Are same transformer be employed for step up and step down
services?
- 3 Answers
- 6297 Views
- I also Faced
- E-Mail Answers
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.
| Is This Answer Correct ? | 2 Yes | 0 No |
Post New Answer View All Answers
I HAVE BEEN SELECTED FOR APGENCO A.E(ELECTRICAL) 2008.HOW MUCH WEIGHTAGE FOR INTERVIEW AND WRITTEN TEST.HOW I HAVE TO PREPARE. PLEASE GIVE INFORMATION IF U KNOW.WHAT ABT G.D THIS TIME.CALL RATIO 1:2
please send me previous year questions of jspl through which i could prepare myself for the test.
Can you used moeller lzm1 mccb in a dc system with 125vdc and 20ka short circuit current , beside is it have 24 or 48 volt shunt ? Beside how long current can through from An MCB shunt contacts? (like Z7-AS 24 V)?
Why squirrel cage motor can only use with low starting loads ?
XYZ
WHAT IS THE MEANING OF BALANCED / UNBALANCED IN STABILIZER TYPES.
Don't you have similar question banks related to Oral Certification Examination conducted by Mercantile Marine Departments / Directorate of Shipping, Ministry of Shipping for Electro Technical Officer?
why and how voltage sharing in transformer, during magnetic balance test ?
pls,send the previous year written test questions.
Draw a SLD for main panel for school having connected load of 1200kw and emergency generator 200kw.also show the increase of additional load of chiller 225kw in the lv panel indicating meter postion size of transformer ,cables and capacitor bank.
I am shobana from Chennai. I am having my personal interview on 19th Dec at Chennai.kindly mail me the questions to mail id shobana.shanthi@gmail.com
What products have you designed which have entered high volume production?
What the main causes of transient interruptions on Over-Head Distribution Lines?
If not into production, how far did you follow the design and why did not you see it into production?
sir pls send the je exam - 2008 and other model question papers..
