Answer / afrooz

NGR means neutral grounding resistor.It is used to limit
the earth fault current.

Answer / vijay kumar

NGR(Neutral Ground Resistor) which is connected at the star
point of an alternator or a tranformer..
There two consideration to Select NGR
1) Plant capacity
2) Current carrieng capacity
If any unbalance current occures in any of the phases
that surplus current will alowed to flow through the NGR,
where in Neutral current will suuprssed so that alternator
winding will be in safe,

Answer / mahesh sali

NGR is neutral grounding resistor , The function of NGR is
to protect the equipments against the earth fault , help to
limit the fault current to earth.Its also give the
additional purpose to maintain the balance current in all
three phases with w.r.t neutral .

generally the NGR earthing used upto the 11kv , Ac sply.

Answer / subhakant / bhajahari

NGR MEANS NEUTRAL GROUNDING WITH RESISTANCE. THE PURPOSE OF
USING NGR FOR NEUTRAL GROUNDING IS TO LIMIT THE FAULT
CURRENT WITHIN THE OPERATING RANGE OF PROTECTING EQUIPMENTS
AND ALSO TO SENSE THE SYSTEM UNBALANCE CURRENT

Answer / sandeep pareek

N.G.R. USE TO ALTERNATOR WINDING PROTECTON WHEN ANY FAUL
OCCURE IN ALTERNATOR N.G.R PROTECT TO ALTERNATOR
WE ARE USE C.T. IN N.G.R. PANEL .. ALTERNATO OUTPUT PHASE
CONNECTION IN STAR THEN FAULT CONDITION EXTRA CURRENT
GROUND AND OUR ALTERNATOR ALSO SAFE

Answer / dibyaranjan pati

NGRs are employed in AC Distribution Networks.It limits the
Restricted Earth Current to a safe value which flows from
the Transformer or Generator star point when an earth fault
occurs in the system without exceeding specified temperature
limits.
Theses are connected between the neutral point of
transformer or generator & the earth.

Answer / abhishek anshu

Main purpose of NGR is :

1. To protect equipment from earth fault.

2. To ground excessive leakage current.

Answer / pps

NGR means neutral ground reactor. Normally it is used in
Generation stations and long line shunt reactors. Main
purpose is to limit fault current when earth faults. and
also it acts as a phase winding when one of the reactor
winding or generetor winding or phese in lines open or
grounded.

Answer / soumen

NGR (Neutral Grounding Resistors )is employed in AC
distribution networks to limit the fault current which
would flow from the transformer or generator neutral star
point in the event of an earth fault in the systems. It is
used when the neutral of supply transformer is accessible
and its own impedance is not enough to limit fault current.
The rating of the protection relays within the required
time.
For Grounding Neutral of Transformer or Generator,
Resistors upto 33 KV are offered for fault of short
duration like 10 sec., 30 sec., 60 sec., continuous etc.

Answer / pramod verma

NGR means nutral ground gearthing. the maine purpose of
this equipment is that when ever fault occur in the
generator or transformer then it limt the fault current for
prevention from any major accident or flow any inbalance
current in normal condition. It always connect with star
point of generator or transformer.

What is harmonics. How does it get generated and means to arrest harmonics

8 Answers   Airtel,

What will happened. if we feed 3phase supplay to the stater with out insert the rotor. How much current will flow through the stater winnding?

2 Answers  

what is the function of a circuit breaker ?how does the circuit breaker function during normal operation of an electrical system

2 Answers  

An ISP is granted a block of addresses starting with 150.80.0.0/16. The ISP wants to distribute these blocks to 2600 customers as follows. a) 200 medium size businesses; each needs 16 addresses b) 400 small businesses; each needs 8 addresses c) 2000 households; each needs 4 addresses Design the subblocks and give the slash notation for each subblock. Find out how many addresses are still available after these allocations.

0 Answers   UOG,

what is a relay?

31 Answers  

Is there any Institution (Not AMIE)for giving B-Tech/M-tech in Electrical engineering for those who r in service? Give the details please.

2 Answers  

when we increased the current what do ?

0 Answers  

Why transformer making sound during operations?

2 Answers  

advantage,disadvantage,aplication of sensorless direct torque control of induction motor

0 Answers  

explain safety measures in alternator?

0 Answers  

operation principle of a generator? Gss, Diesel and HFO which is better and why?

1 Answers  

What is the output of below program? #include <stdio.h> int main() { int p,q; for(p=1,q=1;p<7;p++) { printf("%d%d__",p,q); } return 0; } Answers- 1. 17__27__37__47__57__67__ 2. 11__21__31__41__51__61__ 3. __11__21__31__41__51__61__ 4. Compilation error

1 Answers