Answer Posted / madhu

c is capacitor connected.
In delta connecton,
source 3ph grounded star,
Q(per phase)=(omega)*(3*c)*V^2

In star connecton,
source 3ph grounded star,
Q(per phase)=(omega)*(c)*V^2.

so with low value of c we are able to supply more reactive
power in delta than in star.

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