Answer Posted / m bhargava narayana

for 0-95% stator earth fault over voltage relay is used,where as 95-100% earth fault(because small amount of third harmonic zero phase seq currents flow through neutral induces small voltage at neutral) under voltage relay is used.

How to calculate loses in transformer of 160 KVA ?

1609

---

WHAT DO YOU MEAN THE DIFFERENT TYPE OF CURVES OF RELAY LIKE STANDARD INVERSE, VARY INVERSE, NORMAL INVERSE, LONG INVERSE ETC....

1908

---

Is it acceptable of installing an earth pit in planters area where bare copper cable, earth rod and connection are susceptible to corrosion due to water?

1892

---

Why can't we parallel the secondary circuits of two voltage transformers?

1438

---

how to calculate maximum current

2271

---

what is v/f control in VFD?

1487

---

why only exciting current is shown not primary current in transformer???

1805

---

Brushes are placed at magnetically neutral axis,when brushes reach that point,the armature conductor gets shorted,but it can be seen that the dc supply is also shorted,wont that get damage? help me plz

2237

---

If short circuit ratio is high is it bad or good for a machine then tell the reason...

1984

---

how do prepare ongc exam.how is it question model.i am electrical. which part covering in electrical.tell me

2209

---

What do you understand by external characteristics of a d.c. Generator?

1062

---

i m in need of current rating chart of heavy duty pvc/xlpe, cu/al cables. can somebody provide me? if yes, plz send me at ashish_patel111@yahoo.com

1965

---

how to put cable sizing and cable glands size for respective cable & Cable Lug size in a DB sectors???

2128

---

How seriving & testing of the HT & LT breakers are done. What are the standard Ir values on which we can come to know the test is passed or failed?

1987

---

What are approaches to tackle sedimentation problem of reservoir?

969

---