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 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.
Highlights
With the imbalance in the distribution of energy resources and load centers in China, an increasing number of high-voltage transmission lines are being built to transport power from western regions to eastern regions
From [9], it can be observed that, in many cases, the selection of conductors for Bonneville Power Administration (BPA, USA) high-voltage lines is based on audible noise (AN) performance
The A-weighted acoustic power density was used as the generation quantity of AN to describe the AN performance of transmission lines [14]
Summary
With the imbalance in the distribution of energy resources and load centers in China, an increasing number of high-voltage transmission lines are being built to transport power from western regions to eastern regions. Because the region encompassing western and eastern China covers a vast area with a wide-ranging altitude, some high-voltage AC (HVAC) transmission lines are inevitably built in high-altitude areas such as the Qinghai-Tibet plateau, which covers approximately 200,000 km and has an average altitude exceeding 3200 m [1,2,3]. From [9], it can be observed that, in many cases, the selection of conductors for Bonneville Power Administration (BPA, USA) high-voltage lines is based on AN performance. Investigating the influence of altitude on AN levels is critical
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
