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Energies 2017, 10(7), 1055; doi:10.3390/en10071055

Effect of Altitude on the Audible Noise Level of AC Power lines

School of Electrical Engineering, Wuhan University, Wuhan 430072, China
State Key Laboratory of Power Grid Environmental Protection (China Electric Power Research Institute), Wuhan 430072, China
Wuhan NARI Group Corporation, Wuhan 430074, China
State Grid Corporation of China, Beijing 100031, China
Author to whom correspondence should be addressed.
Received: 15 June 2017 / Revised: 3 July 2017 / Accepted: 18 July 2017 / Published: 21 July 2017
(This article belongs to the Section Electrical Power and Energy System)
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The audible noise (AN) induced by corona discharge of AC transmission lines is more severe at high altitudes than at low altitudes; this has become a crucial limiting factor for the structural design of power lines and their environmental impact assessment. To determine the altitude effect and correction of AN level for AC power lines, a corona cage test system was used to measure the acoustic power level of four bundled conductors at five elevations, namely Wuhan (23 m), Tianshui (1100 m), Xining (2261 m), Gonghe (2943 m), and Yangbajain (4300 m). We obtained the AN characteristics for different altitudes, bundle numbers, and subconductor diameters through a statistical analysis of measured data. The analysis and comparison results indicate that the actual AN correction values are slightly less than the Bonneville Power Administration term of 1 dB/300 m at altitudes below 3200 m. Above 3200 m, the difference increases gradually. A correction term 2.85 dB/1000 m is recommended for more accurate evaluation. View Full-Text
Keywords: ultra-high voltage AC power lines; corona performance; audible noise; high altitude correction ultra-high voltage AC power lines; corona performance; audible noise; high altitude correction

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

He, W.; Wan, B.; Lan, L.; Pei, C.; Zhang, J.; Chen, Y.; Chen, X.; Wen, X. Effect of Altitude on the Audible Noise Level of AC Power lines. Energies 2017, 10, 1055.

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