Previous in Forum: 55 KW Siemens Motor Tripping   Next in Forum: Shared Gas/Hydro Trench (Non Utility)
Close

Comments Format:






Change Mode
Close

Subscribe to Discussion:

CR4 allows you to "subscribe" to a discussion
so that you can be notified of new comments to
the discussion via email.

Close

Rating Vote:







Add Vote
2 comments
Rate Comments: Nested
crpal
Member

Join Date: Jul 2011
Posts: 7

Transformer Neutral Grounding

07/13/2011 10:09 AM

Some power transformer neutral(Star) are earthed with Neutral Grounding Resistance(NGR) and others are directly grounded.What is the logic behind it and what should be the value of the NGR?
Register to Reply
Pathfinder Tags: transformer
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.
jack of all trades
Guru
New Zealand - Member - Kiwi Popular Science - Weaponology - New Member Engineering Fields - Power Engineering - New Member Engineering Fields - Electrical Engineering - New Member

Join Date: Sep 2006
Location: Auckland, New Zealand
Posts: 8777
Good Answers: 376
#1

Re: Transformer Neutral Grounding

07/13/2011 2:57 PM

See previous threads on CR4 regarding this commonly-asked subject. The search function is on the right hand side of the screen.

__________________
 jack of all trades
Register to Reply
electricalexpert65
Guru

Join Date: Oct 2009
Posts: 2061
Good Answers: 169
#2

Re: Transformer Neutral Grounding

07/27/2011 10:01 AM

Generally Low Volatge Winding Neutrals of Transformers are Solidly Earthed and Medium Voltage Winding Neutrals are earthed through an impedance. To understand the logic, please attend to our training programme on Earthing.

The value of NGR is: Phase Voltage of the system to be earthed / desired earth fault current.
Register to Reply
Register to Reply
Have a Different Question?
2 comments

Previous in Forum: 55 KW Siemens Motor Tripping   Next in Forum: Shared Gas/Hydro Trench (Non Utility)

Advertisement

Got Something to Say?
Ask a Question
Start a Discussion

Search this Forum
Electrical Engineering:
Go

CR4 Sections
Aerospace
BioMech & BioMed
Chemical & Material Science
Civil Engineering
Communications & Electronics
Education and Engineering Careers
Electrical Engineering
General Discussion
Instrumentation
Manufacturing
Mechanical Engineering
New Technologies & Research
Software & Programming
Sustainable Engineering
Transportation

Site Directories
Forum Directory
Blog Directory
User Group Directory
RSS Feeds

CR4 Rules of Conduct
CR4 FAQ
Site Glossary

Who's Online (74 right now)
Show Members
Advertisement