| 摘要 |
PURPOSE:To enable setting a wider tap adjustment width even in an autotransformer of comparatively small winding number ratio by adding a series transformer wherein the primary side is magnetized by tap winding output voltage and the secondary side is connected in series to the series winding. CONSTITUTION:A main autotransformer provides a series winding 1, a shunt winding 2 and a tap winding 3 at a neutral point side. A series transformer 10 is so provided that a primary winding 11 is magnetized by the output voltage of the tap winding 3 and a secondary winding 12 is connected to the series winding 1 in series. If the tap winding 3 is connected to the same polarity with the shunt winding 2, the series transformer 10 is so connected that the opposite polarity voltage is applied to the shunt winding 2. This enables to change the effective windings of the windings 1, 2 simultaneously mutual reverse directions by switching the operating number of windings and the polarity of the tap winding 3 by a tap switch S and a wide tap adjustment width can be set even in an autotransformer of comparatively small number of windings ratio. |
