Answer / 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.

What is Harmonics how it is produced and what is the method to control the same

0 Answers   Siemens,

---

condition Autotrip facia come on control panel of electrical transmission line?

0 Answers   Getco,

---

In Plug used in house,Why Earth of the plug more thicker & deeper?

8 Answers   L&T,

---

Why we are testing cables with dc?

1 Answers  

---

why we step down voltage level from 33kv to 11kv and 11kv to 415v.Instead we can step down voltage from 33kv to 415v directly using single transformer.

12 Answers   ABB, Adani, Central Electricals, Electrical, HCL,

---

---

differentiate between one way two gang switch & two way one gang switch, used in designing the loads of building.

1 Answers  

---

why we testing the core balance of the transformer before comissioning?

0 Answers  

---

What is error of a measurement?

0 Answers  

---

why two windings are using in single phase AC motor

3 Answers  

---

transformer phasor diagram under load explain it?

0 Answers  

---

what is the difference between unarmoured & Flexible cable? How to identified?

0 Answers   Priyanka Electricals,

---

what parameters are should nessary for control technic dc drive(in rolling mills)?

0 Answers   TATA,

---