×
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

Back Enegize of Transformer

Back Enegize of Transformer

Back Enegize of Transformer

(OP)
Can we enegize a 240MVA 275/132kV step up transformer under no load condition by using the 132kV source due to 275kV incoming line is not ready.

The 240MVA transformer will put under "soak" condition.

BTW, can we use a step up transformer as a step down transformer?

Thanks.

RE: Back Enegize of Transformer

It is possible to energize the transformer from the low side. Make sure your protection system support that and may be a good idea checking with the manufacturer for advise and guaranty issues.

RE: Back Enegize of Transformer

In principle, yes to both questions. You may find the LV side protection does not respond well to the inrush and may trip on energisation.

If you have a differential scheme - quite likely on a transformer that size - make sure it can trip the LV breaker. Often it trips the HV side which then inter-trips the LV side. A soak test is definitely one of those times when you want the diff scheme (or REF on a star winding) operational as it operates quickly and will minimise damage from a fault.
 

----------------------------------
  Sometimes I only open my mouth to swap feet...

RE: Back Enegize of Transformer

Hi.
In additional. I think we have good discussion about inrush currents in case of LV or HV energazing, but forgot when.

Sky72, cuky2000 are right, ask trf, manuf
Regards.
Slava

RE: Back Enegize of Transformer

I agree with Scotty with the relay settings.  You might need to adjust them if using the transformer as a step-up unit.  As long as you don't exceed the rated MVA rating of the transformer, using as a step-up should not hurt it.  We do this all the time for our pumped-storage facilities.  We use the transformers as step down for pumping and then stup up when we drain for generation.  MVA rating is the same regardless of the direction of power flow.

-TurbineGen

------------------------------------------------------------------------
If it is broken, fix it.  If it isn't broken, I'll soon fix that.

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