we convert 66kv to 33kv then 33kv to 11kv,11kv to 440v.why
not we convert directly from 66kv to440v?
- 7 Answers
- 18424 Views
- HCL, L&T, I also Faced
- E-Mail Answers
Answer Posted / shariff
It can be step down from 66kV to 440V,but the problem is
above 33kV power transformers will be in treated as EHV,
and normally they will carry loads in terms 20 or 12.5MVA
etc. then for e.g for 20MVA the sec. current with 440V will
be 20x10E6/440=45kA( Normal rating), where this power
transformer cant be made practically with huge cuurent. So
practically we will go for 66kV to 11kV normally, where
Current is the limiting factor...
| Is This Answer Correct ? | 32 Yes | 4 No |
Post New Answer View All Answers
Where burned of electricity,when,who, & why.
what is meant by flywheel and its role in retardation test
How we can recongnise the phase displacement of transformer connection between primary & scondary...plzzz explain it with example.........
What is corkscrew rule?
What is the rating factor for copper cable ( Specific value according to the type of laying ) & the voltage drop?
When and where resistance earthing is used ? How to calculate the time constant for earth fault
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?
State kirchoff current law?
Difference between earthing & grounding.?
How the over load setting for HT Motors calculated-provided in Numerical Relay
Why we use duplex coil and hook switch in telephone system?
RESPECCTED SIR/MADAM- I AM PRERING FOR SECTION ENGINEER (ELECTRICAL) RRB CHANDIGARH PLEASE SEND ME SOME PREVIOUS YEAR QUESTION PAPER OR MODEL PAPER.MY EXAM IS ON (30- NOVEMBER 2008).I AM VERY THANKFUL TO YOU. FROM- HARENDRA SINGH YADAV
1600kva capacity Transformers how the bucholz relay,Oil temperature,winding,surge relay relays setting are to be done
generally in LT and MV motors we are using 3.5Coresx16,25,35,50 etc cable for supply.although motors is earthed at two point and having all protection.then why we are using that 1/2 core for earthing the motors.while in HT cable we are using only 3core cable for motor supply.generally lt and mv motors are delta connected and ht motors having star connection.whethere it is having any relation with winding connection( star or delta).all motors i am talking about are dol only.can anybody solve my confusion.thanks...
hi friends if you have any 400KV Substation Erection and installations Drgs please send to me.My email id:kandi.suresh441@gmail.com
