Reduction of Vibration and Sound-Level for a Single-Phase Power Transformer with Large Capacity

Chang Hung Hsu, Sau Lie Lee, Chia Ching Lin, Chien Sheng Liu, Shu Ying Chang, Min Fu Hsieh, Yi Mei Huang, Chao Ming Fu

Research output: Contribution to journalArticlepeer-review

35 Scopus citations


This paper presents the reduction of noise and vibration concerning the magnetostriction effects for a single-phase power transformer with a large capacity of 200 MVA. Two magnetic core shapes are investigated: 1) D-yoked core and 2) square-yoked core. The D-yoked core is used for the construction of the transformer prototype in this paper. The magnetostriction and the hysteresis loop of the core material are measured for the simulation and analysis of noise and vibration. The transformer prototype is assembled with an external clamping force applied on the core, and the core vibration and sound-level are observed. The transformer operates with a periodic excitation that may induce resonance in the core. To avoid this, a finite-element analysis is used for modal analysis to identify the natural frequencies of the core. A tank is also designed with a sufficiently rigid structure to avoid resonances. The sound-level of the fully assembled transformer prototype is measured, and it is found to have a low-noise level below 65 dB.

Original languageEnglish
Article number7151800
JournalIEEE Transactions on Magnetics
Issue number11
StatePublished - 1 Nov 2015


  • Electromagnetic analysis
  • magnetostriction
  • noise
  • power transformer
  • vibration


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