Interaction of Surface Gradient, Precipitation Rate and Conductor Surface Treatment on Corona Induced Audible Noise of AC Overhead Transmission Lines

Research output: Chapter in Book/Report/Conference proceedingConference paperpeer-review


Overhead Transmission lines are prone to emit audible noises under foul weather conditions (e.g. rain or fog), which can be a significant source of annoyance for people living close to the line. Apart from mere fulfilment of emission limits given by legislature, transmission system operators nowadays often seek to reduce audible noise emissions as far as possible to minimize public opposition towards overhead lines. A very promising approach for the reduction of audible noise emissions are hydrophilic conductor surface treatments, which influence the way water drops form on the conductors. However, very little is known about the operating behavior and limitations of hydrophilic conductors. This contribution therefore strives to illustrate how the electric field intensity around the conductors (surface gradient) and the precipitation rate affect the effectiveness and the emission behavior of hydrophilic conductors compared to standard conductors. The presented results are derived from a newly developed prediction model, which is based on noise emission measurements performed on 25 different bundle conductor arrangements carried out in an acoustically optimized high voltage laboratory. The compiled results indicate that hydrophilic surfaces can provide significant noise reductions, which tend to diminish with increasing surface gradient. Above a certain point of intersection, hydrophilic conductors exhibit higher emission levels than standard conductors. Since this behavior has been observed to depend strongly on the bundle conductor geometry, results for various numbers of sub-conductors and sub-conductor diameters are presented. From a practical point of view, this contribution shall raise awareness regarding the optimal utilization of hydrophilic conductors by illustrating the principal correlations and by providing first guidelines.

Original languageEnglish
Title of host publication7th IEEE International Conference on High Voltage Engineering and Application, ICHVE 2020 - Proceedings
Subtitle of host publicationICHVE 2020 - Proceedings 6 September 2020
PublisherInstitute of Electrical and Electronics Engineers
ISBN (Electronic)9781728155111
Publication statusPublished - 6 Sept 2020
Event2020 IEEE International Conference on High Voltage Engineering and
Application: ICHVE 2020
- Virtual, Beijing, China
Duration: 6 Sept 202010 Sept 2020

Publication series

Name7th IEEE International Conference on High Voltage Engineering and Application, ICHVE 2020 - Proceedings


Conference2020 IEEE International Conference on High Voltage Engineering and
Abbreviated titleICHVE 2020
CityVirtual, Beijing


  • Audible Noise
  • Conductors
  • Corona
  • Hydrophilic
  • Overhead Line
  • Surface Gradient

ASJC Scopus subject areas

  • Mechanics of Materials
  • Electronic, Optical and Magnetic Materials
  • Safety, Risk, Reliability and Quality
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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