适用于声源定位的气体绝缘输电线路超声导波传播特性研究  

Research on Propagation Characteristics of Gas-Insulated Transmission Line Ultrasonic Guided Wave for Sound Source Localization

作　　者：杜志叶[1] 郝兆扬 赵鹏飞 王恒 郝乾 Du Zhiye;Hao Zhaoyang;Zhao Pengfei;Wang Heng;Hao Qian(School of Electrical Engineering and Automation Wuhan University,Wuhan 430072,China;Wuhan Landpower Co.Ltd,Wuhan 430205,China)

机构地区：[1]武汉大学电气与自动化学院,武汉430072 [2]武汉朗德电气有限公司,武汉430205

出　　处：《电工技术学报》2024年第3期852-862,共11页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金资助项目(51977152)。

摘　　要：基于到达时间差(TDOA)的声源定位方法是当前气体绝缘输电线路(GIL)故障定位的主要方式,声波在GIL结构上的传输特性深刻影响着定位结果的准确性。为进一步提升故障定位精度,该文提出了考虑导波频散与多模态特性的GIL壳体声传输分析模型,以典型220 kV GIL管段为研究对象,建立声波传输有限元模型,研究了导波特性对故障定位的影响,确定了适用于故障定位的超声导波模态以及GIL非直管结构对该模态导波的衰减与时延量,通过现场定位试验验证了分析模型的可行性,为GIL声源故障定位系统的传感器配置与定位阈值设置提供了计算依据。结果表明,在20~60 kHz频带内,F(1,1)模态导波具有能量高、波形形状稳定、抗干扰能力强等特点,使用该模态导波进行故障定位精度较高。GIL非直管结构会对F(1,1)模态导波造成较大的幅值衰减与一定程度的时延,在故障定位中考虑非直管结构衰减与时延影响可以使定位误差降低60%以上。The sound source localization method based on time difference of arrival(TDOA)is currently the mainstream method for fault location of gas-insulated transmission line(GIL).The GIL shell is similar to the cylindrical shell,and the acoustic wave propagating along the shell has the dispersion and multi-modal characteristics,which increases the difficulty of precise positioning.In recent years,people have studied the acoustic wave transmission process on GIL,but most of the studies have ignored the influence of guided wave characteristics on the transmission of acoustic wave,and the research results are deviated from the actual situation.In order to solve these problems,this paper proposes a GIL shell acoustic transmission analysis model considering guided wave dispersion and multi-modal characteristics,determines the guided wave mode suitable for GIL fault location and the attenuation and time delay caused by GIL non-straight tube structure,which effectively improves the fault location accuracy of GIL.Firstly,the dispersion curve of guided wave in the typical 220 kV GIL shell is drawn,and the guided wave modes in the frequency range of 0~100 kHz are determined.Secondly,a finite element model of acoustic wave transmission in the long-distance GIL straight pipe is established,and the propagation characteristics of guided waves are studied by applying different excitation to the model.According to the simulation results and the requirements of GIL sound source localization,the effective frequency band and guided wave mode suitable for fault location are determined.Thirdly,in order to study the location advantages of the selected guided wave mode in the GIL non-straight pipe section and the attenuation and time delay by the GIL non-straight pipe structure,the expansion joint,gas basin insulator and other non-straight pipe structures are added to the long-distance GIL straight pipe model.Finally,the selected guided wave mode is used for GIL field location test,and the influence of the attenuation and time delay of the GI

关 键 词：气体绝缘输电线路(GIL) 故障定位 到达时间差(TDOA) 超声导波 传播特性 

分 类 号：TM755[电气工程—电力系统及自动化]