What is basic fundamental for choosing NGR or NGT for any
generator neutral grounding
Answer Posted / vishal i vadodaria
As we know that in Y connection there are 3 phases [R,Y&B] & a neutral.
In neutral we provide a resistance & than we used to ground it.Such system called neutral ground resistance [NGR].
Why we use NGR?
AS we know ideally the sum of current Ir+Iy+Ib is zero. So in normal condition the current which flow through neutral of Y winding is very low.
In case of occurrence of phase to phase or phase to ground fault heavy unbalance current will be generated & that will flow through neutral. To restrict this current we provide a resistance in neutral.
If we do not provide resistance in neutral & fault occurs at that time a heavy current will flow & it cause excessive heating in stator winding & it may damage the winding. to prevent this we provided a resistance in neutral.
Is This Answer Correct ? | 60 Yes | 9 No |
Post New Answer View All Answers
How generating electric power export to grid from the generating station ?
hello friend i wish to study a course related to the electrical construction, controlling and monitoring , which course i want to study? pls give me the name of institute?
In between UPS out going changer over switch and ups raising main input, both side cable gland producing heat but the cable doesn't get heat,Why?
if the load is 80 amp for main fuse and 100 amp for breaker so how can we calculate the cable size (cooper ) .
what is the mechanism of operation of brushless dc motor why is it more wexpensive then ordinary permanent magnet motors
Explain the fundamental difference between emf (electro motive force) and pd (potential difference) ?
How REF protects transformer alone? explain with diagram.
upto how many load can v connect to stabilizer which is used for tv
A TRANSFORMER 440/400V,DELTA/STAR CONNECTED.THE NEUTRAL CONNECTED WITH GROUND CABLE THAT IS DIRECTLY CONNECTED TO THE PANEL,FROM PANEL IT IS CONNECTED EARTH PIT.IS IT RIGHT? IF IT IS RIGHT LEAKAGE CURRENT AFFECTED.SECONDATY IS PROTECTED WITH EARTH LEAKAGE RELAY.
What is mean by spike arrester(Voltage Operated)
if a.c supply is given to the motor,, what happen?
Ceiling Fan and Storage type water heater. Discuss
what is the write prosidure of stringing of 8meter pcc pole.
Is there any standard guidelines/Criteria to design NGR/NGT.?
I have a CT meter with ratio 60/5. The meter reading of previous month was 3290.49 and that of current month was 3797.26. How many chargeable units as per normal meter should be my reading.