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.

Which type of transformer is used for lighting loads?

0 Answers  

---

why lightning arrester and other equipment earthing conneting from same earth bar ?

1 Answers  

---

why do we connect droop ct{in gensets}in y_phase only

2 Answers  

---

we have provided 30 nos. relay contacts in panel.I want to know how do we do the numbering for the relay contacts as per any applicable standards

0 Answers  

---

What is Meant by Load factor in Power plant?

2 Answers   ABB, Electrical,

---

What is master trip relay? How does it work?

1 Answers  

---

What will be happend if we not ground CT secondary?

3 Answers   Enercon, Engro, THDC,

---

how can we calculate the reactence of the current transformers?

0 Answers  

---

In an ideal transformer no load primary current I0 A lags behind V1 by 90 degree B is in the phase with V1 C leads V1 by 90 degree D lags V1 by 45 degree

1 Answers  

---

what is two wattmeter test

2 Answers   Jindal,

---

define bilateral network and unilateral network? give an example.

3 Answers   ABB,

---

how to convert psi into kilo pascal? what is the suction pressure & discharge pressure of chiller?

1 Answers  

---