Answer Posted / bikki

In HT transformer, the primary side has less voltage stress since it is a step up transformer. But the voltage on secondary side will be high and hence the stress will be also high.As a result, the winding insulation requirement will cost a lot if the connection was Delta on secondary side;because in delta phase voltage=line voltage.
But if the secondary connection is star, then phase voltage will be Line voltage/(sqrt(3) which means the winding has to withstand less voltage stress and hence less insulation is required.Hence lesser cost.

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