Interested to Buy Any Domain ? << Click Here >> for more details...
why transformer rating is expressed in kva.
- 4 Answers
- 10044 Views
- Electrosteel, L&T, I also Faced
- E-Mail Answers
Answer Posted / nitiniitp
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 ? | 26 Yes | 0 No |
Post New Answer View All Answers
What Is Sampling?
can you send me the placement papers of electrical engg. from companis like NTPC,DRDO,IOCL,HPCL,BPCL etc.?If,plz send as soon as possible.Thanks.
design a LV scheme for a 15 storied building?
how to remover corona effect and hysteresis losses from contactor
What are the advantages of thermal power plant?
what is the benefit of floating our DC source? if i have two floating DC source of which 1 has a ref voltage of -21VDC and the other of -18VDC. can it be connected in parallel to share a common ref voltage? if not, how do i make both sources to be of common ref voltage? tks
difference between a diode and thyristor?
the winding of Generator and Motor is star or in delta ? and why
how you will decide the distance between the power transformer and its fencing
how to calculate IR value of 33KV cable ??
dear all i am kumara now current working in electrical designing of control and relay panel i want learn some substaion design then any book are available. pls mention name and authour
What are n circles?
Define de-sensitivity?
th how could we differentiate between armoured copper and armoured aluminium cable what is the basic application? why we prefer the armoured copper as compared to armoured aluminium.
what is automatic voltage regulator?we can control the vlotage by using fuzzy controller in matlab?why we go for fuzzy?
