In this paper, a study is made on the distribution of noise spectrum characteristics of a 500 kV transformer operating at 80% and 100% of the rated current and 80% and 100% of the rated voltage. To improve the ability of identifying transformer noise in different factory conditions, the short-time strong correlation of line spectrum of transformer vibration noise is used to obtain high-quality reconstruction signal, the line spectrum SNR over detection threshold is extracted through CFAR processing, and 100 Hz and frequency doubling are identified. The test results show that the reconstruction signal is improved by 3–5 dB compared with the detected SNR of original line spectrum, and more vibration line spectrum can be extracted, thus providing more information about the line spectrum for diagnosis, monitoring and identification of transformer factory noise fault.
Substation plant boundary noise is an important environmental index of power grid engineering. In order to improve the sound environment quality around the substation, it is necessary to analyse the transformer near field noise and plant boundary noise loudness. In this paper, the field noise test of a 110kV outdoor substation is carried out. The measured data of transformer near-field noise and factory boundary noise are obtained. The loudness of a typical area is analyzed. The analysis of transformer noise loudness can provide accurate field data for substation noise control.
Power transformer is the main noise source of substation. In order to reduce the noise of transformer, this paper presents a double layer sound insulation wall structure of transformer tank. The sound insulation performance test of the sample based on the double wall panel structure is completed. Through the measured data and numerical simulation, the results show that the double-layer sound insulation panel has better sound insulation effect. When the air inside the sandwich space is pumped, the sound insulation volume is not significantly improved due to the deformation factor. The feasibility of this method is verified by experiments, which provides technical reference and experimental basis for noise control of oil-immersed transformer.
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