Previous in Forum: Bi-Metallic Strip   Next in Forum: Break Down Voltage of Transformer Oil
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
Anonymous Poster

Embedded Generator Earth Fault Protection

02/03/2011 2:18 AM

Hello,

In my opinion in three phase-three wire radial network system, during phase to ground fault voltage of faulty phase drops zero and phase to ground fault of healthy phase increases.

But if we want to prevent embedded generator operating in island mode because of an earth fault of anywhere in network we must provide selective current protection.

We can't provide this protection with overvoltage or undervoltage protection?

What is your opinion and suggest?

Best Regards,

Musa UÇAN
Reply
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.

"Almost" Good Answers:

Check out these comments that don't yet have enough votes to be "official" good answers and, if you agree with them, vote them!
electricalexpert65
Guru

Join Date: Oct 2009
Posts: 2061
Good Answers: 169
#1

Re: Embedded generator earth faulth protection

02/03/2011 5:25 AM

But, there could be over voltage or undervoltage in the system even when there is no earth fault. If you use a voltage relay for earth fault, how will you deduce the cause of the tripping?
Reply Score 1 for Good Answer
No more "Almost" Good Answers.
mountk2
Power-User

Join Date: Jun 2010
Posts: 348
Good Answers: 10
#2

Re: Embedded Generator Earth Fault Protection

02/03/2011 11:06 PM

For earth faults you have to select graded earth fault protection relays 50G / 51G, who told you to use "selective current protection".

__________________
 Knowledge sharing is a WIN-WIN situation
Reply
Anonymous Poster
#3

Re: Embedded Generator Earth Fault Protection

02/04/2011 1:50 AM

Dear Mountk2,

In radial network earth fault may occur on anywhere....

Our aim to prevent operating generator in island mode.

If earth network occurs in fider which feed unearthed transformer ( DD ) about load side ( not source side ).

So earth fault current will flow on faulty conductor and return to the source from healthy conductor. Because there is no earth conductor...

Best Regards,

Musa UÇAN
Reply Off Topic (Score 5)
Reply to Forum Thread
Have a Different Question?
3 comments

"Almost" Good Answers:

Check out these comments that don't yet have enough votes to be "official" good answers and, if you agree with them, vote them!
Copy to Clipboard

Users who posted comments:

Anonymous Poster (1); electricalexpert65 (1); mountk2 (1)

Previous in Forum: Bi-Metallic Strip   Next in Forum: Break Down Voltage of Transformer Oil

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 (57 right now)
Show Members
Advertisement