Electromagnetic Vibration of Power Transformer and Active Noise Reduction
Zhong Sichong1, Zhu Lihua2, Wang Qianchao1, Zhang Jiangong3, Wang Yanzhao3
1. Tianjin Key Laboratory of Advanced Technology of Electrical Engineering and Energy Tiangong University Tianjin 300387 China; 2. Tianjin University of Technology Tianjin 300384 China; 3. Wuhan Branch of China Electric Power Research Institute Co. Ltd State Key Laboratory of Power Grid Environmental Protection Wuhan 430000 China
Abstract：Due to fluctuations in power grid, the operational process of power transformer often exists harmonic input which has a significant impact on its operational vibration and noise. The changes in vibration and noise will have an impact on surrounding environment and the service life of power transformers. In order to simulate the presence of harmonics in the power grid, harmonic excitation needs to be superimposed on the power frequency sinusoidal excitation. This paper improves the magnetic characteristic measurement device, and carries out the measurement of the magnetization and magnetostrictive characteristics of the silicon steel sheet core under different harmonics to explore the magnetic characteristics, electromagnetic vibration and sound field distribution of power transformers under harmonic excitation. Based on the measurement data, the electromagnetic vibration of the power transformer is analyzed and calculated; The magnetic, mechanical, and sound field of the power transformer under harmonic excitation are calculated, and the vibration results are obtained considering the magnetostrictive effect of the core. The calculation results are compared and analyzed with normal condition to summarize the impact of harmonic input on the electromagnetic vibration of the core; Active noise reduction analysis method is used to study the sound field distribution and frequency characteristics around the transformer to prove the feasibility of active noise reduction.
钟思翀, 祝丽花, 王前超, 张建功, 王延召. 电力变压器振动噪声分析及其有源降噪[J]. 电工技术学报, 2022, 37(zk1): 11-21.
Zhong Sichong, Zhu Lihua, Wang Qianchao, Zhang Jiangong, Wang Yanzhao. Electromagnetic Vibration of Power Transformer and Active Noise Reduction. Transactions of China Electrotechnical Society, 2022, 37(zk1): 11-21.
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2022, Vol. 37 
