In a delta-wound three-phase generator, motor, or transformer, how are two of the phase windings connected relative to the third?

In a delta-wound three-phase generator, motor, or transformer, how are two of the phase windings connected relative to the third?

• A. In series across the third (phase) winding.
• B. In parallel across the third (phase) winding.
• C. In series with the third winding.
• D. In parallel with the third winding.

Answer: (A)

In a delta connection the three phase windings form a closed triangle, each winding connected between two corners of the triangle. If you focus on one winding as the “third,” the ends of the other two windings connect in a way that forms a continuous path from one end of that third winding to its other end. In other words, the two remaining windings are arranged in series across the third winding. This series path around the triangle means the two windings together present the same load seen across the third winding, reflecting the delta’s characteristic of windings connected in series around the loop.

In a delta connection the three phase windings form a closed triangle, each winding connected between two corners of the triangle. If you focus on one winding as the “third,” the ends of the other two windings connect in a way that forms a continuous path from one end of that third winding to its other end. In other words, the two remaining windings are arranged in series across the third winding. This series path around the triangle means the two windings together present the same load seen across the third winding, reflecting the delta’s characteristic of windings connected in series around the loop.