Abstract
A reasonable acoustic power formula is vital to precisely evaluate the audible noise (AN) level of ultra-high-voltage (UHV) AC power lines. This study derived a formula by taking several AN measurements under heavy rain conditions, using multiple conductor bundles in a UHV corona cage, and then subjecting these measured values to least squares fitting. The validity of the proposed formula was subsequently verified with statistical data obtained from two long-term stations at Henan and Hubei Province, which are located under the Jindongnan-Nanyang-Jingmen UHV AC transmission lines operating at 1000 kV. The deviation between the prediction and the long-term (L50) value was 0.76 dB for the Henan station and 0.17 dB for the Hubei station. It shows that the acoustic power formula derived in this paper is more accurate than the widely used Bonneville Power Administration formula, in which the corresponding deviations are much larger (3.07 and 2.53 dB).
Highlights
Ultra-high-voltage (UHV) AC transmission lines are indispensable to the development of electric power transmission in China [1]
To obtain a more accurate description of the audible noise (AN) level caused by transmission lines, AN cage measurements were taken for a high number of conductor bundles; these were summarized, and used to derive a relevant AN formula
The AN performances of 17 bundle conductors has been investigated by using a corona cage under heavy rain conditions
Summary
Ultra-high-voltage (UHV) AC transmission lines are indispensable to the development of electric power transmission in China [1]. Between 1967 and 1971, many tests were performed by the the American Electric Power Company to evaluate the corona effects of high-voltage lines, including. In 2010, Tang formula to predict the L50 value of AN level for transmission line in the last decades. To obtain a more accurate description of the AN level caused by transmission lines, AN cage measurements were taken for a high number of conductor at 1000 kV [24,25]. To obtain a more accurate description of the AN level caused by transmission lines, AN cage measurements were taken for a high number of conductor bundles; these were summarized, and used to derive a relevant AN formula. The predicted values calculated by this function were compared with the long-term data, and the results showed a good match
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