Neutral Monitoring Relay for NGR

In one of my projects we were feeding the entire plant by means of 3MVA, 6.6kV,Dyn11 Transformer. This Transformer is Resistor Grounded ie., Neutral Grounding Resistor (NGR)for which a we have provided Netural Monitoring Relay (NMR). Inside the NMR there is a sensing Resistor which is of rating 5kV, if we change the rating of sensing resistor to 15kV is there any problem w.r.t operation of the NMR. Please guide me in this regards.
Neutral Earthing

asked 12/12/2011
Keshavanarayana.G3
Keshavanarayana.G

2 Answers

Thank you Sir.
answered 12/16/2011 Keshavanarayana.G 3
Keshavanarayana.G
I don’t believe there would be an issue with the voltage. The resistance needs to be the same as the NMR will be measuring the circuit through the sensing resistor and NGR. Given the voltage level, I would also confirm this with the NMR manufacturer just to be on the safe side.
answered 12/15/2011 Steven McFadyen 246
Steven McFadyen

Your Answer

In order to provide an answer to this question, you must Login

I am flagging this question because...




10 inform moderator flags remaining

I am deleting this question because...




I am flagging this answer because...




10 inform moderator flags remaining

Flagging a Post

You have already flagged this post. Clicking "Remove Flag" below will remove your flag, thus reducing the count by one as well.

I am deleting this answer because...





What happened to the cable notes?

If you are wondering what happened to our cable notes, the short answer is that we have moved them to myCableEngineering.com.  The "Knowledge Base" at...

Low Voltage Fault Tables

The following tables provide quick order of magnitude fault levels for a a range of typical low voltage situations.

Harmonised Cable Codes and Colours

Within Europe the European Committee for Electrotechnical Standardization (CENELEC) has standardised the both the designation and colour of cables.   ...

Cost Performance and Time

Often us engineers get so bogged down in equations, using software, producing drawings and writing specifications that this becomes the sole focus.   ...

What is an Open Delta Transformer

In three phase systems, the use of transformers with three windings (or legs) per side is common.  These three windings are often connected in delta or...

Cable Insulation Properties

Cable insulation is used to provide electrical separation between conductors of  a cable.  During the historical development of cables, numerous types...

Understanding electric motor insulation & temperature

Anyone specifying or using electric motors should have a basic understanding how the insulation is related to temperature. Three classes of insulation...

Motor Starting - Introduction

Motor starting and its associated problems are well-known to many people who have worked on large industrial processes. However, these things are, of course...

Introduction to Cathodic Protection

If two dissimilar metals are touching and an external conducting path exists, corrosion of one the metals can take place.  Moisture or other materials...

IEC 60287 Current Capacity of Cables - Rated Current

In the previous note we looked at the approach taken by the standard to the sizing of cables and illustrated this with an example.  We then looked at one...

Our website uses cookies so that we can provide a better experience.
To learn more about what cookies are and how to manage them visit AboutCookies.org