| 摘要 |
<p>PURPOSE:To make it possible to do three-phase distribution of neutral point grounding with simple constitution by connecting one end of a first grounding wiring with one end of a second grounding wiring so as to ground them in common, and connecting the other end of the first grounding winding with a second tap, and connecting the other end of a second grounding winding with a first tap. CONSTITUTION:One terminal Ug of a first grounding winding Cug and one terminal Vg of a second grounding winding Cwg are connected in common, and the common connection point O is connected to a bushing terminal B0 for grounding. The tap U2t of the secondary winding Cu2 of a unit transformer M1 is connected to the other terminal Vge of the grounding winding Cwg of a unit transformer M2, and the tap V2t of the secondary winding Cw2 of the unit transformer M2 is connected to the other terminal Uge of the grounding winding Cug of the unit transformer M1. If it is defined that voltage between terminals U2, V2 and W2 is E2, and the voltages to ground are U20, V20 and W20, these sizes E20 are equal from the relation of the number of turns, which has the phase difference of 120 deg., and E2=3<1/2>E20. That is, the neutral point of the terminals U2, V2 and W2 is zero.</p> |
