Hello everyone,
i would like to compare the leakage inductance on the primary side of different transformer geometries.
I simulated a three winding transformer with an UI Core.
On one leg i have the splitted primary winding and on top one secondary winding and the same on the other leg of the core.
Now I calculate the inductance matrix. When I try to calculate the leakage inductance as described in "Induktivitäten in der
Leistungselektronik" (Albach) I will get an negative primary leakage inductance.
As described in "Avoiding the Use of Negative Inductances and Resistances in Modeling ThreeWinding Transformers for Computer Simulations " this can be right, but I don't know how to interprete the negative inductance because I want to compare it with the other transformers.
Thanks for your help.
Hello Patrick,
your calculations are correct, for some winding arrangements od three-winding transformers is the inductance of middle winding negative, you can also measure it. But based on measurements on transformer in our lab, the inductance is much smaller in comparison with first and third winding. You can look at the reactance as at a capacity, but only for one rated frequency.
I hope I have helped you a little.
Jan
Pleased to welcome Patrick!
A negative inductance is the "price" of the idealization of the transformer. If we take the model of the transformer taking into account all the influencing factors (the spatial location of the windings, the configuration of the magnetic circuit, etc.), then the negative inductance will be absent.
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