Answer / vivek

in a synchronous machine , there are three kinds of impedences

1. Xd - synchronous reactance ; (used in steady state
modelling )
a special case is salient pole machines where sync impedence
is split into direct axis impedence and quadrature axis
impedence , ie Xd and Xq . see double reactance theory for
more details
2. Xd' - transient reactance ;(used in transient modeling)
3. Xd'' - subtransient reactance .

all other machines have three kinds of impedences which are
used in power system modelling
1. positive sequence impedence
2. negative sequence impedence
3. zero sequence impedence

Answer / r

for a syn machine - syn impedance
fictious impedance
load impedance
normal case - input impedance
output impedance
transmission lines- surge impedance
load impedance

Im designing APFCR Panel for 600 KVAR.I need to calculate the full current so that i can choose the capacity of isolator/Breaker.Kindly suggest with formula.

1 Answers  

---

what is the difference between RTD & TERMO COUPLE?

1 Answers  

---

what is mean by xlpe cables?

3 Answers  

---

what main difference betwenn invetter & ups & major difference

2 Answers   ABB,

---

what is different between DIGITAL and ANALOG?

3 Answers  

---

Whether it is possible to measure energy at the input of rectifier transformer (12 pulse with very high odd harmonics)

0 Answers  

---

If current and resistance in a circuit is increased by 20%, what will happen to its voltage drop??

4 Answers  

---

why the voltage level is changed when the unearth cable is earth

2 Answers  

---

how does an energy meter works?

4 Answers  

---

what is meaning of bus raiser???

1 Answers  

---

What is the function of trip neutral close switch?

11 Answers  

---

How can a equal potential zone be carried out in conductors?

0 Answers  

---