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Inductance Calculation of HTS Transformers with Multi-segment Windings Considering Insulation Constraints

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Abstract

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.

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Authors and Affiliations

  1. High Voltage Research Group, Niroo Research Institute, Tehran, 14686-13113, Iran

    Ahmad Moradnouri

  2. Center of Excellence in Power System Management and Control, Electrical Engineering Department, Sharif University of Technology, Tehran, 11365-11155, Iran

    Mehdi Vakilian & Mehdi Fardmanesh

  3. Electrical Machine Research Group, Niroo Research Institute, Tehran, 14686-13113, Iran

    Arsalan Hekmati

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  1. Ahmad Moradnouri
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  2. Mehdi Vakilian
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  4. Mehdi Fardmanesh
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Correspondence to Ahmad Moradnouri.

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Moradnouri, A., Vakilian, M., Hekmati, A. et al. Inductance Calculation of HTS Transformers with Multi-segment Windings Considering Insulation Constraints. J Supercond Nov Magn 34, 1329–1339 (2021). https://doi.org/10.1007/s10948-021-05850-w

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