×
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

Transformer modelling for switching transient

Transformer modelling for switching transient

Transformer modelling for switching transient

(OP)
Dear all,

I am doing a transient study for which the transofmer data from the manufacturer is not easy to provide.

Concerning that issue i have two questions:
1- are there any recommended values of the transformer capacitances (transformer is 40 MVA YYN0 132/33 kV). I will be calculating switching transients (slow front) but may also consider fast fronts for re-strikes. Would considering/neglecting the capacitances affect the calculations?
There are some proposed values from not so official sources but with quite a large range (IEEE industrial applications society magazine).
2- would the phase shift of the transformer affect the calculations? I have an inverter transformer with a phase shift of 10°. This is not available from the model.

Thank you.

RE: Transformer modelling for switching transient

Adam,
as regards the influence of transformer capacitance on switching transients, it depends on where the circuit breaker is: if you are simulating transformer switching-off transient the effect of its capacitance is not negligible; the same applies if you are studing a phenomenon that could involve the transformer itself (i.e. transformer-terminated lines or energization of lines through a transformer). If you are performing a switching transient study on a large network, the effect is much less important.
As regards phase shift it could be more important for harmonic studies rather than fast transients ones

Si duri puer ingeni videtur,
preconem facias vel architectum.

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