Answer / suhas

after generating voltage, it has to be transmitted....to
transmit we use delta connection as it needs only 3 wires
which saves money...steppin up of voltage is done to
decrease losses in transmission...so step up transformer
has Y-del connection...in the receiving end(step down) we
can use del-del or del-Y...by using del-Y connection we hv
d flexibility of selecting the 3 phase and 1 phase
voltage... this method is done usually for
distribution...for further transmisssion, in swithing sub
stations, the step down trafo will be del-del....with
tertiary as star.....

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