×
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

GSU transformer connection

GSU transformer connection

GSU transformer connection

(OP)
Hello,
I was wondering if someone could suggest pro's and con's to the following configuration I have seen at a hydroelectric generating facility:

Generator: High resistance grounded

GSU trasformer: ungrounded wye (4.2kV)/ delta (69kV).

There is one station service transformer on the 4.2kV system (delta-grounded wye 4.2kv-600V). Apart from this the rest of the 4.2kV system is only instrument transformers and some surge arrestor and capacitors.

Thanks!

RE: GSU transformer connection

Something in particular you are concerned about?  

RE: GSU transformer connection

(OP)
Well to be quite honest: My inexperience in the matter and the fact that I rarely see this connection.

I am guessing that that one would go for this connection over a delta-delta MPT as the delta-wye is more readily available?

Cheers.

RE: GSU transformer connection

Probably started with a requirement that the 69 kV connection be delta, for whatever reason.  The generator should be grounded via high resistance grounding, normally at the generator.  This rules out a grounded wye connection on the low side of the GSU.  So the generator grounding is OK for protecting the generator, the aux transformer delta-wye works out OK.  The ungrounded wye is a bit non-typical - perhaps it had already been ordered before it was determined that it shouldn't be grounded.   

RE: GSU transformer connection

(OP)
Thanks dpc.

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