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Analytical and Numerical Calculation of Sub-Conductor Circulationg Currents in Roebel Bars of Hydro Generators

Research output: Chapter in book/report/conference proceeding › Conference contribution › Research › peer review

Authors

  • Torben Fricke
  • Alexander Rehfeldt
  • Babette Schwarz
  • Eva Bresemann
  • Bernd Ponick

Research Organisations

External Research Organisations

  • Voith GmbH & Co. KGaA
  • Baker Hughes INTEQ
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  • Citations
    • Citation Indexes: 1
  • Captures
    • Readers: 5
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Details

Original languageEnglish
Title of host publicationProceedings
Subtitle of host publication2018 23rd International Conference on Electrical Machines, ICEM 2018
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages1074-1079
Number of pages6
ISBN (electronic)9781538624777
Publication statusPublished - 24 Oct 2018
Event23rd International Conference on Electrical Machines, ICEM 2018 - Alexandroupoli, Greece
Duration: 3 Sept 2018 → 6 Sept 2018

Abstract

This paper investigates the prediction of sub-conductor circulating currents in hydro generators. First, an analytical field calculation approach, based on Biot-Savart law and Schwarz-Christoffel mappings is presented. Different field effects of both the stator and rotor are investigated and discussed. The analytical method also covers the calculation of the impedance matrix for a Roebel bar including effects inside the stator core. Finally, sub-conductor circulating currents are calculated based on the field calculation and the impedance matrix. The analytically calculated field and sub-conductor currents are compared to FE simulation results of a generator. One of the Roebel bars is modelled in detail inside the core as well as in the end region, including twelve twisted sub-conductors.

Keywords

    Conformal mapping, Energy efficiency, Finite element analysis, Hydroelectric power generation

ASJC Scopus subject areas

Sustainable Development Goals

Cite this

Analytical and Numerical Calculation of Sub-Conductor Circulationg Currents in Roebel Bars of Hydro Generators. / Fricke, Torben; Rehfeldt, Alexander; Schwarz, Babette et al.
Proceedings: 2018 23rd International Conference on Electrical Machines, ICEM 2018. Institute of Electrical and Electronics Engineers Inc., 2018. p. 1074-1079 8506880.

Research output: Chapter in book/report/conference proceeding › Conference contribution › Research › peer review

Fricke, T, Rehfeldt, A, Schwarz, B, Bresemann, E & Ponick, B 2018, Analytical and Numerical Calculation of Sub-Conductor Circulationg Currents in Roebel Bars of Hydro Generators. in Proceedings: 2018 23rd International Conference on Electrical Machines, ICEM 2018., 8506880, Institute of Electrical and Electronics Engineers Inc., pp. 1074-1079, 23rd International Conference on Electrical Machines, ICEM 2018, Alexandroupoli, Greece, 3 Sept 2018. https://doi.org/10.1109/icelmach.2018.8506880
Fricke, T., Rehfeldt, A., Schwarz, B., Bresemann, E., & Ponick, B. (2018). Analytical and Numerical Calculation of Sub-Conductor Circulationg Currents in Roebel Bars of Hydro Generators. In Proceedings: 2018 23rd International Conference on Electrical Machines, ICEM 2018 (pp. 1074-1079). Article 8506880 Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/icelmach.2018.8506880
Fricke T, Rehfeldt A, Schwarz B, Bresemann E, Ponick B. Analytical and Numerical Calculation of Sub-Conductor Circulationg Currents in Roebel Bars of Hydro Generators. In Proceedings: 2018 23rd International Conference on Electrical Machines, ICEM 2018. Institute of Electrical and Electronics Engineers Inc. 2018. p. 1074-1079. 8506880 doi: 10.1109/icelmach.2018.8506880
Fricke, Torben ; Rehfeldt, Alexander ; Schwarz, Babette et al. / Analytical and Numerical Calculation of Sub-Conductor Circulationg Currents in Roebel Bars of Hydro Generators. Proceedings: 2018 23rd International Conference on Electrical Machines, ICEM 2018. Institute of Electrical and Electronics Engineers Inc., 2018. pp. 1074-1079
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abstract = "This paper investigates the prediction of sub-conductor circulating currents in hydro generators. First, an analytical field calculation approach, based on Biot-Savart law and Schwarz-Christoffel mappings is presented. Different field effects of both the stator and rotor are investigated and discussed. The analytical method also covers the calculation of the impedance matrix for a Roebel bar including effects inside the stator core. Finally, sub-conductor circulating currents are calculated based on the field calculation and the impedance matrix. The analytically calculated field and sub-conductor currents are compared to FE simulation results of a generator. One of the Roebel bars is modelled in detail inside the core as well as in the end region, including twelve twisted sub-conductors.",
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AU - Fricke, Torben

AU - Rehfeldt, Alexander

AU - Schwarz, Babette

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AU - Ponick, Bernd

N1 - Publisher Copyright: © 2018 IEEE. Copyright: Copyright 2019 Elsevier B.V., All rights reserved.

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N2 - This paper investigates the prediction of sub-conductor circulating currents in hydro generators. First, an analytical field calculation approach, based on Biot-Savart law and Schwarz-Christoffel mappings is presented. Different field effects of both the stator and rotor are investigated and discussed. The analytical method also covers the calculation of the impedance matrix for a Roebel bar including effects inside the stator core. Finally, sub-conductor circulating currents are calculated based on the field calculation and the impedance matrix. The analytically calculated field and sub-conductor currents are compared to FE simulation results of a generator. One of the Roebel bars is modelled in detail inside the core as well as in the end region, including twelve twisted sub-conductors.

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