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access icon free 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

  • Author(s): Yingyi Liu 1 ; Yuanqing Liu 2 ; Haiwen Yuan 1 ; Liang Ji 3
    • View affiliations
  • Source: Volume 12, Issue 11, 19 June 2018, p. 2549 – 2556
    DOI:  10.1049/iet-gtd.2017.0467 , Print ISSN 1751-8687, Online ISSN 1751-8695
© The Institution of Engineering and Technology
Received 23/03/2017, Accepted 30/01/2018, Revised 04/01/2018, Published 01/02/2018

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.

Inspec keywords: electric current measurement; corona; power transmission lines; frequency-domain analysis; DC transmission networks; correlation methods

Other keywords: corona current measurement; statistical analysis; ultrahigh-voltage DC corona cage; UHV DC corona cage; spectrum characteristics; A-weighted sound level; mathematical correlation formula; frequency-domain characteristics; UHV DC transmission line; audible noise estimation

Subjects: Gas discharges; Mathematical analysis; Current measurement; d.c. transmission

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