GeekInterview.com
Series: Subject:
Question: 431 of 453

What is the purpose of calculating knee point voltage for Current transformers?

Asked by: rohitasruti | Member Since Dec-2006 | Asked on: Dec 31st, 2006

View all questions by rohitasruti   View all answers by rohitasruti

Showing Answers 1 - 5 of 5 Answers
s kumar

Answered On : Mar 31st, 2007

The main purpose of calculating the knee point voltage is to identify the core saturation characteristics .This is mainly done on protection CT's

  
Login to rate this answer.
cvk

Answered On : Oct 5th, 2007

After knee point, saturation of the CT occurs. Hence the CT has to work below the knee point. By selecting a CT suitably for operating point below the knee point, proper operation of the protection (like differential, REF where protection class CTs are used) can be ensured.

Yes  2 Users have rated as useful.
  
Login to rate this answer.
cvk

Answered On : Oct 5th, 2007

The purpose of calculating knee point is to select CT with operating point below knee point as above knee point CT tends to saturate and cause mal operation of protection relay. Knee point calculation is done for CTs usedfor differential protection and REF.

Yes  2 Users have rated as useful.
  
Login to rate this answer.
GeeK_Percy

Answered On : Oct 3rd, 2009

View all answers by GeeK_Percy

Purpose of collecting Knee voltage is to use the circuit as an operating or as an metering circuit.

Operating circuit works far below knee voltage.

Metering circuit works at the verge of saturation.

Yes  2 Users have rated as useful.
  
Login to rate this answer.

To know Whether the CT is saturated or not.

  
Login to rate this answer.

Give your answer:

If you think the above answer is not correct, Please select a reason and add your answer below.

Related Open Questions

Ads

Connect

twitter fb Linkedin GPlus RSS

Ads

Interview Question

 Ask Interview Question?

 

Latest Questions

Interview & Career Tips

Get invaluable Interview and Career Tips delivered directly to your inbox. Get your news alert set up today, Once you confirm your Email subscription, you will be able to download Job Inteview Questions Ebook . Please contact me if you there is any issue with the download.