×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Difference between CT class 5L400 & C400

Difference between CT class 5L400 & C400

Difference between CT class 5L400 & C400

(OP)
Dear Members,

Please anybody tell me about the difference between the CT class 5L400 & C400

RE: Difference between CT class 5L400 & C400

http://www.gedigitalenergy.com/multilin/notes/arts...

See page 106 for ASA Accuracy Classifications

The letter L stands for low internal secondary impedance, which is a characteristic of bushing-type CTs having completely distributed secondary windings or of window type having two to four secondary coils with low secondary leakage reactance. The number before the letter is the maximum specified ratio error in percent (= 100IRCF Ð 1I), and the number after the letter is the maximum specified secondary
terminal voltage at which the specified ratio error may exist, for a secondary current of 20
times rated.

RE: Difference between CT class 5L400 & C400

Classification C or K covers current transformers in which the leakage flux in the core does not have an appreciable effect on the ratio or ratios within the limit of current and burden.
K classification shall have a knee-point voltage of at least 70 percent of the secondary terminal voltage rating see IEEE C57.15 for further info.

RE: Difference between CT class 5L400 & C400

5L400 (CSA) means 5% allowable error up to 20 times rated current into a 4 ohm burden.

C400 (IEEE) means 10% allowable error up to 20 times rated current into a 4 ohm burden.

20 x 5A x 4ohm = 400V

In practice, there is no appreciable performance difference.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources