Previous in Forum: For 11kV Cable Sizing   Next in Forum: Circuits of AVR, For a Three Phase Generator
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
3 comments
Rate Comments: Nested
Spicar Kilapilo
Participant

Join Date: Oct 2011
Posts: 3

Neutral Disconnect Switch

10/28/2011 7:22 PM

Hi,

If a gen set is synchronized parallel with utility and its neutral switch fail to disconnect, what are the possible risk to the generator and the one who is operating it ?
Register to Reply
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.

Good Answers:

These comments received enough positive votes to make them "good answers".
mike k
Guru
Hobbies - DIY Welding - New Member

Join Date: Apr 2008
Location: Bristol, Tennessee
Posts: 1177
Good Answers: 58
#1

Re: NEUTRAL DISCONNECT SWITCH

10/28/2011 7:35 PM

I'll go out on a limb here and say no real risk to anything. Where the gen connects to the utility the neutral should be connected to ground, so I can't imagine any problem if a switch does not disconnect the gen from the utility.

__________________
 mike k
Register to Reply
leveles
Guru

Join Date: Jan 2008
Posts: 1753
Good Answers: 59
#2

Re: Neutral Disconnect Switch

10/30/2011 12:25 AM

I will go out on the limb, and say that it will blow up into your face.
Register to Reply
2
msamad
Guru

Join Date: Feb 2009
Location: Houston, USA
Posts: 946
Good Answers: 244
#3

Re: Neutral Disconnect Switch

10/30/2011 1:04 AM

It is suggested to disconnect the neutral with the line conductors. In LRG (Low Resistance Grounding) or HRG (High Resistance Grounding) system, the neutral is not at ground potential. In the case of solidly grounded system, the neutral is supposed to be at ground potential but if neutral is not properly grounded, there might be voltage in the neutral. In all cases, there is possibility of having voltage at neutral point. So, if the generator neutral is not disconnected from the utility system (the utility neutral is connected to the generator neutral point), there is a risk of the presence of voltage at generator neutral and hence a risk of hazards to the generator as well as the operating and the maintenance personnel.

These related links also may help:

http://www.kraftpower.com/pdfs/KPC_Info_05_switching_neutral.pdf

http://www.cumminspower.com/www/literature/technicalpapers/PT-6005-GroundingAC-1-en.pdf

http://www.cumminspower.com/www/literature/technicalpapers/PT-6006-GroundingAC-2-en.pdf

- MS

__________________
 "All my technical advices in this forum must be consulted with and approved by a local registered professional engineer before implementation" - Mohammed Samad (Linkedin Profile: http://www.linkedin.com/in/msamad)
Register to Reply Good Answer (Score 2)
No more Good Answers.
Register to Reply
Have a Different Question?
3 comments

Good Answers:

These comments received enough positive votes to make them "good answers".
Copy to Clipboard

Users who posted comments:

leveles (1); mike k (1); msamad (1)

Previous in Forum: For 11kV Cable Sizing   Next in Forum: Circuits of AVR, For a Three Phase Generator

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 (66 right now)
Show Members
Advertisement