| 摘要 |
PROBLEM TO BE SOLVED: To impart a function of indicating that a voltage adjustment function reaches a limit to a column upper transformer with an automatic tap switching function.SOLUTION: A column upper transformer with an automatic tap switching function comprises: an alarm display part 31 attached to a tank of a transformer or a control box attached to the tank in a state of being visually observable from ground; a tap position detector 15 for detecting a tap selected by a tap switching unit 14; and a display controller 33. The display controller 33 causes the alarm display part 31 to perform a display operation when, in a state in which the tap position detector 15 detects that a tap selected by the tap switching unit 14 is a limit tap on a side of stepping down a secondary side voltage of a tapped transformer 13, a state in which the secondary side voltage of the tapped transformer 13 exceeds an upper limit in an adjustable range is continued for a set period of time. |
