Answer Posted / n. vajiravel

in case of star-delta trafo
if you apply single phase supply on primary 1u-1n then the
voltage should be divided to 1v-1n(70%) and 1w-1n(30%).
this result shows the correct magnetic coupling between the
windings.
example:
apply single phase supply to 1u-1n----100%(230v approx)
measure voltage in 1v-1n and 1w-1n then you will get
70% of 230V in 1v-1n and 30% of 230V in 1w-1n approximately.

apply single phase supply to 1v-1n-----100%(230v approx)
measure voltage in 1u-1n and 1w-1n then you will get 50% in
each.

apply single phase voltage to 1w-1n-----100%9230v approx)
measure voltage in 1u-1n and 1v-1n then you will get 30% of
230v in 1u-1n and 70% in 1v-1n approximately.

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