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Modeling of power transmission and stress grading for corona protection

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Abstract

Electrical high voltage (HV) machines are prone to corona discharges leading to power losses as well as damage of the insulating layer. Many different techniques are applied as corona protection and computational methods aid to select the best design. In this paper we develop a reduced-order model in 1D estimating electric field and temperature distribution of a conductor wrapped with different layers, as usual for HV-machines. Many assumptions and simplifications are undertaken for this 1D model, therefore, we compare its results to a direct numerical simulation in 3D quantitatively. Both models are transient and nonlinear, giving a possibility to quickly estimate in 1D or fully compute in 3D by a computational cost. Such tools enable understanding, evaluation, and optimization of corona shielding systems for multilayered coils.

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Notes

  1. Intel Core i7-2600 at 3.4 GHz running on Ubuntu server with Linux 4.4.0-64-generic

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Acknowledgements

T. Zohdi gratefully acknowledges the generous support of the Siemens corporation during the course of this research. B. E. Abali’s work was supported by a Grant from the Max Kade Foundation to the University of California, Berkeley.

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  1. Department of Mechanical Engineering, University of California, Berkeley, Berkeley, CA, USA

    T. I. Zohdi & B. E. Abali

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  1. T. I. Zohdi
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  2. B. E. Abali
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Correspondence to B. E. Abali.

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Zohdi, T.I., Abali, B.E. Modeling of power transmission and stress grading for corona protection. Comput Mech 62, 411–420 (2018). https://doi.org/10.1007/s00466-017-1504-2

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