| 摘要 |
PROBLEM TO BE SOLVED: To form a structure, having interchangeability for use with a changeover switch using a vacuum valve in a cut-off unit of an on-load tap changer, rather than a changeover switch of a conventional on-load tap changer. SOLUTION: The on-load tap changer comprises an adapter 7 for electrically connecting the changeover switch 4a, using the vacuum valve in the cut-off unit 1a to a tap selector 5, in a structure in which an axial size between an input shaft 13 and a drive shaft 14 of a transmission 12a for transmitting a power from an external power unit to an energizing mechanism 2 for driving the cut-off unit 1a is made alterable.
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