充油电缆终端局部放电超声波检测方法及频率特征  

Partial Discharge Ultrasonic Detection Method and Frequency Characteristics at Oil-filled Cable Terminal

作　　者：杜亮 郭威 翁慧颖 金雅婷 吴昊 张伟超[2] DU Liang;GUO Wei;WENG Huiying;JIN Yating;WU Hao;ZHANG Weichao(State Grid Zhejiang Electric Power Material Branch Co.,Ltd.,Hangzhou 310000,China;School of Electrical and Electronical Engineering,Harbin University of Science and Technology,Harbin 150080,China)

机构地区：[1]国网浙江省电力有限公司物资分公司,杭州310000 [2]哈尔滨理工大学电气与电子工程学院,哈尔滨150080

出　　处：《浙江电力》2022年第5期75-81,共7页Zhejiang Electric Power

基　　金：国网浙江省电力有限公司科技项目(5211WF200005)。

摘　　要：为了有效地检测充油电缆终端的潜伏性绝缘故障,采用声场有限元分析方法研究充油电缆终端局部放电声场分布特点,提出采用光纤F-P(法布里-珀罗)传感器检测终端液-固复合绝缘局部放电的方法。该方法采用典型电极模型模拟液-固复合绝缘局部放电故障,利用不同固有频率的F-P传感器和压电陶瓷传感器共同探测局部放电声信号,分析液-固复合介质局部放电声发射的频率分布特征。研究结果表明:充油电缆终端内绝缘局部放电声波可沿高模量固体传播且形成有利于光纤F-P传感器检测的强声场区;典型液-固绝缘局部放电超声波频率在40~180 kHz范围较丰富。明确充油电缆终端局部放电声场分布范围和频率特征,可有效提高局部放电检测灵敏度,提高局部放电检出成功率。In order to effectively detect latent insulation faults at oil-filled cable terminals,the finite element analysis method of acoustic field is used to study the characteristics of partial discharge acoustic field distribution at oil-filled cable terminals,and the method of using fiber optic F-P(Fabry-Perot)sensors to detect partial discharge of terminal liquid-solid composite insulation is proposed.The method uses a typical electrode model to simulate the partial discharge fault of liquid-solid composite insulation,employs F-P sensors with different intrinsic frequencies and piezoelectric ceramic sensors to jointly detect the partial discharge acoustic signal,and analyzes the frequency distribution characteristics of the partial discharge acoustic emission of liquid-solid composite medium.The results show that:the partial discharge acoustic wave of the insulation inside the oil-filled cable terminal can propagate along the high modulus solid and form a strong acoustic field area which is favorable to the detection of the fiber optic F-P sensor;the typical liquid-solid insulation partial discharge ultrasonic wave frequency is rich in the range of 40~180 kHz.Clarifying the distribution range and frequency characteristics of partial discharge sound field in oil-filled cable terminals can effectively improve the sensitivity of partial discharge detection and increase the success rate of partial discharge detection.

关 键 词：局部放电检测 声检测方法 局部放电声频率 电缆终端 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置] TM855[自动化与计算机技术—控制科学与工程]