Answer / nishad

for the protection of generator we useing
1, under voltage/ overvoltage Relay
2Under/over frequency,
3, Reverse power relay,
4, Earth fault Relay
5, Differential Protection relay
6, over load protection
8, resticted earth fault relay ***(optional)
9,RTD's for bearing & winding >> protect from over heat
10,if it contain in clossed container provide differential
pressure relay,
These are the normal protection from Electrical side.

Answer / hitesh g. dobariya

The following are the main protection schemes adopted for
our generator.
1. Generator Differential Protection
2. Generator & Transformer Differential Protection
3. Loss of Field or Loss of Excitation Protection
4. Negative Sequence or Current Unbalance Protection
5. Over Fluxing or Over Excitation Protection
6. Over Current Protection
7. Stator Earth Fault Protection
8. Rotor Earth Fault Protection (64R)
9. Restricted Earth Fault Protection
10. Backup Impedance Protection
11. Low Forward Power Protection
12. Reverse Power Protection
13. Pole Slip Protection
14. Pole Discrepancy Protection
15. Local Breaker Back Protection
16. Bus Bar Protection
17. Over Frequency Protection
18. Under Frequency Protection
19. Over Voltage Protection

Answer / renjith v.r

The following are to be used
1.Voltage restraint O/C relay
2. E/F relay
3. stand by E/F relay using CT in neutral earthing conductor
4. Under voltage ,over voltage relay
5. Differential potential relay
6.negative sequence relay
7.Vector surge relay
8.Reverse power and Reverse reactive power relay
9.rotor E/F relay
9.High vibration, oil temperature, Overspeeed and under speed alarm trip

Answer / vedprakash uppadhaya

reactors, thyristor contoroled rectifier

Answer / venkat

brushes

Is any generator is developed which is operated with out diesal or other expensive source?

0 Answers  

---

Sir We have a REF relay connected to 10MVA(Y-Y) Transformer.on External earth fault REF relay trips along with earth fault relay.The REF relay has no complant as we tested relay.Why is it happening?

3 Answers   KSEB,

---

the inertia constants of two machines are respectively 30and 42 MJ per MVA.when the change in frequency due to change in load in first machine is 12 Hz,the change in second machine frequency will be?

1 Answers  

---

why two windings are using in single phase AC motor

3 Answers  

---

Dear sir, we are getting voltage fluctuations suddenly for 2 or 3 minutes again it becomes normal. we checked each and every connection some times we are getting 110 volts like that from earth to neutral again it is reducing we are getting supply from 45 kva DG set give earthing properly.

3 Answers   Triveni,

---

---

why we have to do tan delta test of the transformer oil???

5 Answers  

---

oil cooled transformer

0 Answers   Jindal,

---

what is diffrence b/w -48vdc and +48vdc ?

1 Answers  

---

Where earth point should provided in Ships or Submirines.

2 Answers   SSC,

---

Name the test signals used in control system

0 Answers  

---

What must the distance between two MV cables be when they are laid on tray?

0 Answers  

---

Why use in ht motore

0 Answers   ACB Group,

---