Reduction of eddy current losses around bushing holes on the top-plate of a high efficient transformer
Abstract
Low
voltage winding leads cause local eddy current losses in top-plate of the
transformer tank. In this paper, this loss component which also causes local
hot spots is investigated. Top-plate design is modified using stainless steel
non-magnetic material, around the low voltage bushing holes. Manufacturing
issues and cost as well as power losses are considered as main criteria during
modification study. Magnetic flux distributions and eddy current losses are
analysed and compared for different designs. Comparisons are based on 3D finite
element simulations and experimental studies. Obtained results show that,
insertion of single I-shaped stainless steel plate reduces eddy current losses
around low voltage bushing holes to nearly zero.
References
- M. Scholand, T. Blackburn, P. Hopkinson ve M. Sampat, «SEAD Distribution Transformer Report Part 3: Energy Efficient Class Definitions,» 2013.
- P. Waide ve M. Scholand, «The potential for global energy savings from high-efficiency distribution transformers - Final report,» 2014.
- «EN 50588-1, Medium power transformers 50 Hz, with highest voltage for equipment not exceeding 36 kV - Part 1: General requirements,» 2015.
- M. Venegas Vega, R. Escarela Perez ve T. Niewierowicz, «3D Finite Element Estimation of Stray Losses in Three-Phase Transformers,» J Appl Comp Sci, cilt 16, no. 1, pp. 89-99, 2008.
- L. Kralj ve D. Milijavec, «Stray losses in power transformer tank walls and construction parts,» Int Conf Electr Mach, Rome, 2010.
- L. Susnjic, Z. Haznadar ve Z. Valkovic, «3D finite-element determination of stray losses in power transformer,» Electr Pow Syst Res, cilt 78, no. 1, pp. 1814-1818, 2008.
- Y. Kim, J. Lee, H. Ahn ve S. Hahn, «Numerical Investigation for Stray Loss Analysis of Power Transformer,» Intl C Electr Mach Sy, Busan, 2013.
- C. Adalja ve M. Jain, «Analysis of Stray Losses in Power Transformers by 3-D Magnetic Field Simulation,» 15th National Power Systems Conf, India, 2008.
- J. Olivares, R. Escarela Perez, S. Kulkarni , F. deLeon ve M. Venegas Vega, «2D finite-element determination of tank wall losses in pad-mounted transformers,» Electr Pow Syst Res, cilt 71, no. 1, pp. 179-185, 2004.
- S. Magdaleno Adame, J. Olivares Galvan, Escarela R., O. Raichenko ve A. Kladas, «Hot Spots Mitigation on Tank Wall of a Power Transformer using Electromagnetic Shields,» Int C Electr Mach, Berlin, 2014.
- S. Kulkarni, J. Olivares, R. Escarela Perez, V. Lakhiani ve J. Turowski, «Evaluation of eddy current losses in the cover plates of distribution transformers,» IEE P-Sci Meas Tech, cilt 151, no. 1, pp. 313-318, 2004.
- J. Olivares Galvan, E. Campero Littlewood, J. Hernandez, R. Escarela Perez ve S. Adame, «Evaluation of Stray Losses in Throats of Distribution Transformers Using Finite Element Simulation,» Andean Region Int Conf, Ecuador, 2012.
- G. Kumbhar, S. Mahajan ve W. Collett, «Reduction of Loss and Local Overheating in the Tank of a Current Transformer,» IEEE T Power Deliver, cilt 25, no. 1, pp. 2519-2525, 2010.
Yüksek verimli transformatörlerde buşing bağlantı noktalarında meydana gelen eddy akımı kayıplarının azaltılması
Abstract
Bu
çalışmada, transformatörlerin kazan kapağı üzerinde alçak gerilim sargılarının
bağlantı uçları sebebiyle meydana gelen ve yüksek sıcaklıklara da neden olan
eddy akımı kayıpları incelenmektedir. Bu kayıpların azaltılması amacıyla kazan
kapağı tasarımı manyetik özellikli olmayan paslanmaz çelik malzeme kullanılarak
iyileştirilmektedir. Bu iyileştirme çalışması sırasında imalat koşulları ve
maliyet kriterleri de göz önünde tutulmaktadır. Farklı tasarımlar için manyetik
akı dağılımları ve eddy akımı kayıpları üç boyutlu sonlu elemanlar yöntemi
yardımıyla analiz edilmiş ve deneysel olarak da doğrulanmıştır. Elde edilen
sonuçlar, kazan kapağı üzerinde alçak gerilim buşinglerinin bağlantı yüzeyinin
paslanmaz çelikten imal edilen I-biçimli tek parça levha kullanılarak
üretilmesi sonucunda kapak üzerinde meydana gelen güç kayıplarının tamamına
yakınının ortadan kaldırılabildiğini göstermektedir.
References
- M. Scholand, T. Blackburn, P. Hopkinson ve M. Sampat, «SEAD Distribution Transformer Report Part 3: Energy Efficient Class Definitions,» 2013.
- P. Waide ve M. Scholand, «The potential for global energy savings from high-efficiency distribution transformers - Final report,» 2014.
- «EN 50588-1, Medium power transformers 50 Hz, with highest voltage for equipment not exceeding 36 kV - Part 1: General requirements,» 2015.
- M. Venegas Vega, R. Escarela Perez ve T. Niewierowicz, «3D Finite Element Estimation of Stray Losses in Three-Phase Transformers,» J Appl Comp Sci, cilt 16, no. 1, pp. 89-99, 2008.
- L. Kralj ve D. Milijavec, «Stray losses in power transformer tank walls and construction parts,» Int Conf Electr Mach, Rome, 2010.
- L. Susnjic, Z. Haznadar ve Z. Valkovic, «3D finite-element determination of stray losses in power transformer,» Electr Pow Syst Res, cilt 78, no. 1, pp. 1814-1818, 2008.
- Y. Kim, J. Lee, H. Ahn ve S. Hahn, «Numerical Investigation for Stray Loss Analysis of Power Transformer,» Intl C Electr Mach Sy, Busan, 2013.
- C. Adalja ve M. Jain, «Analysis of Stray Losses in Power Transformers by 3-D Magnetic Field Simulation,» 15th National Power Systems Conf, India, 2008.
- J. Olivares, R. Escarela Perez, S. Kulkarni , F. deLeon ve M. Venegas Vega, «2D finite-element determination of tank wall losses in pad-mounted transformers,» Electr Pow Syst Res, cilt 71, no. 1, pp. 179-185, 2004.
- S. Magdaleno Adame, J. Olivares Galvan, Escarela R., O. Raichenko ve A. Kladas, «Hot Spots Mitigation on Tank Wall of a Power Transformer using Electromagnetic Shields,» Int C Electr Mach, Berlin, 2014.
- S. Kulkarni, J. Olivares, R. Escarela Perez, V. Lakhiani ve J. Turowski, «Evaluation of eddy current losses in the cover plates of distribution transformers,» IEE P-Sci Meas Tech, cilt 151, no. 1, pp. 313-318, 2004.
- J. Olivares Galvan, E. Campero Littlewood, J. Hernandez, R. Escarela Perez ve S. Adame, «Evaluation of Stray Losses in Throats of Distribution Transformers Using Finite Element Simulation,» Andean Region Int Conf, Ecuador, 2012.
- G. Kumbhar, S. Mahajan ve W. Collett, «Reduction of Loss and Local Overheating in the Tank of a Current Transformer,» IEEE T Power Deliver, cilt 25, no. 1, pp. 2519-2525, 2010.
Details
| Subjects | Electrical Engineering |
|---|---|
| Journal Section | Research Articles |
| Authors | |
| Publication Date | August 1, 2017 |
| Submission Date | January 12, 2017 |
| Acceptance Date | June 1, 2017 |
| Published in Issue | Year 2017 Volume: 21 Issue: 4 |
Cite
Sakarya University Journal of Science (SAUJS)