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# transformer capacitance and inductance

- To: <femm@yahoogroups.com>
- Subject: transformer capacitance and inductance
- From: "Erdal Bizkevelci" <erdal@ieee.org>
- Date: Fri, 21 Sep 2001 11:57:15 +0300
- References: <4.3.2.7.2.20010919075601.00abc5c0@staff-mailin.lboro.ac.uk>

Hi everybody, I'm trying to calculate transformer leakage inductance and stray capacitances. Thanks to Cornelius H. Paul's notes on 'Calculating Transformer Inductances with Femm' and Jim Bloor's valuable favour, Femm gave some results for leakage inductance. Now I have two questions: 1) What is the effect of frequency on the leakage inductance? When I change the frequency, flux lines and magnetic energy integral changes. Is this logical? 2) What about stray capacitances? I think making the secondary current zero (open circuit the secondary winding) and applying the nominal voltage to primary winding and calculating the stored energy in the electric field may help us. After obtaining the stored energy, by using W=0.5*C*V^2 (half of the product of the capacitance and the square of applied voltage is equal to the energy stored in the electric field. ) we can obtain capacitance value. But how can we apply voltage to primary and how can we integrate the electric field over the volume (of course an area in 2D) by using FEMM? And if I manage to calculate this, what is the dependency of capacitance to frequency? Is there any relation between the frequency and the stored energy in the electric field ? ( Like the relation in the leakage inductance calculations) ? Thanks. Erdal Bizkevelci Middle East Technical University Tubitak Bilten 06531 Ankara/TURKEY

- References:
  - Re: [femm] mutual inductance
    - From: Keith Gregory <k.gregory@lboro.ac.uk>

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