Answer Posted / vikas

Generally all the Industrial equipments are designed for 3ph
440v & domestic equip. for 1ph 230V so its easy to step down
11KV instead of 33/66KV to minimise cost of equipment as
well as losses.
Moreover for transmission of longer
range Voltage has to step up to minimise transmission losses
due to I^2R .and again has to be step down to reduce the
operating cost of equipment.

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