Journal ArticleDOI
Analytical estimation of short circuit axial and radial forces on power transformers windings
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TLDR
In this article, an analytical method is proposed to calculate exerted axial and radial forces on the high and low voltage (LV) windings in core type power transformers, which includes non-linear characteristics of the core materials, eddy currents effects, symmetrical and asymmetrical hysteresis loops of the used laminates.Abstract:
In this study, an analytical method is proposed to calculate exerted axial and radial forces on the high and low voltage (LV) windings in core type power transformers. Hence, an analytical modelling approach is proposed to compute short circuit currents in the transient mode and steady state. The proposed model includes non-linear characteristics of the core materials, eddy currents effects, symmetrical and asymmetrical hysteresis loops of the used laminates. Then, exerted axial and radial forces on the high and LV windings are analytically computed in the transient mode and steady state. In order to certify obtained analytical results, the two-dimensional (2D) time stepping finite element method (TSFEM) is utilised to determine aforementioned forces. In this modelling approach, the geometrical, electrical and magnetic characteristics of the core type transformer under short circuit fault are taken into account. Furthermore, three-dimensional TSFEM is employed to verify the analytical and 2D TSFEMs results.read more
Citations
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Derating of transformers under non-linear load current and non-sinusoidal voltage – an overview
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Identification of Power Transformer Winding Mechanical Fault Types Based on Online IFRA by Support Vector Machine
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Derating of distribution transformers under non-linear loads using a combined analytical-finite elements approach
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Journal ArticleDOI
Impacts of ferroresonance and inrush current forces on transformer windings
TL;DR: In this article, the electromagnetic forces exerted on the windings are computed in ferroresonance condition and compared with that of the inrush current for a typical power transformer, and the Jiles-Atherton vector hysteresis model is employed in conjunction with finite element method (FEM) to simulate the laminated grain-oriented steel core.
Journal ArticleDOI
An algorithm for fast calculation of short circuit forces in high current busbars of electric arc furnace transformers based on method of images
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References
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Journal ArticleDOI
Transfer function method to diagnose axial displacement and radial deformation of transformer windings
TL;DR: In this article, a transfer function method is presented as a tool to detect axial displacement and radial deformation of transformer windings using two test transformers and detailed mathematical models were developed for the test objects and a comparison was carried out between measured and calculated results.
Journal ArticleDOI
Experimental Verification and Finite Element Analysis of Short-Circuit Electromagnetic Force for Dry-Type Transformer
TL;DR: In this article, the authors used experimental verification and finite element analysis (FEA) for short-circuit force prediction of a 50 kVA dry-type transformer, where they modeled high voltage (HV) winding into 20 sections and low voltage winding into 22 sections as similar as those windings of a model transformer.
Journal ArticleDOI
Three- and Two-Dimensional Finite-Element Computation of Inrush Current and Short-Circuit Electromagnetic Forces on Windings of a Three-Phase Core-Type Power Transformer
TL;DR: In this paper, a three-phase, three-legged 66/11 kV, 40 MVA power transformer was modeled in two and three dimensions and the forces exerted on the windings due to inrush currents in many regions were larger than those due to short-circuit currents.
Journal ArticleDOI
Computation of inrush current forces on transformer windings
TL;DR: In this article, three-dimensional computations have been carried out on a typical single-phase power transformer using the Hopfield neural network energy minimization technique, as well as comparison with short circuit forces.
Journal ArticleDOI
Analysis of Short-Circuit Performance of Split-Winding Transformer Using Coupled Field-Circuit Approach
G. B. Kumbhar,S.V. Kulkarni +1 more
TL;DR: In this paper, the axial short-circuit forces in split-winding transformers were analyzed under both preset and postset shortcircuit test conditions, and it was shown that even though postset method eliminates inrush related problems, there is not much respite in short circuit forces.
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