高压输电杆塔接地极腐蚀缺陷混频SH导波检测方法  

Mix-Frequency SH Guided Wave Corrosion Defects Detection Method for High Voltage Transmission Tower Grounding Electrode

作　　者：彭丽莎 孙洪宇 李世松[1] 王珅[1] 黄松岭[1,3] Peng Lisha;Sun Hongyu;Li Shisong;Wang Shen;Huang Songling(Department of Electrical Engineering Tsinghua University,Beijing 100084,China;School of Physical Science and Engineering Beijing Jiaotong University,Beijing 10044,China;State Key Laboratory of Power System Operation and Control,Beijing 100084,China)

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]北京交通大学物理科学与工程学院,北京100044 [3]新型电力系统运行与控制全国重点实验室,北京100084

出　　处：《电工技术学报》2025年第2期376-386,共11页Transactions of China Electrotechnical Society

基　　金：北京市自然科学基金(3232047);中国科协青年人才托举工程(2022QNRC001);国家自然科学基金(U23B20113)资助项目。

摘　　要：高压输电杆塔接地极作为雷电流、工频故障电流和感应电流等异常电流的关键传导通道,对于保障电力线路的安全稳定运行具有重要作用。然而,接地极腐蚀缺陷的存在将严重影响其正常的散流功能,威胁电力系统安全稳定运行,甚至人身安全。针对高压输电杆塔接地极腐蚀缺陷的远距离、小缺陷高灵敏度检测难题,该文提出一种高压输电杆塔接地极腐蚀缺陷混频SH导波检测方法。设计了一种基于变间距永磁阵列的新型混频SH导波换能器结构,并通过仿真和实验验证了混频SH导波检测的可行性。进一步将所提方法与传统的单频SH导波检测方法进行比对,结果表明所提出的SH导波检测方法相比于传统方法对远距离、小缺陷具有更高的灵敏度检测和更好的检测效果。High-voltage transmission towers play a crucial role in the electrical power system as power transmission hubs.The transmission towers support long-distance transmission lines and serve as essential pathways for conducting abnormal currents,along with grounding devices.These towers are vital for ensuring power lines’safe and stable operation.However,the grounding electrodes of transmission towers are prone to corrosion and fracture due to imbalanced soil acidity,microbiological corrosion,and other environmental factors,which threaten the power system's safe operation.Therefore,research on detection methods for corrosion defects in the grounding electrodes of high-voltage transmission towers is necessary.However,since the grounding electrode devices of high-voltage transmission towers are typically buried underground,direct observation of the overall state of corrosion damage is not feasible.Excavation-based detection methods are labor-intensive and have low efficiency.Consequently,non-excavation-based fault diagnosis methods for grounding electrodes are essential.Ultrasonic-guided wave testing is a non-destructive method employing single-ended excitation and reception for long-distance detection and diagnosis,which is suitable for detecting corrosion defects in metal specimens like grounding electrodes that are buried underground.This method enables quick detection and localization of defects over a considerable distance.It eliminates the need for complete excavation of the grounding device,is almost immune to external electromagnetic signal interference,and can accurately identify and even quantify corrosion defects in the grounding electrode.However,electromagnetic ultrasonic-guided waves at a single frequency have limitations in detecting corrosion defects in grounding electrodes.Low-frequency guided waves propagate over long distances with minimal attenuation but lack sensitivity in detecting microdefects.On the other hand,high-frequency guided waves exhibit high sensitivity to microdefects but suffer from

关 键 词：高压输电杆塔 接地极 电磁超声导波 混频SH导波 缺陷检测 

分 类 号：TM862[电气工程—高电压与绝缘技术]