海拔对导线交流电晕可听噪声影响的电晕笼试验结果与分析

Test Results and Analysis of Altitude-change Effect on Audible Noise of AC Corona Occurring on Conductors With Corona-test Cage

我国高压输电线路面临着高海拔特殊问题,利用可移动式电晕笼系统在4个不同海拔对3种导线进行了交流电晕可听噪声试验研究,得出了可听噪声海拔修正的初步结果。试验结果表明,如果按线性关系修正,得到的海拔修正系数为3.2dB/1000m,与国外3.33dB/1000m的修正系数非常吻合。然而,研究表明,海拔对导线交流可听噪声的影响不是线性的,由海拔较高地区试验数据对比得到的可听噪声海拔修正系数要小于由海拔较低地区对比得到的海拔修正系数;通过分析测试结果得出了粗略的海拔修正系数与海拔的关系。最后,推荐了一种高海拔输电线路可听噪声海拔修正方法,适用范围扩展至海拔3000m以上地区,供今后我国高海拔实际工程参考。

High voltage power transmission faces the problem of high altitude in China. In this paper, a mobile corona test cage is firstly applied to measure the AC corona audible noises of three types of transmission bundle lines in four areas with different altitudes. The effect on audible noise from altitudes was analyzed in details. Based on linear correction relation, a correction coefficient of 3.2 dB/1 000 m was obtained which is in good agreement with the foreign coefficient 3.33 dB/1 000 m suggested by foreign colleagues. However, the test results show that AC corona audible noise of conductor does not vary with altitude in linear relation. The higher the altitude is, the smaller the altitude correction value especially in areas with altitude above 3 000 m is. Therefore, a nonlinear correction is presented based on the test data. Finally, the research results can be applicable to the case of altitude above 3 000 m and it provides insights on high altitude power engineering in China.