Abstract
Present study reports experimental and computational results obtained for a switchgear, where its critical components such as busbars, and tulip contacts are numerically modeled. In the experiment, thermocouples are used to measure the temperature at several locations of the switchgear at operating condition. One-way coupled EMAG and CFD computations are performed to obtain eddy current losses first, then the temperature and velocity distributions are obtained for the natural convection in and out of the model that is induced by the losses. Comparison of the obtained temperature distributions show that the experimental and computational results are in similar trend in general. In order to understand the causes of local discrepancies in the results, it is considered to conduct computations on a high performance computing environment for a more realistically modelled electrical components.
| Original language | English |
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| Title of host publication | ELECO 2019 - 11th International Conference on Electrical and Electronics Engineering |
| Publisher | Institute of Electrical and Electronics Engineers Inc. |
| Pages | 116-120 |
| Number of pages | 5 |
| ISBN (Electronic) | 9786050112757 |
| DOIs | |
| Publication status | Published - Nov 2019 |
| Event | 11th International Conference on Electrical and Electronics Engineering, ELECO 2019 - Bursa, Turkey Duration: 28 Nov 2019 → 30 Nov 2019 |
Publication series
| Name | ELECO 2019 - 11th International Conference on Electrical and Electronics Engineering |
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Conference
| Conference | 11th International Conference on Electrical and Electronics Engineering, ELECO 2019 |
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| Country/Territory | Turkey |
| City | Bursa |
| Period | 28/11/19 → 30/11/19 |
Bibliographical note
Publisher Copyright:© 2019 Chamber of Turkish Electrical Engineers.
Funding
In conclusion, this study is focused on observing the temperature distribution on specified points of the conductors, the air flow behavior inside the enclosure and the verification of simulation results with experiment. Electromagnetic losses, obtained in EMAG, are taken as thermal load input to CFD, which are very important for accuracy of the results. Although the study is performed on a simplified model, it gives several hints for complicated designs of MV switchgear. Without doing several experiments, we can improve the design knowing the air flow behavior and the hottest spots along the current path. Main reasons for the difference between simulation and experimental results are simplifications on 3D model (especially on conductors), mesh quality, electromagnetic/thermal properties of materials which are dependent on temperature and not being able to implement all experimental conditions to simulation environment. Our further study will focus on more complicated designs and on improving accuracy of the results. Accuracy of the results are considered to be improved by giving extra boundary conditions on electrical components (current transformer, tulip contacts, etc.) or modelling them with more details and observing experiments carefully in order to apply all constraints as boundary conditions for both EMAG and CFD. In addition, two-way coupled simulation will be performed to take into account the temperature dependencies of material properties. Meshing will be still key factor and will be optimized in terms of accuracy and computing time. 1 blank line using 9-point font with single spacing Acknowledgment 1 blank line using 9-point font with single spacing This study is initiated and funded by Siemens and academically supported by İTÜNOVA Technology Transfer Office with contract number EM-02-N-01-19-12-N-QQM-227259-13272. The authors thank to test engineers Mr. Utku Barış Kalkancı and Hilmi Coşkun Öztürk of Siemens A.Ş. for support on obtaining experimental results and Siemens Gebze R&D group manager Tahsin Karadeniz for his valuable contributions and assistance. 1 blank line using 9-point font with single spacing 6. References 1 blank line using 9-point font with single spacing [1] L. Song, "Transformer Short Circuit Current Calculation and Solutions", B.S. thesis, Elec. Eng., Novia Univ. App. Sci., Vaasa, SE, 2013. [2] Siemens AG. (2019, Sep 3). Power Engineering Guide (8.0) [Document].Available:https://profiles.siemens.com/pub/do wnloads/get?formSubmitGuid=6cf24691-de3e-45f7-aaaa-91eb6a250a76. [3] R. W. Smeaton, "Switchgear and Control Handbook”, 3rd Ed., McGraw Hill, New York, USA, 1997. [4] A. Ryfa, J. Smolka, Z. Bulinski, M. Bedkowski, "Experimental determination of the convective heat transfer coefficient for a switchgear busbar system with a use of the data reconciliation method", Applied Thermal Engineering, vol. 136, pp. 541-547, Mar, 2018. [5] M. Bedkowski, J. Smolka, Z. Bulinski, A. Ryfa, "Simulation of cooling enhancement in industrial low-voltage switchgear using validated coupled CFD-EMAG model", International Journal of Thermal Sciences, vol. 111, pp. 437-449, Sep, 2016. [6] M. Bedkowski, J. Smolka, K. Banasiak, Z. Bulinski, A. J. Nowak, T. Tomanek, A. Wajda, "Coupled numerical modelling of power loss generation in busbar system of low-voltage switchgear", International Journal of Thermal Sciences, vol. 82, pp. 122-129, May, 2014. [7] High-voltage switchgear and controlgear – Part 1: Common specifications for alternating current switchgear and controlgear, IEC 62271-1, July 2017. [8] R. Anderl, P. Binde, "Simulations with NX", Carl Hanser Verlag, Munich, Germany, 2014. [9] F. P. Incropera, D. P. DeWitt, "Fundamentals of heat and mass transfer ", J. Wiley, New York, USA, 2002.
| Funders | Funder number |
|---|---|
| Siemens | |
| İTÜNOVA Technology Transfer Office | EM-02-N-01-19-12-N-QQM-227259-13272 |