Neutral-grounded structure for delta-connected windings and method thereof

A neutral-grounded structure for delta-connected windings, the delta-connected windings comprising a first phase winding, a second phase winding, and a third phase winding, each of the first phase winding, the second phase winding, and the third phase winding having N turns, the neutral-grounded structure comprising:

• a grounding winding group disposed on at least one of the first phase winding, the second phase winding, and the third phase winding, the grounding winding group comprising at least two grounding windings connected in parallel, each of the grounding windings having turns that are (⅓)N turns of one of the phase windings, wherein the first end of the grounding winding group is connected to a grounded point which is utilized as a neutral point, the second end of the grounding winding group is connected to a tap of one of the other two phase windings, the tap is at (⅓)N turns of one of the other two phase windings, and the voltage phase displacement between the grounding winding group and the phase winding corresponding to the grounding winding is 180 degrees.