PURPOSE:To suppress the voltage allotment applied between the turns of a winding by a method wherein, in the transformer winding with a star-connected phase-shifting winding, the main winding consisting of a long side winding, having numerous number of turns, is connected to the side of line terminal and the phase-shifting winding consisting of a short-side winding having few number of turns is connected to the side of neutral point. CONSTITUTION:The main winding 1 consisting of a long side winding of numerous number of turns is connected to the side of line ends U, V and W, and the phase- shifting winding 2 consisting of a short side winding having few number of turns is connected to the O-side of the neutral point. If the ratio of number of turns of the main winding 1 and the phase-shifting winding is same, the ratio of current running on the winding and their phase become equal completely. Moreover, the voltage always applied between the main winding 1 and the phase-shifting winding 2 wound around the same leg becomes the induced voltage of the lowest phase-shifting winding 2. Also, the allotment voltage per winding can be reduced, because the main winding 1 having numerous number of turns is arranged on the line side even when the external lightning intruded from the line terminals U, V and W is allotted by the winding on the line side only.
展开▼
