Analysis of Vibration Characteristics and Noise Reduction for 10kV Oil-Immersed Transformer

Distribution transformers are usually located near residential buildings, which cause serious noise pollution. This paper focuses on reducing the vibration noise of 10kV oil-immersed transformer by optimization of transformer case structure. Based on the analysis of the vibration characteristics for the transformer case surface, the noise reduction measures were put forward for the 10kV oil-immersed transformer. An optimization method combining finite element and genetic algorithm was proposed, and the surface vibration velocity was reduced by optimizing the size of the heat sink. At the same time, a noise reduction strategy based on modal vibration amplitude optimization was proposed by increasing additional mass blocks. The structure of oil-immersed transformer was designed rationally according to the proposed optimization measures. The measurement result showed that the average A-weighted sound pressure level of the optimized transformer was reduced by 8.41dB(A).