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Are same transformer be employed for step up and step down
services?
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Answer Posted / bajrang ahirwar
NO
same transformer can't be used for both operations.
exception is ICT like 220KV/400KV
ICT is inter connecting or interposing transformer, these type of transformers are specially designed.
there no load an on load losses ane calculated so that they can be operated from either side.
on the other hand if have a 2000 KVA 11kv/440V 0.85 pf step down transformer:
current in hv side will be = 123 A
and current in LV side will be =3087 A
the secondary has to bear heavy current so it is designed accordingly with Thick winding.
and HV Primary has to carry a comperatively low current so its windings are of thin windings.
NOW the reverse operation
the heavy winding will be connected to high Voltage 11 Kv side, fine no problem, because it has to carry a lower current of 123 A ans secondary is rated for 3500 A approx.
BUT
the thin wired high voltage winding will now have to supplly the larger gurrent 3080 A, this winding has also larger losses R=Rho L/A
result??
the winding will burn out.
so practically it is not possible.
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