Comparison between
star and Delta connection :-

1. In
   star connection similar ends are joined together where as in delta
   connection dissimilar ends are joined together.
2. In
   case of star connection, line voltage is √3 phase voltage
   whereas in case of delta connection line voltage is equal to phase
   voltage.
3. In
   case of star connection line current is equal to phase current whereas
   in delta connection line current is equal to √3 phase current.
4. In
   case of star connection it is possible to carry the neutral wire to the
   load whereas in delta connection it is not possible.
5. All
   distribution transformers are Delta/Star connected whereas power
   transformer are Delta/Delta connected.