Journal ArticleDOI
Effects of eddy currents in transformer windings
P.L. Dowell
- Vol. 113, Iss: 8, pp 1387-1394
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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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Journal ArticleDOI
Analysis and Verification of Leakage Inductance Calculation in DAB Converters Based on High-Frequency Toroidal Transformers under Different Design Scenarios
Haris Ataullah,Taosif Iqbal,Ihsan Ullah Khalil,Alakchar Mohammad,Nasim Ullah,Mohamed Emad Farrag +5 more
TL;DR: In this paper , the design of a high-frequency toroidal transformer has been explained in detail using the ANSYS Maxwell platform, and various parameters, such as leakage inductance, magnetic flux density, magnetic field strength and uniform magnetic flux line are analyzed using finite element analysis.
Effect of fast transients on distribution transformer insulation: switching transients modelling and material research
Tom Sels,H De Herdt,J Lopez-Roldan,Jiri Karas,Daniel Van Dommelen,Ronnie Belmans,Marjan Popov,L. van der Sluis +7 more
TL;DR: In this paper, a numerical model of a transformer and a circuit breaker are first combined and weighted against laboratory measurements to improve the accuracy of the overall model, the transformer model is extended with a frequency dependent loss model, and the sensitivity of the electrical insulation against these high frequency disturbances superimposed on the 50 Hz main voltage.
Proceedings ArticleDOI
A study on copper loss minimization of air-core reactor for high frequency switching power converter
Takaaki Ibuchi,Tsuyoshi Funaki +1 more
TL;DR: In this paper, a model for the calculation of winding AC resistance of air-core solenoids is presented, which includes the influence of skin and proximity effects, and verifies the adequacy of this model in the high-frequency region on the basis of measured frequency characteristics of the impedance.
Proceedings ArticleDOI
PCB Winding Loss Model and Design for Push-pull Transformer
TL;DR: In this article, the authors introduced a model for the winding current FFT decomposition and magnetic motive force (MMF) analysis of a push-pull transformer with four windings and two central taps.
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.