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Determination of Eddy Current Losses in Power Transformer Tank and Analysis of Methods for Reduction of These Losses

Motalleb, Mehdi | 2008

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 39355 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Abbaspour Tehranifard, Ali; Vakilian, Mehdi
  7. Abstract:
  8. The leads with heavy current passing through the covering plates, and the winding in a transformer, are sources of eddy current losses. Due to this loss some regions of tank wall are subject to serious local overheating. It affects the safety and reliability of this expensive bject and power delivery.Heavy current in large power transformers and special type transformers give rise to a concentrated passage of eddy currents which in turn cause high local losses and overheating in the metallic parts especially in the steel tank walls of transformer.This local overheating is dangerous for transformer oil and the solid insulations. Therefore the calculation of losses and proper design of covering plates beside the tank is very important for the safety and reliability of power transformers.In this thesis these eddy current losses are calculated through a new formulation by application of Finite Element Method, using FEMLAB software. These results are compared with measurement results and the computational results of two other methods: the Turowski method and a method based on application of EDMAG software.In this thesis three methods are introduced for calculation of eddy current losses:
    • Turowski method
    • A new method based on application of F.E.M. (Two & Three Dimensional)
    • Application of EDMAG software
    In both, the first, and the second method FEMLAB software is employed for numerical calculation of the magnetic field inside the different parts of transformer. The results of these three methods are compared with the measurement results.The eddy current losses are calculated for three sample transformers: the first one is a power transformer and the second one is another power transformer and third one is an arc furnace transformer. At the end, the results of TUROWSKI method and new methods and EDMAG results, are compared with measurement results. At the end the effect of tank wall shielding (for reducing the eddy losses) is introduced
  9. Keywords:
  10. Power Transformer ; Finite Element Method ; Eddy Corrent Losses

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