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.

plz send me Bhel, Mahagenco, sbi previous exam paper for electrical engineer on my email-id kambali_smita@yahoo.co.in

0 Answers   Bhel,

---

what is the value of current and voltage that our body can resist ?

3 Answers  

---

What is meant by Floating Neutral? how to prent

7 Answers  

---

What is big transformer parts and their function ? Ty

0 Answers  

---

Why is a synchronous motor always star connected??

0 Answers   Bhushan Power Steel,

---

---

Why synchronous motor is used in power factor improvement,dc series in lift

0 Answers  

---

what is the difference between the alternator used in hydro and thermal power plants??

2 Answers  

---

What are the effects of adding a zero to a system?

0 Answers  

---

what is the maintaining Cf in UPS.

0 Answers   Enercon,

---

How do i perform grounding of star point of Genset (400V) for making connection with step up transformer of DELTA-DELTA (400V to 20KV) ? while Genset itself has its own neutral and grounding bus bar inside genset breaker box whereas we have another neutral and grounding busbar in synchronizing panel next to genset at maximum distance of 6meter, would someone pls advice if we can only perform neutral grounding in synchronizing panel or should we ground neutral on both places inside genset breaker box and synchronizing panel.

0 Answers   Allied Group,

---

Can anyone explain, How will get positive to ground and negative to ground reference voltage in dc system

1 Answers   NCC,

---

What is the function of auadag in a cro?

0 Answers  

---