×
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

Motor protection cooling time constants?

Motor protection cooling time constants?

Motor protection cooling time constants?

(OP)
In GE Multilin motor protection relays is possible to set values for cooling time constants (running and stopped).
Anyone knows typical values for these constants for different HP motors?
It is clear that these values are affected if the motor haves external forced cooling (big motors).
I did search internet, but I didn't find any reference or recommendation.
Thanks in advance.

RE: Motor protection cooling time constants?

The time constant varies a lot. A "standard" value used is often 15 minutes. But there are large totally enclosed self-cooled motors that have time constants between 1 and 2 hours and there are motors with forced ventilation that have time constant down to a few minutes.

Most motor manufacturers have these data listed in their motor data sheets. Search Rockwell/AB, Siemens and ABB sites.

Gunnar Englund
www.gke.org

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