Transformer models in EMTP/ATP
Transformer models in EMTP/ATP
Transformer models in EMTP/ATP
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W<strong>in</strong>d<strong>in</strong>g resistance R(f)<br />
• Their dependence on the frequency is due to<br />
- Sk<strong>in</strong> effects<br />
- Proximity effects<br />
- Eddy currents<br />
• The frequency-dependency of R is represented us<strong>in</strong>g<br />
Foster equivalent circuit (two cells)<br />
13 / 19<br />
11/6/2012<br />
Capacitive effects<br />
• Capacitances between high and low voltage w<strong>in</strong>d<strong>in</strong>gs<br />
and core<br />
• Capacitance between high voltage phases, outer legs,<br />
and grounded elements<br />
14 / 19<br />
11/6/2012
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