×
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

Trafo REF protection setting calculation - Formula

Trafo REF protection setting calculation - Formula

Trafo REF protection setting calculation - Formula

(OP)
AREVA make MiCOM P120 relay can be used for REF protection of transformer windings. I have come across recently a calculation for Stability voltage, which shows the formula as:
Vs = 40 + 0.05xRst + 0.04x(If/N)x(Rct+2Rl)
This seems very different from the formula we normally use, Vs = (If/N)x(Rct+2Rl)
Any experience/explanation!
Thanks in anticipation.
 

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