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ramanath.jsw
Participant

Join Date: Nov 2010
Posts: 1

NGT & NGR Application.

11/13/2010 1:42 AM

In our plant switch yard, we are having 220/33/33 kv (star/Delta) transformers.All delta windings having NGTs for protection and neutral point.Thees(Few) are havingg S.C current capacity of 7KA for 5sec.We have introduced NGRs in series with neutrl & earth link to avoid the Dip in system voltage during fault.I am not getting the exact calculation of that fault current and voltage dip.Please help me regarding this.

NGT/NET:Neutral Grounding Transformer

NGR:Neutral Grounding Resistor.
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electricalexpert65
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Join Date: Oct 2009
Posts: 2061
Good Answers: 169
#1

Re: NGT & NGR Application.

11/15/2010 9:15 AM

Try www.i-gard.com.
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