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Answer Posted / bhaskar halder
D means delta
Y means star
N means neutral
DYN 11 means phase difference between 30 degree HV & LV
side (& vice versa ).DYN 11 TRANSFORMER loss is very low
because phase difference is minimum but it is not use for
higher rating because phase angle is very minimum so HV &LV
side are shrot to each other.so very higher rating use DYN
5 & DYN 6
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