Interested to Buy Any Domain ? << Click Here >> for more details...
why is the rating of transformer done in kva and not in kw.
- 21 Answers
- 34935 Views
- Honeywell, Satyam, I also Faced
- E-Mail Answers
Answer Posted / kirti
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 ? | 1 Yes | 0 No |
Post New Answer View All Answers
What will happen if we on 200kvr capacitor bank(11kv in bus)If there is low load on transformer (1.5 mva 33/11 kv)
What are electric motors?
Explain dc generator with its types?
pls tell me function of closing coil of A.C.B.
How to protect a Dosing pumps/any sensitive equipment (single phase) from surge protection inside a food factory.
What is excitation in case of dc motor?
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
According to underground cables a) stress b/w sheath & conductor is high b) inrush of core & conductor
ratings of lightning arrester
i have 3500 amp load and select current transformer and perches.how i calculate .please understand
What is the effect on 3phase induction motor if current setting knob of DOL kept at minimum current?
What are the roles and responsibilities of electrical engineer in cement plant
What is a copper loss or i2r loss pc?
what is the calculation method to design core and winding of a 200kva 3phase distribution transformer?
What is the use of Surge Capacitor in LAVT?
