×
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

Power Transformer Capacitance?

Power Transformer Capacitance?

Power Transformer Capacitance?

(OP)
Can anybody tell me what to expect for values of coupling capacitance between the windings and between the windings and core of power transformers. I'm particularly interested in 3 ph transformers rated at between 7 MVA and 100 MVA, with primary voltage of 72 kV L-L. Any help will be greatly appreciated. Thanks.

RE: Power Transformer Capacitance?

Why you want to know that ? Capacitance exists but reactance is much higher and nobody calculate transformer capacitance.

RE: Power Transformer Capacitance?

(OP)
To bobziva
On high impedance grounding systems (and ungrounded systems) the capacitance of the transmission and sub-transmission lines as well as that of lightning arresters and transformers (of all types) the reference pathway is through capacitive coupling. It's this path that is of concern to me.

RE: Power Transformer Capacitance?

Suggestion: The transformer winding capacitance to ground will vary according to BIL anywhere from 4 microfarads to 10 microfarads

RE: Power Transformer Capacitance?

Suggestion: Reference:
1. IEEE Std 399-1997 IEEE Recommended Practice for Industrial and Commercial Power Systems Analysis, (Brown Book)
Figure 11-34 Typical values of transformer winding capacitance to ground

RE: Power Transformer Capacitance?

(OP)
I wish to thank all that have responded. You have pointed me in the correct direction.

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