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Inductance calculation of HTS transformers with multi-segment windings considering insulation constraints

Moradnouri, A ; Sharif University of Technology | 2021

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  1. Type of Document: Article
  2. DOI: 10.1007/s10948-021-05850-w
  3. Publisher: Springer , 2021
  4. Abstract:
  5. High-temperature superconducting (HTS) transformers with multi-segment windings have been proposed in earlier literatures for the hysteresis loss reduction and short circuit electromagnetic force mitigation. The optimum distributive ratios for these multi-segment windings have been determined in earlier literatures. Asymmetrical seven segment winding with its optimum distributive ratio (k = 1/12) results in minimization of short circuit electromagnetic forces under normal tap and any adjusted tap. However, insulation design and leakage inductance calculation for the multi-segment winding of an HTS transformer have not been addressed in past literatures. Insulation design is one of the most crucial aspects in the transformer design, especially for high voltage power transformers. The analysis and optimization of the electric field distribution over the winding’s segments insulation in these HTS transformers provide the required dimensions for precise determination of the leakage inductances. In this paper, for the first time, winding insulation design and leakage inductance calculation of a 200 MVA, 230/20 kV HTS transformer with asymmetrical seven segment winding (and k of 1/12), are carried out. The analytical method besides a two-dimensional (2D) finite element method (FEM), through COMSOL Multiphysics software, is utilized for insulation design and calculation of leakage inductances of this transformer. © 2021, The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature
  6. Keywords:
  7. Electric fields ; Electric insulation ; High temperature superconductors ; Inductance ; Power transformers ; Winding ; Circuit electromagnetic ; Comsol multiphysics ; Electric field distributions ; High temperature superconducting transformers ; High-voltage power transformers ; Inductance calculation ; Precise determinations ; Two dimensional (2D) finite element method ; Electric windings
  8. Source: Journal of Superconductivity and Novel Magnetism ; Volume 34, Issue 5 , 2021 , Pages 1329-1339 ; 15571939 (ISSN)
  9. URL: https://link.springer.com/article/10.1007/s10948-021-05850-w