Previous in Forum: Effect of Temperature Stability on Induction Motor   Next in Forum: EKM Metering, What is Happening?
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
Mahendra Singh
Participant

Join Date: Apr 2012
Posts: 2

Restricted Earth Fault & Standby Earth Fault Relay

04/03/2012 6:20 AM

My 3MVA transformer is sensing out side of zone fault but REF relay tripping others not.

Kindly suggest me why this is happening?
Register to Reply
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.
PWSlack
Guru
United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

Join Date: Jan 2007
Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on.
Posts: 32175
Good Answers: 839
#1

Re: Restricted Earth Fault & Standby earth fault relay

04/03/2012 6:30 AM

One explanation is that there is an earth fault greater than the trip setting of the restricted earth fault relay. Nothing else can be seen from here.

__________________
 "Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
Register to Reply
electricalexpert65
Guru

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

Re: Restricted Earth Fault & Standby Earth Fault Relay

04/03/2012 11:17 AM

Are CTs matched perfectly? Is there a stabilising resistor? Has it been properly set?
Register to Reply
Mahendra Singh
Participant

Join Date: Apr 2012
Posts: 2
#3
In reply to #2

Re: Restricted Earth Fault & Standby Earth Fault Relay

04/03/2012 11:44 PM

All CTs are matched.

Stabilising resistor is set as per recommended setting.
Register to Reply
Register to Reply
Have a Different Question?
3 comments
Copy to Clipboard

Users who posted comments:

electricalexpert65 (1); Mahendra Singh (1); PWSlack (1)

Previous in Forum: Effect of Temperature Stability on Induction Motor   Next in Forum: EKM Metering, What is Happening?

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 (79 right now)
Show Members
Advertisement