液-固复合介质对光纤法-珀局部放电超声响应强度影响分析  

Impact of Liquid-Solid Composite Medium on Fiber Fabry-Perot Response Induced by Ultrasound from Partial Discharge

作　　者：张伟超[1,2] 董青青 赵洪 张立永[2] Zhang Weichao;Dong Qingqing;Zhao Hong;Zhang liyong(Key Laboratory of Engineering Dielectrics and Its Application Ministry of Education School of Electrical and Electronic Engineering Harbin University of Science and Technology Harbin 150080 China;FuTong Group Co. Ltd Hangzhou 311400 China)

机构地区：[1]哈尔滨理工大学电气与电子工程学院工程电介质及其应用技术教育部重点实验室黑龙江省电介质工程重点实验室,哈尔滨150080 [2]富通集团有限公司研究院,杭州311400

出　　处：《电工技术学报》2019年第10期2230-2238,共9页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金青年基金(51607049);黑龙江省普通本科高等学校青年创新人才培养计划(UNPYSCT-2016160);黑龙江省普通高校基本科研业务费专项资金(LGYC2018JC029)资助

摘　　要：非本征光纤法-珀(F-P)传感器置于电力设备内液体绝缘检测局放声信号面临灵敏度低的问题。由于不同介质结构的声压分布影响灵敏度,采用声场有限元方法分析声波机械能在液-固复合介质中的暂态传递过程,对比超声波经液-固-液介质与单一液体介质传播后的声压大小,并分析固体物性参数对声压的影响,提出利用复合介质结构增强声压提高局放检测灵敏度的方法。分别采用PZT和板-板电极为连续超声源和局放声波源,对比F-P传感器在液体介质和液-固-液介质中的响应幅值。结果表明,液-固-液声耦合结构对声压有增强作用,且增强大小与传感器和固体介质的距离、固体介质物性参数相关;F-P传感器在液-固-液耦合结构中的局放响应幅值约是纯液体中的2倍。The extrinsic fiber Fabry-Perot (F-P) sensor placed in the liquid insulation of power equipment for partial discharge (PD) acoustics detection faces the problem of lower sensitivity. Due to the influence of the sound pressure distribution in different media on the sensitivity, the transient processes were simulated and analyzed by the finite element method in the sound field when the acoustic energy transferred through the liquid-solid media. The value of sound pressure in liquid-solid-liquid medium was compared with that in liquid medium, and the influence of physical parameters of solid material on sound pressure value was analyzed. Then, a method for enhancing the sound pressure by using a composite medium structure is proposed to improve the F-P sensitivity of PD detection. PZT and plate-plate electrodes were used as continuous ultrasonic and PD acoustic source respectively, and the response amplitudes of F-P sensor were compared in liquid and liquid-solid-liquid media. The results show that the acoustic coupling structure of liquid-solid-liquid material can enhance the sound pressure. The magnitude of enhancement is related to two factors: the distance between F-P sensor and the solid medium;the physical parameters of solid material. The amplitude of the F-P sensor for PD measurement in liquid-solid-liquid medium is about twice that in pure liquid medium.

关 键 词：局部放电 非本征法-珀传感器 有限元分析 超声传播 

分 类 号：TM855[电气工程—高电压与绝缘技术]