Answer / mohd. karim

KVAR - Reactive Power
It's Present only in Inductive load, i.e. X-mer, Motor, X-
mission Line..etc

And This power is required for generating Magnetic field in
inductive load.

Here, i want to explain some formuls

KVA = Sqrt((kw)^2 + (Kvar)^2)
Where , KVA = Apparant Power
KW= Actual Power
Kvar= Reactive Power

PF=KW/Kva = KW/(KW+Kvar) = COS$

1. If the value of kvar is more. it means PF is Less.
2. If the value of Kvar is zero. It means Unity PF (PF=1).
it means Apparant Power is Maxi. and over KW Loading is
Maxi.

--> Practically PF is not Unity (PF=1). its near about One.

For Reducing Kvar Demand We install Capacitor In Ckt.

Dis-Advantage (If Kvar is More)

1. less KW Loading(Low load Allow) in system.
2.Power Factor will Poor.
3.High current in system so Conductor & Cable size increase.
4.Electricity bill will more (Money Loss)

Answer / pradeep

kvar is nothing but the reactive power which is injected by
the capacitor bank. this power is similar to the real power
which generated by the generating unit.

by using capacitor bank we reduce losses like transmission
loss etc.,

advantages:
1. easy to convert the 2-phase into 3-phase.
2. reduce the losses and increase the efficiency.
3. it ensure upto 200Mhz

disadvantages:
1. it will inject the more power when bank is not necessary.
2. expensive due to connecting the capacitor bank.

How much costly in percentage wise is sandwich busduct costly than air insulated busduct of any rating?

0 Answers  

---

1.What is effect of capitance in transmission line? 2. After raising the voltage at receiving end what will be happen? 3.how we nullify or control the raised voltage at receiving end?

3 Answers   NTPC,

---

how can a transformer test by megger?

1 Answers  

---

What is CRT (Contact Resistance Test) for Isolators or Dis- connector Switches? Why we performed it & whats the Testing procedure.

1 Answers   Siemens,

---

Why not instal the NGR in 11kv/433kv trasformer?

3 Answers  

---

---

What is the difference between reverse power trip & inadvertant trip?

1 Answers  

---

what's the meaning of the negative going half cycle in the circuit containing a bulb and a switch in series with a input ac source. i mean what happens in the -ve cycle. the dir. of current changes or any other thing. if dir. changes then why we use fuse in only phase wire.

2 Answers  

---

rajha power sector details

0 Answers  

---

what is active power & reactive power?

0 Answers   Avtech, Jindal,

---

why the the phase transformer's nuetral has been grounded

2 Answers  

---

For the same power rating,which motor is bigger in size,AC or DC?

9 Answers   Bhel,

---

(1)Can earth and be conected together (2) what is the diferent between earth & neutral

0 Answers   VACC,

---