Answer / raj

IT IS NEUTRAL DISPLACEMENT RELAY AND IT IS USED FOR VARIOUS
PROTECTION BUT THE PRINCIPLE IS THAT IN CASE OF NO FAULT NO
VOLTAGE IN RELAY ( IT USED OPEN DELTA VOLTAGE FOR RELAY
INPUT ) AND IF FAULT OCCUR IN ANY PHASE THEN UNBALANCED
VOLTAGE WILL GET ACROSS OPEN DELTA FOR RELAY TO OPERATE.

Answer / k.prakashchandra

It could be non-directional relay which is cheaper than
directional relay and used wherever current is not expected
in both directions.

1- What is the Polarization Index number be good for 15KV 3c#500MCM electrical cable? 2- Can I use the IEEE Std 43-2000 to perfom the PI test? Thanks

0 Answers  

---

in communication what is the role of elelctrical engineer?

3 Answers   Quippo, Reliance,

---

my bachelors was done with EEE now i got admit in NU with CS as course. how to answer this qns 1) why u choose cs? 2) why u changed from eee to cs

0 Answers  

---

In synchronous generators field is rotor and armature is stator.Can we take the output at the rotor in case of synchronous generator by the dc excitation on the stator?

2 Answers  

---

How to calcute the cable size for both HT and LT please specify the formula for that Regards Chethan C

1 Answers   Bhel, Student,

---

why we ground the scondary of current transformer.

4 Answers  

---

Can a transformer be used as voltage or current amplifier?

3 Answers   BPDB, REB, Riaz,

---

What is the basic diffrence between Electronics & Electrical engineering

13 Answers  

---

What is the formulae of Megger value for a A.C.Motor

0 Answers  

---

PLEASE TELL ME ABOUT QUESTION PAPER OF UPCL ENTERENCE EXAM.

2 Answers   UPCL,

---

cable tray sizing & selection

1 Answers  

---

what is the purpose that we use PLC system in power system

2 Answers   Glatt, MTS,

---