Answer / arun.giit

as all the losses is in the form of power;and in transformer
iron loss is directly propertional to voltage(V) &copper
loss is propertional to current(I).it is not depend upon
powerfactor,so it's rating is in KVA.

Answer / shaikh

Cu loss of transformer depends upon current I and iron loos
depends upon voltage V...So as we can say that the total
losses of the transformer depend upon VA (volt-ampere) and
independent of phase angle between V & I (i.e. pf
angle)...so transformer rating is in kVA & nt in KW...

Answer / tin`

Becuase kVA is the 'total' apparent power. The load
connected to the transformer can have different power factor
(pf) and so the kW rating will vary according; kW=kVA*pf.
The transformer rating is stated in kVA in order to show
the full capacity of the transformer and then the real
power (kW) rating can vary with power factor.

Answer / salim

bcz
kw=kva×pf and load on tranz.is not constant.So pf is varies with load.thats why traz.rating is always in kva not in kw

Answer / mohan singh

Transformer ratings are in KVA because the power factor is
for the load on which transformer will operate is not known
in manufacturing and KW = V x I x Cos Phi.so it is Rated in
KVA and not in KW.

Answer / peter

coz KW or HP makes no sense.....transformer is not a power
conerter involving mechanical energy.....i mean...it just
transfers electrical energy ....

Answer / bob

Because transformer is power source and active power and
reactive power drawn from it depend on load nutural.

Answer / suresh

Because transformer have electrical output

what is formula to cal cute earth pit numbers and size of earth strip used in earthing?

0 Answers  

what is tandem isolator ??????????

5 Answers  

X is a uniformly distributed random variable that takes values betweeen 0 and 1.The value of E {X3}(x cube) will be.

1 Answers   GATE,

Why 36 KV LA is used in 33 KV Line and 9 KV LA is Used in 11 KV Line

1 Answers   APTransco, Bhel, Wipro,

ht side line to earth voltage

0 Answers   JLL,

What is High Frequency Grounding????

2 Answers   Emerson,

An input device is interfaced with Intel 8085A microprocessor as memory mapped I/O.The address of the device is 2500H.In order to input data from the device to accumulator,the sequence of instruction will be

1 Answers   GATE,

Please explain how to do 'tan-delta test' on AC generator? and where i get clear and brief detail, give any web page address.

1 Answers  

What should be the overcurrent, instantaneous overcurrent, short cicuit current settings (i.e. how many times of motor full load and what is the time duration) for a motor?

1 Answers  

how we can calculate power factor in single phase & three phase ?thank u

0 Answers  

What is meant by Energy Efficient Transformers??? give significance

1 Answers   MahaGenco,

Dear sirs, pls check this 4-20ma to RS485 module datasheet,pls guve me some suggestions. http://www.szsunyuan.com/sy/pro_more.asp?Productid=539 Thanks. E-mail:yunianjiang99@gmail.com

0 Answers