Answer / prashant

As the losses of Transfomefer depend on VA characteristic
(copper loss on current & iron loss on current).So the
total loss depend on VA characteristic & power factor doses
not play any role.so rating are given in KVA not in KW.

Answer / raja

kVA is the unit for apparent power. Apparent power consists
of active and reactive power. Active power is the share of
the apparent power which transmits energy from the source
(generator) to the user. Reactive power is the share of the
apparent power which represents a useless oscillation of
energy from the source to the user and back again.

It occurs when on account of some inertia in the system
there is a phase shift between voltage and current. This
means that the current does not change polarity synchronous
with the voltage. But the heat generated in a winding as
well as the eddy current losses generated in a transformer
core depend on the current only regardless of whether it
aligns with the voltage or not.

Therefore the heat is always proportional to the square of
the current amplitude irrespective of the phase angle (the
shift between voltage and current). So a transformer has to
be rated (and selected) by apparent power.

Answer / bhavana

the losses of transformers are
1.iron loss
2.copper loss
the iron loss depends on the supply voltage & copper loss
depends on the current. but these two losses does not depend
on the phase angle between the voltage and current. hence
the ratings of transformer is expressed in terms of product
of voltage and current i.e VA rating. it is not expressed in
watts or KW. it is mostly expressed KVA.

Answer / ashok mishra

transformers are rated in kva not kv
ur question is wrong

Answer / sethu

Transformer is give to primary voltage then output take to secondary supply, so transformer mension to kva.

Motor only take the power supply, so motor mension the kw

Answer / bijendra chhetri

because transformer is not rated in kv is smalest and kw is
bigers ones.

i seen a 132kv/11kv transformer,and thier is a sugar factorys 10MW EXPORT PLANT,MY QUESTION IS THAT WHEN THEY EXPORT ELECTRICITY THEY USE THE SAME TRANSFORMER AND THE CONNECT IT TO 132/11KV TRANSFORMERS SECONDARY SIDE CAN ANY ONE EXPLAIN IT.. THE TRANSFORMER IS OF KIRLOSKAR MAKE AND IT HAS TAP CHANGER.

1 Answers  

what is the name for a meter/tester to measure the paint quality in electrical panel or wall?

1 Answers  

In transmission line the line power loss only accured at resistance the inductance and capacitance wont consume power is it correct?

2 Answers  

In star and delta connected systems , for driving power and as well as light load which one you will preferred?

2 Answers   Aramco, IBM,

how we can explain arc heatng?

0 Answers  

The temperature rise in the sys, which leads to ….. a) Increases stress& length b) increases stress but decreases length c) Decreases stress & increase length d) decrease stress & length

1 Answers   Engineers India Limited,

Hi guys! Plz help me to answer the following questions. 1. What are the types of transmission line energy losses? 2. Why are the VLF are used some types of services? 3. What frequencies are used for reliable beyond the horizon terrestrial communication without repeaters? 4. To permit selection of 1 out 16 equi-probable, what is the number of bitis required? 5. What is the most common modulation used for telegraphy? 6. What is the multiplexing is used to increase the capacity of the optic fiber? Thanks

0 Answers  

Why inverter rating in KVA?

3 Answers  

we done magnetic balance test for 33KV /440V transformer in our company , but the ratio out is confusing us Voltage applied in RY = 440 , at RB = 320 and YB = 60 RY 440 = ( RB + YB ) 380 only Please let me know what type of problem is it.

2 Answers  

What is current chopping in CB?

1 Answers  

while calculating the power absorbed by a resistor connected to the output of a half wave rectifier circuit should we use rms or average current? explain with reason.

1 Answers   Vedanta,

i want to know how to determine that a surge arrester work properly in 11kv system. and how to test a 12kv surge arrester

0 Answers