Answer / md0711

All electrical devices that supply power are usually rated in kVA. but generator put supply power in kVA because KVA is "apparent power" which does not take an account of power factor and KW is "true power". They generated own power factor
like :
VA = E X I
W = E X I COS PHI

Answer / shelleymuston

All electrical devices that supply power are usually rated in kVA. This includes transformers, UPS's & the like.

Simply put, the difference between kVA & kW is that kVA is "Apparent Power", which does not take into account the Power Factor & kW is "True Power" . See the below equations:

VA = E x I
W = E x I x Cos phi

The above equations are only for single phase.

When a manufacturer makes a transformer, generator, UPS etc, they have no idea of the type of load that will be used & consequently can only rate the device according to its maximum current output that the conductors can safely carry (at untiy Power Factor) & the insulation rating of the conductors (voltage & temperature).

Answer / dave mudra

The power √3 VL IL Cos φ delivered by the alternator for the same value of current, depends upon p.f. (Power Factor=Cos φ) of the load. But the alternator conductors are calculated for a definite current and the insulation at magnetic system are designed for a definite voltage independent of p.f. (Cos φ) of the load. For this reason apparent power measured in kVA is regarded as the rated power of the alternator.

What is cable tray, its type, and its support?

0 Answers  

---

How to calculate capacitor bank size at a load 800kVA.

0 Answers  

---

What is the necessary condition for stability.

0 Answers  

---

Explain why the Voltage drop will happen in 3 Phase line?

3 Answers  

---

inductance and capacitance may result in periodic reversals of the direction of energy flow,how???

1 Answers  

---

two way ckt diagram can be drawn by how many ways? give diagram

0 Answers  

---

how the capacitance is caluclated if the load is varying to keep the power factor constant(above0.95)

1 Answers  

---

Define current?

14 Answers  

---

Can a transformer designed for a particular voltage and frequency rating be used for different set of mentioned ratings? Assume that the winding does not get burnt because of overheating at higher voltage. If yes, then under which constraint it is possible?

1 Answers  

---

what effect on electrical equipment if PF is gone over 0.996 in leading when provider say that its keep in minimum 0.996lagging

3 Answers   ABB,

---

ALL HT /LT PANEL TEST? DISCRIPTION.

0 Answers   Essar,

---

tell me the various standerd of CT ratio

1 Answers   ICA,

---