why transformer rating in KVA or MVA instead of KW n MW??

Question Posted / guest

3 Answers
14639 Views
I also Faced
E-Mail Answers

Answers were Sorted based on User's Feedback

why transformer rating in KVA or MVA instead of KW n MW??..

Answer / rashid abdul rab

W= voltage*current*power factor
But in practical we are not well aware of the type of load
(power factor)to be applied on transformer. So we give the
ratings in KVA only

Is This Answer Correct ?

20 Yes

2 No

why transformer rating in KVA or MVA instead of KW n MW??..

Answer / mohamed iqbal

There are 2 losses in transformer. One is copper loss which depends on current and the other is iron loss which depends on voltage. These two factors are not affected by the power factor. This is why transformers are rated in KVA and not KW. Single phase KVA = Amps x Volts/1000. Single phase KW = Amps x Volts x pf/1000. 3 phase KVA = Amps x Volts x 1.73/1000. 3 phase KW = Amps x Volts x 1.73 x pf/1000

Is This Answer Correct ?

16 Yes

0 No

why transformer rating in KVA or MVA instead of KW n MW??..

Answer / anu

In transformer the copper losses are due to current and
iron losses are due to voltage. so that the rating of T/F
is in KVA instead of KW.

Is This Answer Correct ?

9 Yes

3 No

Post New Answer

More Electrical Engineering Interview Questions

If the Brsh of DC motor is shifted by 90 deg, then MNA will shift by --degree.

5 Answers GATE,

Does increase or decrease of reactive load affects the Voltage.

5 Answers Nalco,

why output is out of phase in case of common emitter?

0 Answers

what happen if we supply 220v dc suppy to the bulb or tube

2 Answers

I have a question, I visit 01 site and face a problem, there is 2.5 ton Air Con working, when air con compressor is running at that time rectifier voltages are increasing upto 290-295 v and rectifier is giving main high alarm (rectifier is APC single phase, before starting compressor rectifier voltages was 230v. when air con is going off rectifier voltages are decreasing smoothly at its actual voltages 230v. Load on Genset phases is this: Red-13.5 amp AC (Air Con load), Yellow-1.7 amp AC (BTS lights etc.) and Blew-4 amp AC (telecom system load), Genset phase to phase and neutral to phase voltages are also ok. These are 10 sites having same system and same rectifier APC brand at every site 02 genset are working but the problem is same at all these 10 sites. What will be the reason behind???

1 Answers

What is difference between insulating medium and fault current interruption medium in a switching device.

0 Answers

i want to apper for apgenco or aptransco or related can any one sugest me where can i get previous papers of thouse exams

0 Answers

What is Electricity?

2 Answers

Can u Explain about the electronic trivector meter and the use of data converters in them?

0 Answers Tricom,

how to calculate current carrying capacity in power cable?

1 Answers

What is phase angle? and what is importance to measure it?

2 Answers

In synchronous generators field is rotor and armature is stator.Can we take the output at the rotor in case of synchronous generator by the dc excitation on the stator?

2 Answers

For more Electrical Engineering Interview Questions Click Here