Interested to Buy Any Domain ? << Click Here >> for more details...
Why Transformer in KVA?
- 41 Answers
- 89556 Views
- APCPDCL, Apollo Power, College School Exams Tests, Electrical Tech, Hitech, HP, L&T, MDL, Oil and Gas Jobs, TATA, I also Faced
- E-Mail Answers
Answer Posted / pankaj rajput
The copper loss of a Transformer depends on current i.e.
I^2 R and the iron loss depends on voltage. Hence the total
losses depends on volt-ampere (VA) and not on phase angle
between voltage & current.
Therefor the losses in a transformer are independent of
power factor which is cosine of angle between voltage &
current.
That's why the rating of transformers is in KVA and not in
kW.
Now coming to Efficiency of a transformer: Yes it depends
on power factor of load. Because the
Efficiency = Output/Input
= (Input - Losses) / Input
= 1 - (Losses / Input)
= 1 - [Losses / (Vs * Is * Cos phi + Losses)]
Efficiency is inverted V curve (Y-scale) and the peak of
curve appears between 50-60% load (X-scale)for various load
power factors. Efficiency increases as the power factor
increases.
| Is This Answer Correct ? | 23 Yes | 6 No |
Post New Answer View All Answers
how to calculate short circuit current for the busbar
what is the working principle of a DG Set, Alternator, & exiter
What is the general system requirement of alternator?
The transmission does not have options: a)Partition noise b) Flicker noise c) resistance d) Short noise and reason
When we use 3 terminal resistor?
what is the difference between c power and U power acb breaker
technically, what is the reason behind starting the motor star the delta connection .. and what other ways to do this rather than using " star-delta transformer"
What is the difference between voltages or potential difference? And what are they?
what is sustainable current of any conductors . a bare busbar or pvc cable has different sustainable current .
I am interested to know what does 15 KVA DG set actually means? If I dont know the DG rating, is it possible to identify KW by simply knowing the diesel consumption?
how can you calculate fault level ?
we use 400/5A ct and 35/roor3KV,/0.1/root3KV,0.1/root3KV pt ratio. What is the multiple factor of this meter.
what is the working process of over & under voltage relay.
in shunt clippers why a resistor is used in sereis with the input
PLEASE SEND THE PREVIOUS YEARS QUESTION PAPERS OF RRB JUNIOR ENGINEER-ELECTRICAL
