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正极性两点电晕放电可听噪声关联性实验研究

DOI: 10.13334/j.0258-8013.pcsee.2015.11.030, PP. 2896-2902

Keywords: 正极电晕放电,两点电晕,可听噪声,电晕电流,时域测量,声压级

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Abstract:

为研究两点电晕放电产生的可听噪声的特性,该文在10m法电波暗室内搭建了正极性两点电晕放电测试平台,准确测量了两个放电点相距12mm、10cm、20cm、40cm、60cm及80cm时正极性电晕放电产生的可听噪声与电晕电流的时域波形。借助于电晕电流与可听噪声脉冲的一一对应关系,提出从时域分离两点电晕放电时各放电点产生的可听噪声时域波形方法,借助于分离出的可听噪声时域波形对两点电晕放电产生可听噪声的关联特性进行了分析。实验结果表明:两点电晕放电产生的可听噪声脉冲与电晕电流脉冲依然具有一一对应关系。在时域上两点电晕放电产生的声压为各放电点产生的声压的线性叠加,在计算两点电晕放电产生的总声压级特性时,可以按照声功率叠加的方法来计算。实际输电线路上放电点的间距一般较大,各放电点可以看成不相关的声源,放电产生的声压及声功率均可采用线性叠加的方法来计算。在分析放电点间距对可听噪声的特性的影响时,需要综合考虑放电点之间的相互影响及放电点产生的声波衰减的影响。

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