正极性两点电晕放电可听噪声关联性实验研究  

Experimental Study on the Correlation of Audible Noise From a Pair of Positive Corona Sources on the Conductor

作　　者：李学宝 崔翔 卢铁兵 王振国 王东来 刘阳 陆家榆[2] 赵明敏[2] 

机构地区：[1]新能源电力系统国家重点实验室(华北电力大学),北京市昌平区102206 [2]中国电力科学研究院,北京市海淀区100192

出　　处：《中国电机工程学报》2015年第11期2896-2902,共7页Proceedings of the CSEE

基　　金：国家重点基础研究发展计划(973计划)(2011CB209402)~~

摘　　要：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12 mm、10 cm、20 cm、40 cm、60 cm及80 cm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。In order to investigate the characteristics of the audible noise from a pair of positive corona sources on the conductor, a platform with two corona sources was set up in the 10 m anechoic chamber. The time-domain waveforms of audible noise and corona current were accurately measured. In the experiments, the distances of the two corona sources were set as 12 mm, 10 cm, 20 cm, 40 cm, 60 cm and 80 cm respectively. A method for separating the sound pressure pulses from two corona sources was developed with the help of the one-to-one relationship between the audible noise and the corona current. Based on the separated audible noise waveform, the correlation of audible noise from two corona source was presented. The results show that the audible noise pulse and the corona current pulse for two corona Sources still have one-to-one relationship in time-domain. The sound pressure generated by the two corona sources can be treated as the superposition of the sound pressure generated by each source. The distance of the corona sources for the practical transmission lines is generally large enough, and thus the corona sources can be treated as uncorrelated sound sources. This paper gives a confirmation that the analysis of the sound pressure level from two corona sources can be carried out in terms of acoustics power on the basis of the results. Besides, the interactions from corona sources and the attenuation of the audible noise should be taken into consideration in the analysis of the influence of the separations between corona sources on the total sound pressure level.

关 键 词：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 

分 类 号：TM85[电气工程—高电压与绝缘技术]