Answer / shyamkr

actually i don't understand what you actually want to ask in
this question...
there are any reasons because of which the excotor coil
fails in alternator
i)due to earth fault in excitor winding.
ii)due to short circuit of two or more turns.
iii)due to insufficient exciting current.
and some more...
i don't know whether i have given the thing you want in
this question or not........

Answer / satya prakash devagupthapu

the exciter coil of alternators fails due to
1)when the diode plate not properly work at the back of alternator which is connected to compound wound generator rotor.(the exciter field coil connections of alternator are connected to compound wound generator rotor).
2)and major reason is AVR failures also.

To avoid these failures of components maintain equal and correct load on each phase of the generator.
and avoid loose connections at the diode plate terminals.

Answer / pillay

thanks & sorry Shyamkr.It is suppose to be what are the
reasons 1} WHY the excitor coil of a alternator can fail.
2} How to prevent reoccurance.

how to measure dc earth leakage current?

1 Answers  

---

resistance of transformer oil=?

1 Answers   HCL,

---

why we not connect the 12 V batteries in parallel to get the more backup supply for an UPS ? wheter off line or on line UPS ?

2 Answers  

---

how much test voltage should applied for tan delta test.

2 Answers   Electrical, TATA,

---

what is the rating of boiler?

4 Answers  

---

75 kw motor take 45 amp in no load delta in star 10 amp but in load it will take 160 amp but IR velue of winding above 500 at 1kw ph to earth and ph to ph. what problem it should be?

1 Answers  

---

I have a 25 KVar capacitor bank at my facility.How to check the capacitor bank ??

2 Answers  

---

On what basis no of earth pits are to be decided either for transformers or for equipment?

8 Answers   BEL, Reliance,

---

what is the difference between core & shell type transformer ?& where we use those transformers ?

10 Answers   BNCET,

---

why are the transmission lines operated at 220 kv nly... nt les dan dat...

3 Answers  

---

plz send me the procedure and syllabus for mseb exam

1 Answers  

---

What are the uses of MCB & ELCB ?

2 Answers  

---