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Electro-Magnetic Core Design in Efficient Distribution Transformers with FEM

Hajipour, Ehsan | 2010

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 40919 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Vakilian, Mehdi
  7. Abstract:

  8. Estimation of power transformer no-load loss is a critical issue in the design of distribution transformers. Any deviation in estimation of the core losses during the design stage can lead to a financial penalty for the transformer manufacturer. In this project an effective method is proposed to determine all components of the iron core losses applying a combination of the empirical and numerical techniques. In this method at the first stage all computable components of the core losses are calculated, using Finite Element Method (FEM) for modeling and analysis of the transformer iron core magnetic problem. This method takes into account magnetic sheets anisotropy, joint losses and stacking holes. A Quadratic Programming (QP) optimization technique is employed to estimate the incomputable components of the core losses. This method provides a chance for improvement of the core loss estimation over the time when more measured data become available. The optimization process handles the singular deviations caused by different manufacturing machineries and labor during the transformer manufacturing and overhaul process. Thus, application of this method enables different companies to obtain different results for the same designs and materials employed, using their past recorded measurement data. Effectiveness of this method is verified by inspection of 54 full size distribution transformer measurement data.

  9. Keywords:
  10. Distribution Transformer ; Finite Element Method ; Core Loss ; Building Factor

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