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Research on the correlation between the frequency-domain characteristics of corona current and A-weighted sound level of audible noise for UHV DC transmission line

Research on the correlation between the frequency-domain characteristics of corona current and A-weighted sound level of audible noise for UHV DC transmission line

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Audible noise is closely related to the frequency-domain characteristics of corona current. Based on the largest ultra-high-voltage (UHV) DC corona cage in the world and an actual UHV DC transmission line, a large amount of audible noise and corona current were measured simultaneously here. According to the statistical analysis of the experimental data, the correlation relationship between the frequency-domain characteristics of corona current and audible noise was obtained, and the causes of correlation rule were also analysed. Meanwhile, the correlation formula between the spectrum characteristics of corona current and A-weighted sound level of audible noise was discovered. The experimental results showed that the mathematical correlation formula discovered has good universality. The obtained results can provide theory and experimental foundation for deeply research on the essential connection between corona current and audible noise, which makes it possible to explore the causes of audible noise's change law from the perspective of ‘sound source’ and may provide a new method for audible noise estimation.

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