Answer / krishna rao vutukuru

distance protection can be done in 3 ways by measuring
1)impedance method(impedance relay)
2)reactance method(reactance relay)
3)admittance method(mho relay)

reactance relay used for detection of earth faults(since it is indepedant of ground resistance)

mho relay is used for protection of long transmisson lines(since it is less affected by power swings)

impedance relay is used for protection of medium lenghth transmisson lines.

Answer / nirujogi suresh

reactance relay is less affected by power swings as it is response to only for grounded faults

how to calculate the cable size for 500 kva transformer?

3 Answers  

---

What is current chopping in CB?

1 Answers  

---

What is the difference between XLPE & FRLS cables? Is FRLS cables is a type of XLPE cable or both r different?

5 Answers  

---

How can eliminate noise problem inside temperature controller temp. variation due to contactor chattering problem.

0 Answers  

---

Why we use Electrical energy rather than any other type of energy, mostly? Explain behavior of open secondary CT and short circuited secondary PT in energized condition?

0 Answers  

---

---

why mosquito bat makes noise when it hits with a insect?

2 Answers  

---

'documenˁ

0 Answers  

---

how to calculate cable size in diffrent loads?

0 Answers   ABB, Sterling,

---

Why the standard of ambient teperature mentioned as 40 degree celcius in machines.

0 Answers  

---

What is C check in a diesel generator and what are parts and what has to be done during the C check

4 Answers  

---

how to calculate transformer turn primary & secondary side 11kv to 420v

0 Answers  

---

what is protection class current transformer.

1 Answers   Matrix,

---