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Which of the following connection is best suited for 3-ph, 4
wire system
A delta-delta B star-star
C delta-star D star-delta
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Answer Posted / sourabh
Ans: delta star
In 11kv/440v STEP DOWN TRANSFORMER primary side 3 WIRE{LINE WIRE'S (R,Y,B)} ARE THERE DELTS WINDING USED BUT IN SECONDARY SIDE 4 WIRE{3 LINE WIRE'S (R,Y,B) AND 1 NUTREAL} 120*3=360 angle.
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