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

what is the application of dynamic Breaking resistor in inverter ? & How it works ?

2 Answers  

Can anybody tell me the Electrical IS rules website?

1 Answers  

how to determine capacitor bank capacity of one plant..

2 Answers   Dalkia, SPDC,

What will be the impact on motor performance if a LT motor is rewound with changed motor winding data as given below:- Original winding data: total 04 wires = 02 wires of 17 SWG + 02 wires of 16.5 SWG. Changed Winding data: total 03 wires of 15.5 SWG wire size Motor rating: 160KW, 740RPM, 415V, ID FAN application. Normal Running Current = 95% of FL Current.

0 Answers   NFL,

how mass curve differs from hydrograph.

0 Answers  

Hello Can I use step up HV transformer 440/4160V as a step down? Thanks Evgeny

5 Answers  

1)how many types of earth? 2)how many types of megger and how to select that range? how much time taken for megger calibration( we r using megger)

1 Answers  

why spark is produced in mosquito bat?and what are the ways to reduce it?

2 Answers   Godrej,

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

0 Answers  

i had aplied Hindustan Petroleum corporation limited for the post of maintenance technician -Electrical,i want model questions,if anybody have please send it or please advice?

0 Answers  

why the auxilary(starting)winding is provided in single phase inductoin motor?

5 Answers  

DIFFERENCE BETWEEN POWER AND CONTROL CABLES

9 Answers   NCC,