Transformer Core Loss and Hysterisis Losses.
Transformer Core Loss and Hysterisis Losses.
(OP)
I would like to know why the core loss resistance and magnetizing reactance is parallel to the primary voltage in the transformer equivalent circuit?






RE: Transformer Core Loss and Hysterisis Losses.
RE: Transformer Core Loss and Hysterisis Losses.
RE: Transformer Core Loss and Hysterisis Losses.
Another way to look at it is to go back to the derivation of the Tee equivalent circuit representation of coupled linear magnetic circuits. That is given on pages 1-7 of Krause's "Analysis of Electrical Machinery" here:
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RE: Transformer Core Loss and Hysterisis Losses.
This is just for convenience in calculating the equivalent impedance elements. You could have a resistance in series with a reactance and be equally valid. The parallel combination is the Thevenin equivalent of the series combination.
RE: Transformer Core Loss and Hysterisis Losses.
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Eng-tips forums: The best place on the web for engineering discussions.
RE: Transformer Core Loss and Hysterisis Losses.
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Eng-tips forums: The best place on the web for engineering discussions.
RE: Transformer Core Loss and Hysterisis Losses.
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Eng-tips forums: The best place on the web for engineering discussions.
RE: Transformer Core Loss and Hysterisis Losses.
You can see the transformer primary supplies a constant excitation current, plus a current equal (after turns trnasformation) to the secondeary current. So naturally these branches are parallel.
All of the above has neglected the leakage reactance which is a small effect, but certainly necessary to predict the load-dependent voltage droop accross the transformer. Does not change the logic which led us to place the excitation and secondary branches in parallel fed from the primary.
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RE: Transformer Core Loss and Hysterisis Losses.