导线表面污秽对正极性单电晕点可听噪声频谱特性的影响  

Influence of Conductor Surface's Contamination on Spectrum Characteristics of Audible Noise from Single Corona Point Under Positive DC Voltage

作　　者：怡勇[1,2] 张楚岩[2] 王元九 王黎明[2] 

机构地区：[1]清华大学电机工程与应用电子技术系,北京100084 [2]清华大学深圳研究生院,深圳518055

出　　处：《高电压技术》2016年第6期1990-1996,共7页High Voltage Engineering

基　　金：国家重点基础研究发展计划(973计划)(2011CB209406);国家自然科学基金(51377096)~~

摘　　要：为了深入研究在正极性电压下导线表面污秽对可听噪声频谱特性的影响,在实验室搭建了基于电晕笼的单电晕点可听噪声测量实验平台。分别测量了单电晕点表面附着氯化钠、高岭土、碳粉等不同种污秽下的可听噪声频谱特性,并且对不同表面状态下单电晕点在不同电压下的可听噪声频谱进行了长期的统计。结果表明:随电压增加,干净单电晕点的可听噪声不同频率分量的变化有较大差异。相对于干净导线,污秽对单电晕点噪声频率<1 k Hz分量的影响较小,对噪声频率>1 k Hz分量影响较大。对噪声高频分量的影响主要由于电子及离子在高场强下,运动速度较快,所含的能量较大,从而引起其周围空气强烈震动,产生高频噪声。In order to investigate the influence of conductor surface＇s contamination on the spectrum of the audible noise under positive DC voltage, an experiment platform was constructed to measure the audible noise of the single corona point in the laboratory. When the surface of the conductor was covered with salt, kaolin, and carbon, respectively, the spectra of the single corona point were measured and recorded under different positive DC voltage. The long-term spectrum measurements of different surface conditions were made under different voltage. The results reveal that the spectral components of the audible noise are obviously different with the increase of voltage applied on the clean conductor. The spectral components（1 k Hz） of the polluted conductor are much higher than those of the clean conductor. The contamination adhering to the surface of conductor affects spectral components（1 k Hz） much more obviously than low spectral components（1 k Hz）. Since the speed of electrons and ions is fast in the strong electric field, and collision between neutral and charged particles can generate a momentum source, the momentum source can cause the perturbation of the air and produce acoustic source.

关 键 词：正极性电晕放电 可听噪声 频谱特性 单电晕点 电晕笼 人工污秽 

分 类 号：TM75[电气工程—电力系统及自动化]