Answer / a.p.nanjappa

Nothing happen. DC ground fault alarm persists. Generator
works as usaual.a single dc earth fault will not damage the
device.Just annouces there is weak insulation, trouble
shoot it. rotor is a dc circuit.
Do you mean DC circuit earth fault in avr
caabinet,slipring.
AVR means automatic voltage regulation -i.e when generator
voltage is high or low ,it corrects the filed current and
correct the voltage.
Now if there is a rotor earth fault, the AVR maintains the
voltage but there is current leaking. rotor fault should be
conveys through the air gap or oil film to ground. It is
detected by by a separat rotor earth fault detector known
as singlerotor earth fault. This single rotor must become
double rotor earth fault .Then there is circulating current
flowing and completes grund circuit , till the double earth
fault relay annuciate and isolate the generator.

which oil used in transformer?

5 Answers  

---

How equivalent impedance is calculated in thevenin theorem?

1 Answers  

---

what is the differance between ac induction motor and ac synchronous motor?

5 Answers  

---

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

1 Answers   Bhel,

---

1.where in India the maximum transmission voltage is operated? 2.what the methods are used to cool down the transformer?give the specific ratings of the transformer & specific cooling process. 3.how zero & negative sequence reactances are formed in a rotating machine when fault occur in the system?

2 Answers   IES,

---

Explain cos(theta) and Sin(theta)

1 Answers  

---

we have one ups its neutral is not earthed.its one distribution MCB has a earth fault.but we can not put off any MCB.so how to find out that in which circuit is earthed without isolating the breaker.

3 Answers   CFCL,

---

what will happen if u run induction motor beyond its rated speed

13 Answers   Adani, BARC, Bescom,

---

what is rating providing of contactor,relay,fuse unit for motor output power

2 Answers  

---

what is the difference between inrush curent and jurk load.

2 Answers  

---

What is Instantaneous Earth fault relay,how will work

1 Answers  

---

i want to measure voltage difference between neutral and earth so i just simply use voltmeter. my question is that may i use this measure continuosly.or there are some electricity board restrication on that? or it creat some problem on my measuring device..?

2 Answers   NEEC,

---