Interested to Buy Any Domain ? << Click Here >> for more details...
Answer Posted / 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.
| Is This Answer Correct ? | 9 Yes | 2 No |
Post New Answer View All Answers
Define resonant peak?
Meaning of ingrace protection for motor.for ex IPXY
What is servo motor and what are the applications of servo motor?
how to electronic energy metter failed in electomagnectic fild passing in the metter and which thing to defect more on metter.
IN dc capacitive reactance is??
how does directional relay work incase of ac ?
What is load boxes ?
What is thresh hold value of current?
Is there a diode made that works with AC 120 volt 20 amp? If so can it completely stop all current flow in 1 direction at all times?
Why can't we parallel the secondary circuits of two voltage transformers?
what reactive how to maintain
Why water bubbles when D.C. Current is passed through it? Why not when A.C. Current is passed?
What is meant by coupling capacitor?
when the Transmission and Distribution network where is the "feeder" lines are located? and why should be used in T&D network.....
What is the de rating factor of cable? What is the importance of the de rating factor in cable selection?
