Answer Posted / kiran

It is not advisable to step down directly for following
reasons.
a) If insulation between 33kV and 415V winding fails, then
before triping, for a fraction of second 33kV high voltage
will get connected to 415V system, on which vast users &
equipments are connected.
b) Fault level on 33 kV is more, hence if fault occures on
415V bus side, heavy kA fault current will flow as compared
to 11kV/415V transformer.


But nowadays, 33kV/415V transformers are widely used to
avoid double transformers

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