PROJECT TITLE :

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

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 on top of the HTS winding essential value cause irreversible effects on the critical current reduction of an HTS tape. Such forces can disrupt the traditional 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 terribly important. This paper presents a unique method for reduction of leakage flux and thereby electromagnetic force within the windings of an HTS power transformer. First, concentric primary and secondary windings are subdivided into certain range of segments. In the following step, the proposed method, which is predicated on selecting the optimum distributive ratios for the created subwindings, is applied to the windings. So as to verify the effectiveness of the proposed technique, a sophisticated finite-part method has been used. The tactic uses correct and nonlinear E-J power law for outlining the superconductivity characteristic. The results showed the efficiency of the applied method to mitigate the radial and axial leakage flux and thereby electromagnetic forces within the windings of the HTS transformer.