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Anonymous Poster

NGR

08/15/2010 11:40 AM

How to calculate the rating of NGR resistance
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msamad
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Join Date: Feb 2009
Location: Houston, USA
Posts: 946
Good Answers: 244
#1

Re: NGR

08/15/2010 3:51 PM

See this thread: http://cr4.globalspec.com/thread/51653/Neutral-Ground-Resistor-NGR, especially the links in comment # 2.

- MS

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rasam.syamsudin
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Join Date: Dec 2009
Location: Jakarta 12130 Indonesia
Posts: 76
Good Answers: 1
#2

Re: NGR

08/15/2010 8:38 PM

Z = V/I

in which V is a phase voltage and I is a maximum predicted ground fault current, which is permitted to flow in the NGR for 10 seconds (most designer use this value).

Z = R + jX, in this case R>> jX, then jX is ommited.

So, Z = R.

It is one of some other methods.

If you want to read mre detail on this subject please read "Protective Relaying principle and Applications by J. Lewis Blackburn" or you can search in this forum for NGR topic".

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electricalexpert65
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Join Date: Oct 2009
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#3

Re: NGR

08/17/2010 11:15 AM

Please visit: "www.i-gard.com"
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