Interested to Buy Any Domain ? << Click Here >> for more details...
How can we calculate ngr resistance for a generator and
Transformer ?
What type of transformer requires ngr ?
- 5 Answers
- 43770 Views
- Welspun, I also Faced
- E-Mail Answers
Answer Posted / pavan
The value of the NGR to be inserted in the cicuit can be
calculated by the simple formula
R = V / (√3 * I)
Where V is the System Line voltage in Volts
I is the value of the fault current to be limited
In general practice the fault current is limited to the
full load rating of the largest equipment available in the
system.
| Is This Answer Correct ? | 6 Yes | 5 No |
Post New Answer View All Answers
what is the difference between directional & non directional earth fault with example please explain.
how to select the automotive wire size by mathematical calculation. for xenon headlamp with ballast. the ballast given data voltage 10-17v,current permenant 6amp, run up phase is 15amp, peak at swicth on max 400micro sec is 40amp.the sum of cable resistance is 150mohm.please provide referenc document if any for relating the peak at switch on current,time & wire wire size
why the difference arise between HT reading & LT reading (submeters fixed in complexes, apartments etc)if the power factos exceed from 0.9 to 1 can the ht meter reads fast?
What is Plank's Law?
What is the current carrying capacity of 0SWG,3SWG,10 & 12 SWG solid bare overhead copper conductors?
what is the difference between ac motor and dc generator
working principle of AC Servo Motor with its construction
How to find out damper winding failure for synchronous machine?
what is meant by star/delta voltages as 440/220 in a 3 phase induction motor, and why it should be connected on STAR IN 3 PHASE SUPPLY
how to select energy meter? have any calculation?
difference between ac series and parallel circuit
What is resolver and glass scale in CNC how they work?
What is the difference between electronic regulator and ordinary electrical rheostat regulator for fans?
Describe the colour rendering properties of i) tungsten filament lamps ii) tubular fluorescent lamp
If i have two 3000 kW motors and the whole facility requires a 10 MVA transformer. What would be better installing two 5 MVA transformers(one for 1 motor ) or just a single 10 MVA transformer for both of them. Give reasons for your answer.
