Advantages Of Using Ht Motors(6.6kva)/3.3kva Vs Lt Motors(440v)

I want to know the advantages & disadvantages of using HT motors(6.6KVA)/3.3KVA Vs LT motors(440V).

Our Incommming power Supply from State Electricity is 440VAC.Our technical team suggest to put 6.6KVA motor for Air compressor application.

We have total requirement of 2000NM3/hr.

So we need compressor of @ 1000Kw.

What are the problem we can face if powered through common 33KV -440V Stepdown Transformer assuming I will use soft Starter.

Differentiate in respect of

1) Transformer Losses.

2)Starting current Loss.

3)Cable Size & losses

4)Cost difference involved in HT & LT cable.

5)Effect on Power Factor.

6) Additional Transformer losses if power is sourced from DG in case of power failure.

Can any body elaborate saving by calculations in details by experiance.

Dhanvant