×
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

WTI Trip setting for power transformers

WTI Trip setting for power transformers

WTI Trip setting for power transformers

(OP)
Transformer life is determined by the condition of the solid insulation (the paper). Normal Kraft paper will begin to accelerate thermal ageing at 95 degrees Celsius and thermally upgraded paper will begin accelerated ageing at 110 degrees Celsius. The IEC 76-2 standard commonly accepts WTI relay tripping set point to be set at 140 degrees for a medium type power transformers.  

What is the general view of the group members as to setting the WTI at 140 degree set point for a new transformer?
 

RE: WTI Trip setting for power transformers

Normally WTI is programmed for indicating the hot spot temperature in the winding.

Trip setting of the WTI can be a maximum of 120C ( maximum permissible hot spot winding temperature during normal cyclic loading as per IEC 60076-7 Loading Guide for Power Transformers)Alarm setting will be 10-15 C lower than trip setting.

But utilities usually set the trip contacts lower than  120C.

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