation line so as to cancel the current component corresponding to the cross current that appears at the secondary sides of the CTs when detecting the cross current that circulates within the bus bar, the distributions and the switch.

Abstract: A distribution control system includes in each of feeder terminal units a controller that updates a value in a latest current value storage area of a memory, every time a current value is detected at a sampling interval. If a distribution line fault takes place, that is, if the detected current value exceeds a reference value, each controller stores the current value in a fault current value storage area of the memory as a fault current value. The feeder terminal units each supply the information about the fault current to a control center through a substation remote terminal unit so that the control center identifies a fault section from the information for detecting the fault section.