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Study on the Functional Coating for Ampacity-Uprated DC Overhead Line Part I The Influence Mechanism of the Droplet Deformation on the Corona Audible Noise

Lookup NU author(s): Professor Vladimir TerzijaORCiD

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Abstract

© 1986-2012 IEEE.Corona audible noise (AN) generated by DC high voltage fittings and overhead lines (OHLs) reaches peak intensity after rainfall, before surface droplets completely evaporate, and constitutes a major source of environmental noise in DC transmission systems and substations. To clarify the role of electrically induced droplet deformation in corona noise level, this study combines 2D-axisymmetric simulations with experimental measurements to investigate droplet dynamics, corona discharge behaviour, and associated acoustic emissions under DC voltage. A shadowgraph imaging system and multiphysics simulations were employed to characterize droplet deformation. Results demonstrate that droplets undergo periodic deformation in the time domain under DC electric fields. The deformation rate initially increased and subsequently decreased with increasing surface static contact angle (SCA). Relative to dry electrodes, droplets increased the mean corona current while reducing the average discharge interval. Moreover, higher deformation rates resulted in greater corona current, longer discharge intervals, and elevated sound pressure levels, including A-weighted levels. Integrated simulation and experimental analyses further revealed that corona audible noise is governed primarily by the proportion of droplet surface area where the electric field exceeds the critical discharge threshold; larger high-field regions produce stronger noise emissions. These findings provide theoretical guidance for surface modification design in DC power equipment and establish a numerical framework for investigating electrically driven droplet dynamics.

Publication metadata

Author(s): Meng W, Li J, Li Q, Kopsidas K, Hu J, Terzija V, Jiang X

Publication type: Article

Publication status: Published

Journal: IEEE Transactions on Power Delivery

Year: 2026

Pages: epub ahead of print

Online publication date: 17/06/2026

Acceptance date: 02/04/2018

ISSN (print): 0885-8977

ISSN (electronic): 1937-4208

Publisher: Institute of Electrical and Electronics Engineers Inc.

URL: https://doi.org/10.1109/TPWRD.2026.3704732

DOI: 10.1109/TPWRD.2026.3704732

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