Journal ArticleDOI
Effects of eddy currents in transformer windings
P.L. Dowell
- Vol. 113, Iss: 8, pp 1387-1394
TLDR
In this article, the effect of eddy currents on transformer windings is considered and a method is derived for calculating the variation of winding resistance and leakage inductance with frequency for transformers with single-layer, multilayer and sectionalised windings.Abstract:
The effects of eddy currents in transformer windings are considered, and a method is derived for calculating the variation of winding resistance and leakage inductance with frequency for transformers with single-layer, multilayer and sectionalised windings. The method consists in dividing the winding into portions, calculating the d.c. resistances and d.c. leakage inductances of each of these portions, and then multiplying the d.c. values by appropriate factors to obtain the corresponding a.c. values. These a.c. values are then referred to, say, the primary winding and summed to give the total winding resistance and leakage inductance of the transformer. Formulas are derived and quoted for calculating the d.c. resistances and leakage inductances of the winding portions. Theoretical expressions are derived for the variation with frequency etc. of the factors by which the d.c. values must be multiplied to obtain the corresponding a.c. values. These expressions are presented in the form of graphs, permitting the factors to be read as required.read more
Citations
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Proceedings ArticleDOI
Evaluation of circulating current suppression methods for parallel interleaved inverters
TL;DR: In this article, a comparative evaluation of the different methods to avoid/suppress the circulating current between the parallel interleaved VSCs is presented, where the losses and the volume of the inductive components and the semiconductor losses are evaluated for the WECS with different circulating current suppression methods.
Journal ArticleDOI
Analysis of Effect of Winding Interleaving on Leakage Inductance and Winding Loss of High Frequency Transformers
TL;DR: In this article, the effect of interleaving on leakage inductance and AC resistance in high frequency transformers has been investigated using a one-dimensional model for magnetic components, based on which a frequency dependent analytical method was proposed.
Proceedings ArticleDOI
An AC resistance optimization method applicable for inductor and transformer windings with full layers and partial layers
TL;DR: In this paper, an ac resistance optimization method applicable for both inductor and transformer windings with full layers sand partial layers is proposed, which treats the number of layers of the windings as a design variable instead of as a predefined parameter.
Dissertation
Modélisation électromagnétique 3D d’inducteurs multibrins – Développement d’une méthode intégrale parallélisée
TL;DR: In this paper, a logiciel de calcul parallele devolu a la modelisation electromagnetique 3D d'inducteurs multibrins is presented, based on a methode originale de construction de la geometrie des inducteurs.
Proceedings ArticleDOI
An accuracy assessment of 2-D vs. 3-D finite element models for ferrite core, sheet wound transformers
J.D. Lavers,E.D. Lavers +1 more
TL;DR: In this paper, the authors examined the parameter estimates for representative high frequency transformer designs with a view to assessing the errors that might be expected when 2-D approximate finite element models are used for the purpose of parameter extraction.
References
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Journal ArticleDOI
Effective resistance to alternating currents of multilayer windings
Edward Bennett,Sidney C. Larson +1 more
TL;DR: In this article, a multilayer winding carrying an alternating current, such as the windings illustrated in figures 1, 2, and 3, each layer of copper lies in the alternating magnetic field set up by the current in all the other layers.
Journal ArticleDOI
Eddy Currents in Large Slot-Wound Conductors
TL;DR: In this article, the authors discuss the more important causes of eddy currents in heavy conductors carrying alternating currents and surrounded on three sides by iron, and propose a method to identify the most important causes.
Journal ArticleDOI
Effective Resistance to Alternating Currents of Multilayer Windings
Journal ArticleDOI
Eddy-Current Losses in Cylindrical Conductors, with Special Applications to the Alternating Current Resistances of Short Coils
TL;DR: In this article, it is shown that a considerable proportion of the effective resistance of inductive coils when used at radio frequencies is caused by the eddy-currents set up in the wires of the coils by the alternating magnetic field in which they are situated, and that in extreme cases the alternating current resistance may amount to more than one hundred times the direct current resistance.
Journal ArticleDOI
Heat Losses in the Conductors of Alternating-Current Machines
TL;DR: In this article, the authors show how hyperbolic functions of complex angles may be applied to the solution of the problem of heat losses in rectangular conductors that are embedded in open slots.