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

why are the a.c.series motors preferred for electric traction

4 Answers  

---

why transformer cannot rotate though the princplebehind induction motor is similar to a transformer?

2 Answers   GE,

---

1) How to calculate battery backup for ups as well as solar with complete formula elaborately......

2 Answers  

---

iam working as a electrical engineer. i want to know about any license or certificates regarding my field. for my carrier and ti improve the knoweledge.,,, how we get that..and what procedures......... pls help me

1 Answers  

---

How the starter control the starting current in three phase AC Motor?(In DC apply the reistance).

6 Answers  

---

what is the Transformer Impedence?How can calculate?

0 Answers  

---

What current position are you holding in your current company?

0 Answers  

---

While testing the value of the resistance for the earthing rod, two auxillary rods are connected to the earthing tester.What is the working function of a earth tester?

0 Answers  

---

What is the difference between Relay and Contactor

35 Answers   Siemens,

---

Distinguish between nuclear power station with thermal power station for initial cost, starting period, cleanliness, and transportation of fuel

0 Answers   IOCL,

---

if grounding is notdone at regular intervals for long distance transmission, will the load connected at distribution end receive voltage during negativehalf cycle of the sine wave?

0 Answers   First City,

---

seromechanism

4 Answers   Bhel,

---