Answer / naveen gladson

GNR stands for Ground Nuetral Resistor.Design suitable for
safe and reliable operation at site and rated to withstand
the specified short circuit current.

Answer / shyamkr

gnr stands for ground neutral resistance.
it has a zero ideal value.

Answer / hardip dodiya

The Value of NGR is depend upon the System Fault level
Calculation as per given by Designer:


Purpose : To limit the Earth fault current and Minimize the
value of fault current.

To Protect Transformer Neutral: Due to Earth fault
Heavy current flow in Earth mate where Transformer Neutral
also solid illy Earth. There are chances of current Flow
into Neutral of Transformer at that time Resistance Value
of NGR is to prevent that current into Neutral Path. and
avoiding Triping of Trafo. That the Reason Resistance Value
to NGR is depends on MAX FAULT CURRENT of ANY SYSTEM DESIGN.


Please anyone have objection For my these answer.

Please Provide your view with Reason.

Answer / rajesh

NGR stands for neutral
grounding resistor.it
depends on line voltage.if
line voltage is 11kv the
correspoding resistance
value is 63.5ohms.it's comes
from 11000/1.732

Answer / shaan from madurai

ground neutral earth resistance should be below one ohm.this
used for balance the voltage

Answer / avdhesh

It is neutral grounding resister.
Purpose : To limit fault current during eatrh fault.
Advantage : Earth Fault current will be less hence less
damages at fault location. Example - core damage in the
motors.
Value of NGR : It will depend how much earth fault current
you want to limit. Secondly on the earth fault relay
sensetivity. Generaly 8-9 Ohm resistace is used in HT
system where HT motors are used.

Answer / ekanadam naik

gnr stads ground neutral resistance value is 3 3-5 ohms

Answer / patlavath ekanadam rathod

GNR IS THE GROUNDTO NEUTRAL RESISTANCE, VALVE IS THE LESS
THAN 0.5 OHMS THIS IS THE BETTER VALUE,IN IDLE CASE WE WILL
CONDSIDER AS ZERO.

Answer / brijesh

Avdhesh is right.
The value of NGR is calculated as V/I Where V=system
voltage and I=Value of fault current

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