| 摘要 |
PURPOSE:To execute automatically the change-over of a reference tap at the time of the direction inversion of a power tidal current, to execute it with a uninterruption and in a short time and to stabilize a line voltage by providing a tap changing-over device at the time of the load equipped with a tap selecting device for n taps. CONSTITUTION:Taps pulled out from (n-1)-equally-divided tap winding for the n taps at a auto-transformer TA e.g., t1'-t9' are respectively connected to fixed contacts t1-t9 of a tap changing-over device 1 at the time of a load. Out of these taps, at the time of the forward sending power or at the time of the reverse sending power, a tap, which is a reference tap, is selected. The reference object tap is at least two, and these are connected even to the tap changing-over device 2 at the time of the load. A tap selecting device 3 of the changing-over device 1 is connected to one side line terminal 5a of a usual power source side and a tap selecting device 4 of the changing-over device 2 is connected through a current transformer CT to one side line terminal 6a at a usual load side. At the time of the forward sending power and at the time of the reverse sending power, in the relation of the load side line voltage or the input voltage and the reference tap voltage, the selecting control of the changing-over devices 1 and 2 is executed. |
