Previous in Forum: Instrument Transformer (CT/PT)   Next in Forum: Corona Discharge
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
10 comments
Rating: Comments: Nested
Anonymous Poster #1

Difference Between Knee Point and Saturation Point of CT

10/27/2013 1:14 PM

Dear Friends,

When i test knee point of CT, I get the Knee point is 10% increase in applied secondary voltage which results in 50% increase in excitation current. I know this but in magnetisation curve of CT, Knee Point is the Saturation Point of CT, then why the CT doesn't go for saturation after test the knee point voltage test. what is the difference between knee point and Saturation Point? when test for knee point voltage, if there is any possibility for CT saturation?
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!
wareagle
Guru
United States - Member - New Member

Join Date: Jun 2008
Location: Alabama
Posts: 1604
Good Answers: 63
#1

Re: Difference between Knee Point and Saturation Point of CT

10/27/2013 2:15 PM

https://www.google.com/search?sourceid=navclient&aq=hts&oq=&ie=UTF-8&rlz=1T4GGLR_enUS559US559&q=Difference+between+Knee+Point+and+Saturation+Point+of+CT
Reply
TonyS
Guru
United Kingdom - Member - New Member

Join Date: Aug 2010
Location: Resting under the Major Oak
Posts: 4347
Good Answers: 181
#2

Re: Difference between Knee Point and Saturation Point of CT

10/27/2013 2:43 PM

Knee point tends to bring tears to the eyes.

Saturation point is when I fall over at the bar.

Ask a reasonable question you may get something in the way of a reply.

__________________
 The reports of my death are greatly exaggerated.
Reply
peugeot man
Associate

Join Date: Jan 2010
Location: Adelaide South Australia
Posts: 40
#3

Re: Difference Between Knee Point and Saturation Point of CT

10/27/2013 10:32 PM

What the hell is all that about it just don't make sense

Peugeot man

__________________
 " For also knowledge itself is power." -- Francis Bacon
Reply
Anonymous Poster #2
#4
In reply to #3

Re: Difference Between Knee Point and Saturation Point of CT

10/28/2013 3:17 AM

Then ask them what the elbow point is....
Reply
TonyS
Guru
United Kingdom - Member - New Member

Join Date: Aug 2010
Location: Resting under the Major Oak
Posts: 4347
Good Answers: 181
#6
In reply to #4

Re: Difference Between Knee Point and Saturation Point of CT

10/28/2013 10:22 AM

Elbow point is when I'm still still leaning on the bar.

__________________
 The reports of my death are greatly exaggerated.
Reply Score 1 for Off Topic
IQ
Guru

Join Date: Feb 2013
Posts: 2004
Good Answers: 31
#5

Re: Difference Between Knee Point and Saturation Point of CT

10/28/2013 3:50 AM

Re-read Wikipedia and read it more carefully this time. It will help you with your homework. It clearly explains Saturation and Knee point, where you got the info from previously.
Reply Score 1 for Good Answer
No more "Almost" Good Answers.
electricalexpert65
Guru

Join Date: Oct 2009
Posts: 2061
Good Answers: 169
#7

Re: Difference Between Knee Point and Saturation Point of CT

10/30/2013 12:20 PM

Alternately, I will put another question to you. When a CT is in service, definitely, it must repeatedly see fault currents much beyond its accuracy limit primary current or even saturation current. Have you ever wondered why then the CT is not driven to saturation.

Think & if you get an answer to this question, you will get answer to your question.
Reply
PeterKnauf
Participant

Join Date: Oct 2013
Location: Santa Ana, CA
Posts: 3
#8

Re: Difference Between Knee Point and Saturation Point of CT

10/31/2013 5:44 AM

This is the knee point??

And this is the saturation point.

__________________
 www.circuitbreakercity.com
Reply
electricalexpert65
Guru

Join Date: Oct 2009
Posts: 2061
Good Answers: 169
#9
In reply to #8

Re: Difference Between Knee Point and Saturation Point of CT

10/31/2013 8:15 PM

Ha! Ha! Ha!
Reply
avra.setcl
Active Contributor

Join Date: Nov 2012
Posts: 21
#10

Re: Difference Between Knee Point and Saturation Point of CT

12/05/2013 3:24 AM

it is not parmanent saturation. saturation means winding cannot oppose current flow linearly beyond saturation. while the ct put into power ckt then for high pri current secondary of ct can not produce necessary flux or voltage to drive current in metering or protection ckt.
Reply
Reply to Forum Thread
Have a Different Question?
10 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); avra.setcl (1); electricalexpert65 (2); IQ (1); PeterKnauf (1); peugeot man (1); TonyS (2); wareagle (1)

Previous in Forum: Instrument Transformer (CT/PT)   Next in Forum: Corona Discharge

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 (46 right now)
Show Members
Advertisement