油中局部放电超声直达波与混叠波的建模研究  

Modeling Research on Direct and Superimposed Ultrasonic Wave of Partial Discharge in Oil

作　　者：谢庆[1] 程述一[1] 李菱[2] 李燕青[1] 律方成[1] 

机构地区：[1]河北省输变电设备安全防御重点实验室(华北电力大学),河北省保定市071003 [2]广西电网公司河池供电局,广西壮族自治区河池市547000

出　　处：《中国电机工程学报》2013年第28期185-192,27,共8页Proceedings of the CSEE

基　　金：国家863高技术基金项目(2011AA05A121);河北省自然科学基金(E2010001703)~~

摘　　要：有效识别超声直达波与混叠波信号是电气设备油中局放定位成功与否的关键。首先采用电–力–声类比原理建立局放超声信号的数学模型;接着对油中局放超声波传播时的折反射问题、衰减规律以及传播路径进行了理论分析,并对超声传感器接收到直达波与混叠波信号的时域波形进行建模;然后搭建实验平台,采集超声直达波与混叠波的实验波形,与仿真波形进行对比,多次实验结果表明,直达波与混叠波仿真波形与实验波形的相似度均为85%以上;最后采用相似度为85%的直达波实验波形与仿真波形进行局放定位,结果显示:采用实验波形进行定位,误差为8.3 cm,采用仿真波形进行定位,误差为5.2 cm,两者之间的定位误差相差较小,从而验证了该建模方法的正确性。The effective identification of partial discharge （PD） ultrasonic direct wave and superimposed wave in oil is the key to positioning the PD source in the electrical equipment. In this paper, the modeling method on direct and superimposed ultrasonic wave of PD in oil was studied. First, the mathematical model of the PD ultrosonic signal was built using the electrical-force-sound principle; Second, the reflection and refraction law, the attenuation law and the propagation path of the PD ultrosonic signal in oil was studied, and the PD ultrosonic direct wave and superimposed wave were modeled after that; Third, the acutal waneforms of direct wave and superimposed wave were collected using the established experimental platform. Comparing with the simulating waveforms, the results of some experiments show that the similarity of the direct and superimposed waveforms between the actual and simulating waves are more than 85%. Finally, the PD source was located using the actual wave and the simulating wave of the direct wave whose similarity is 85%, the result shows that the error is 8.3cm using the experimental waves, while the error is 5.2cm using the simulating waves, the error between them is small, wnich proves the correctness of the modeling method proposed in this paper.

关 键 词：局部放电 超声直达波 超声混叠波 传播理论 相似度 

分 类 号：TM85[电气工程—高电压与绝缘技术]