Answer / rockyxyz

if i am correct NGR is Neutral grounding resistance. NGR
are used to restrict the earth fault current during fault
condition below a certain value. this is done for high
voltage genertors coz due to high voltage & low windng
resistance fault current is very high and the windings are
not designed to carry such a large current so it is the
place where NGR comes to play

Answer / mahadeva annigeri

NGR USED IN 11KV GENERATING STATION IS TO LIMIT THE FAULT CURRENT WITHIN THE SPECIFIED LIMIT,Ex: AS PER FORMULA I=V/R,V=11KV.R=63OHM.SO 11000/1.732/63=100A,NGR WILL CONTROL UP TO 100A ONLY BECAUSE GENERATOR IS CONNECTED WITH GRID (SYNCHRONIZED CONDITION)HEAVY FAULT CURRENT MAY OCCURED IN LINE,THAT FAULT CURRENT MAY DAMAGE WINDING INSULATION THATISWHY NGR IS USED TO PROTECT THE GENERATOR FROM HEAVY FAULT CURRENT.I THINK SO

Why we have short circuit the secondary of the transformer

1 Answers  

---

r we are using in gas turbine mark (5) frame (6) (made in india Bhel 1997) Ā

0 Answers  

---

how to select electronic timer(Star-Delta) setting for diff. rating motors

0 Answers   Getrag Ford Transmissions,

---

The power dissipated by a resistor of 10ohm when a current of 2A passes through it is:(a) 0.4W(b) 20W(c) 40W(d) 200W

2 Answers  

---

Why red,yellow,green colours lamps are used in the traffic control?

2 Answers   Samtel,

---

---

How would you supply power to a village which is very far from a sub-station and has only a 11kV line running near by?

3 Answers  

---

how to calculate the megger values for motor, cables and transformers?

2 Answers   ITC Infotech,

---

can we use the 110 v primary Tr 240 v secondary step up Transformer as reverse 240 pri 110 sec

3 Answers   Hyundai,

---

how many BUSBAR is in electrical system?

3 Answers  

---

Explain the advantages and disadvantages of thermal power plant?

0 Answers  

---

which site/city in India has all three(thremal,Hydal and Nuclear)power generaton facilities?

2 Answers  

---

Why control of DC motor is simpler?

0 Answers   BARC,

---