The Transactions of the Korean Institute of Power Electronics (전력전자학회논문지)

The Korean Institute of Power Electronics (전력전자학회)
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Power Loss Analysis of Transformer Caused By Current Harmonics

전류 고조파에 기인하는 변압기 손실 해석

  • Jang, Seungyong (School of Electrical Eng., Chungbuk National University) ;
  • Han, Sanghoon (School of Electrical Eng., Chungbuk National University) ;
  • Choi, Jaeho (School of Electrical Eng., Chungbuk National University)
  • Received : 2015.10.23
  • Accepted : 2015.12.19
  • Published : 2016.02.20
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Abstract

This study investigates transformer losses caused by current harmonics. Electrical transformers are designed to work under sinusoidal voltage and current waves at a rated frequency. Recently, various nonlinear loads, such as power electronic converters, are connected to a power system; these converters generate current harmonics. Current harmonics increase power loss in transformers, which results in several problems, including temperature increase of the transformer and insulation damage. These problems will eventually shorten the operational life of the transformer. In this study, different types of losses caused by current harmonics in three-phase transformers are studied under linear and nonlinear load conditions. Linear loads are simulated and experimented on using pure resistance load, whereas nonlinear loads are simulated and experimented on using a three-phase twelve-pulse thyristor full-bridge rectifier. The different types of losses in three-phase transformers are evaluated analytically through the experimental result and simulation in PSiM.

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References

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