| 摘要 |
A three-phase transformer including tap changing apparatus for switching the turns ratio between the primary and secondary windings of the transformer. The tap changer includes a mounting board on which three contact sets are mounted; each set having a plurality of stationary contacts arranged in a circular pattern. A circular-shaped operating member, with a movable contact assembly affixed thereto, is associated with each contact set and is pivotable around the center of the stationary contact set to allow the movable contact assembly to sequentially engage successive stationary contacts. A connecting bar is coupled to each operating member in spaced relation from its axis of rotation, causing all three operating members to rotate together. A worm gear assembly connects an operating handle mounted outside the transformer enclosure to the connecting bar such that rotation of the operating handle causes linear movement of the connecting bar which is translated into arcuate motion of all three operating members to simultaneously switch the tap settings on the transformer.
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