Answer / iamdon

There are mainly three types of power system instabilities

1)Rotor angle instability:It arises due to real power(P)
imbalance.If the situation continues for a long time there
will be mechanical problem with rotor.

2)voltage instability:It arises due to reactive power(Q)
imbalance.If the situation persists for a long time there
will be voltage collapse or Black-out situation within the
system.

3)Frequency imbalance:It is due to power generation
imbalance.If not corrected within the time limit, there will
be islanding of some part of system.

Author:arbelectbit@yahoo.com

Is there any calculation to find unknwon(unferroled) phases R Y B in alternator,3 phase motor anybody shoot my problem. how can we notice this is the respective phase?

3 Answers  

---

diff. between star, delta connection?

4 Answers  

---

why it is in star to delta form of Synchrounus generator and delta to star form of Generator Transformer (or step up transformer)

1 Answers  

---

what is meant by trip circuit supervision & directional or non directional over current ?

1 Answers   ABB,

---

110 KW MOTER DOL STATER 240SQ.MM CABLE MOTER AND STARTER DISTANCE IS 110 METER WHAT IS VOTAGE IN MOTER END AND SYSTEM VOTAGE IS 415 V HOW I CAN CALCULTE

2 Answers  

---

What are the advantages of autotransformer?

0 Answers  

---

One VFD is possible to connect two motors at the same time?

2 Answers  

---

what is L.T?specify the range?

7 Answers  

---

What are the different towers used in 132kv transmission line? what are the differences between the P,R,S towers used in 132KV and detailed explanation

0 Answers  

---

what will happen to give a dc supply in transformers?

3 Answers  

---

what is the use of 6.6kV/6.6kV Transformer???

3 Answers  

---

Why the motor take high starting current for long time(10- 15 sec) which is connected to Blower as compaire with a motor which is connected with pump with same rating?

2 Answers  

---