Open AccessArticle
Effect of Altitude on the Audible Noise Level of AC Power lines
by
Wangling He 1, Baoquan Wan 2, Lei Lan 1, Chunming Pei 3, Jiangong Zhang 2, Yuchao Chen 4, Xiaoyue Chen 1,* and Xishan Wen 1
1
School of Electrical Engineering, Wuhan University, Wuhan 430072, China
2
State Key Laboratory of Power Grid Environmental Protection (China Electric Power Research Institute), Wuhan 430072, China
3
Wuhan NARI Group Corporation, Wuhan 430074, China
4
State Grid Corporation of China, Beijing 100031, China
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Abstract
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
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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.
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