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