Interested to Buy Any Domain ? << Click Here >> for more details...
only some transformers and some generator requires NGR why?
- 1 Answers
- 5008 Views
- I also Faced
- E-Mail Answers
Answer Posted / pavan
NGR - Neutral Grounding Resistor is used to limit the fault
current of a sytem.
So generally a system with high line voltage of 3.3KV and
above normally comprises of high load equipment which
results in very high fault currents due to a Short-circuit
fault. Normally during a Earth fault the fault current
flowing through the earthed phase is to be carried by the
remaining phases which may be very much more than the
rating of the conductors. So we follow the Neutral
Grounding practice so that the fault current is carried by
the nuetral.
Now this current carried by the nuetral is to be limited
such that this high fault current does not damage the
grounded equipment so in the neutral we insert a resistance
which is the NGR.
So for any high voltage system to limit the fault current
NGRs are used. for the equipment working at lesser voltage
normally can withstand the short circuit currents for short
time.
| Is This Answer Correct ? | 10 Yes | 0 No |
Post New Answer View All Answers
sir please tel me how calucalte kwh if home taken load 30ams how maney kwh taken per day.and 3phase motor 5hp per hars how maney load teken and how mach kwh and forward me to electrical table for calicalte kwh and kvr and kvah
explain the what is a drive ? 0 4 which type motor r use in the celling fan..... PCB plannet 2 13 If stator & rotor of a 3-phase induction motor have different no. of poles, will the motor run or not?? types of drives Why dc supply is used for closing and tripping coil of ht breakers. What happen if we use only ups ac supply only. ACC 1 41 how the 3phase induction motor is running in 2phase supply with help of capacitor? 1 33 what is the actual difference betwen constructional details and constructional features? 1 20 how does commutator convert a.c to d.c?
What is the emf equation of a transformer?
Transmission through a short line depends on
The advantages of Magnetic flux leakage technique over Ultrasonic technique for non distructive testing of material.
What is a dc motor?
what is the diff. between x'mer , isolation x'mer & ultra-isolation x'mer ?????????????
how did the testing of protection relays done through current injection
When and where resistance earthing is used ? How to calculate the time constant for earth fault
where lt & ht capacitor used
WHY IL=IPH IN STAR AND WHY IPH=IL/1.732 IN DELTA? WHAT IS REASON BEHIND IT?
What should be current in the Primary and secondary side of 1000KVA (11KV Supply)Transformer.?
any body,pls tell me how to done relay coordination ? how to coordinate by TCC curve?how to read the tcc curve?
lenz law application and define
1.why are not using acb 33kv ht side? is there any problem 2.what is difference between acb,vcb,sf6 breackers? 3.what is the function of invertor and convertor in ups?
