特高压电晕笼内正负极性导线的可听噪声频谱特性规律研究

Audible Noise Spectrum Characteristics of Positive and Negative Wire in UHV Corona Cage

为深入研究特高压直流线路正负极导线的电晕放电机制和电晕可听噪声特性规律,基于国家电网公司特高压直流试验基地的电晕笼,对6?720 mm2导线的可听噪声频谱进行了测试和分析。利用电晕笼中间网的可拆卸功能,对电晕笼内正极、负极、正负双极导线的可听噪声进行测试,分别得出了不同电压下正极噪声、负极噪声、临近正负极导线位置的噪声频谱特性规律,并进行了对比和分析。还分析了考虑背景噪声时,在不同导线表面电场强度下电晕可听噪声A声级与其8 kHz分量的稳定性。利用曾提出的8 kHz分量法来对正极噪声、负极噪声、临近正负极导线的双极噪声在不同导线表面电场强度下的噪声特性进行了分析,得出了8 kHz分量法可适用于正极噪声和双极噪声的结论。

For further study of the discharge mechanism and audible noise＇s characteristics of positive, negative and bipolar UHVDC test line, the audible noise＇s spectrum for 6×720 mm2 wires were tested and analyzed based on the corona cage in the UHV-DC test base of State Grid Corporation of China. Using the mid-net detachable corona cage, the audible noise of positive, negative and bipolar lines in corona cage were tested, and the noise＇s spectral characteristics of positive, negative line and that near the bipolar pole, and their relationship with voltage were reached, and the comparative analysis of their results were ＇conducted. The paper also analyzed the stability of corona audible noise＇s A weighed sound level and its 8 kHz components in different surface field strength when the background noise was also considered. Finally, the 8 kHz component method which was proposed before being used to analyze the noise＇s characteristics of positive, negative pole and the noise near dipole line in different surface field strength, and the 8 kHz component can be used to calculate the noises of positive and dipole line.