why transformer rating comes in kva?

Answers were Sorted based on User's Feedback



why transformer rating comes in kva?..

Answer / rutulsoni

there is two types of losses occured in transformer which are copper loss and iron loss.Copper loss is always  measured in ampere and hysteris loss measured in voltage so its rating comes in KVA. 

Is This Answer Correct ?    9 Yes 4 No

why transformer rating comes in kva?..

Answer / ep

Transformer rating comes in KVA not in KW, because - there are two types of transformer losses (Copper losses and Iron losses). Copper loss depends on current and Iron/Core/Insulation losses depends on voltage. Hence, total losses are dependent on amp-volt (VA), not on phase angle between current and voltage. It means losses are independent of load power factor (cos phi).
That's why transformer rating comes in KVA not in KW

Is This Answer Correct ?    3 Yes 1 No

why transformer rating comes in kva?..

Answer / kothandaraman

Because of transformer there is no lagging and leading current vector with reference to voltage vector. PF means the cosine value of the angle difference between voltage vector and current vector. If current vector lags the voltage vector, it is lagging, for example inductance type of loads, i.e motor. If current vector leads the voltage vector, it is leading, for example capacitance type of loads, i.e. capacitors and synchronous motors.

Is This Answer Correct ?    1 Yes 0 No

why transformer rating comes in kva?..

Answer / sagar

the transformer rating is in KVA because manufacturer dont know the Load Power factor thats why they specified it in KVA which is nearly Permanant losses

Is This Answer Correct ?    1 Yes 1 No

Post New Answer

More Electrical Engineering Interview Questions

what is the formula to calculate the fuel consumption of a diesel generator at different diferent load.

4 Answers   Aegis, Network Clothing Company,


what is the disadvantage of leading power factor...why can't we use it (pf=0) for a long period of time?

10 Answers   Appco, snsce,


what is tha online tapping and offline tappchange? which side connected primary or secondary and explain ?

4 Answers   Essar,


What is the function of automatic Transfer Switch(ATS) in details

3 Answers  


what is RFID? thire application;

0 Answers  






how to calculate voltage drop and followed by cable calculation?is there avail in formula?

0 Answers  


what happens in the short circuited secondary transformer,if the resistance of the short circuit is increased gradually?

0 Answers   IIT,


3ph motor running with unequal kw and different pf what are the reasons

0 Answers   UltraTech,


What does the letter CTNM in negative phase sequence relay means?

0 Answers  


How to protect the water pump by no load running.

9 Answers   Cushman Wakefield,


what is cogging and crawling

0 Answers   Suzlon,


why we are not earthing ht cable at both the ends(sending & receiving end)?

5 Answers   Essar,


Categories
  • Civil Engineering Interview Questions Civil Engineering (5084)
  • Mechanical Engineering Interview Questions Mechanical Engineering (4451)
  • Electrical Engineering Interview Questions Electrical Engineering (16631)
  • Electronics Communications Interview Questions Electronics Communications (3918)
  • Chemical Engineering Interview Questions Chemical Engineering (1094)
  • Aeronautical Engineering Interview Questions Aeronautical Engineering (239)
  • Bio Engineering Interview Questions Bio Engineering (96)
  • Metallurgy Interview Questions Metallurgy (361)
  • Industrial Engineering Interview Questions Industrial Engineering (259)
  • Instrumentation Interview Questions Instrumentation (3014)
  • Automobile Engineering Interview Questions Automobile Engineering (332)
  • Mechatronics Engineering Interview Questions Mechatronics Engineering (97)
  • Marine Engineering Interview Questions Marine Engineering (124)
  • Power Plant Engineering Interview Questions Power Plant Engineering (172)
  • Textile Engineering Interview Questions Textile Engineering (575)
  • Production Engineering Interview Questions Production Engineering (25)
  • Satellite Systems Engineering Interview Questions Satellite Systems Engineering (106)
  • Engineering AllOther Interview Questions Engineering AllOther (1379)