Answer / javad ahamad

both e/f relays are different. consider an alternator, its
neutral is earthed through a
resistance inorder to limit earth fault current .then we
cant protect the 100% winding from
differential e/f relay only.because if an e/f occurs at
very near to neutral point the driving
current to operate relay will be very small. there for it
cant be sensed by this method,
we can protect up to 80%(approximate value.depent upon
resistance)only.at this situation
we r providing a restrcted e/f relay to protect the
remaining winding ie 20%.this relay
have very low current setting.by the combination of these
two we can protect 100% winding.

Which is is best option for 33 kv line incomer.I am Desinging the panel for new projects and i would like to get Your opinion on this Vcb or sf6. Please help me with your replies. Thanks D p singh

6 Answers  

---

what is the meaning of harmonic in AC waves and when which are prduce and what is the effects on line and give any other information about harmonics

1 Answers  

---

What is meant by coupling capacitor?

0 Answers  

---

What the methode get earth resistance?

2 Answers  

---

Hi friends, i m electrical engineer i want a cdr for migration purpose so anybody have information about this then send me on jayesh_ee88@yahoo.com.please try to me

0 Answers  

---

---

What is the different between Insulator & Di-electrict?

2 Answers  

---

What are protections for dty type transformers

0 Answers  

---

What are the different protection systems used to protect the transformer internally and externally?

16 Answers  

---

What is C curve and D curve of MCB?

3 Answers   GMR,

---

what is power factor? is it good or bad for a system? what will happen if power factor increase or decrease?

4 Answers   Bhel,

---

If we give the 440 V supply at secondary winding of the transformer then what will affect at primary winding???????

6 Answers  

---

what is impedence in transformer

2 Answers  

---