NDLI: A Novel Unsymmetrical Multi-Segment Concentric Winding Scheme for Electromagnetic Force and Leakage Flux Mitigation in HTS Power Transformers

Content Provider	IEEE Xplore Digital Library
Author	Ghabeli, A. Yazdani-Asrami, M. Gholamian, S.A.
Copyright Year	2002
Abstract	The high axial and radial forces caused by short circuits can be very detrimental to high-temperature superconductor (HTS) windings of HTS transformers. Axial forces above the HTS winding critical value cause irreversible effects on the critical current reduction of an HTS tape. Such forces can disrupt the normal performance of HTS transformers and lead to quench phenomenon and insulation breakdown. Accordingly, any optimization in the design of HTS transformers that decreases the leakage flux and electromagnetic forces is very significant. This paper presents a novel method for reduction of leakage flux and thereby electromagnetic force in the windings of an HTS power transformer. First, concentric primary and secondary windings are subdivided into certain number of segments. In the next step, the proposed method, which is based on selecting the optimum distributive ratios for the created subwindings, is applied to the windings. In order to verify the effectiveness of the proposed method, an advanced finite-element method has been used. The method uses accurate and nonlinear E-J power law for defining the superconductivity characteristic. The results showed the efficiency of the applied method to mitigate the radial and axial leakage flux and thereby electromagnetic forces in the windings of the HTS transformer.
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	1
Ending Page	10
Page Count	10
File Size	2969709
File Format	PDF
ISSN	10518223
Volume Number	25
Issue Number	6
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	High-temperature superconductors Windings Magnetic flux leakage Electromagnetic forces Finite element analysis Power transformers Leakage Flux HTS power Transformer Finite Element Method Concentric winding scheme Electromagnetic force leakage flux electromagnetic force finite-element method (FEM) high-temperature superconductor (HTS) power transformer
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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A Novel Unsymmetrical Multi-Segment Concentric Winding Scheme for Electromagnetic Force and Leakage Flux Mitigation in HTS Power Transformers

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A Novel Unsymmetrical Multi-Segment Concentric Winding Scheme for Electromagnetic Force and Leakage Flux Mitigation in HTS Power Transformers