基于太赫兹时域光谱的XLPE不同尺度缺陷研究  

Study on different scales of defects in XLPE based on terahertz time-domain spectroscopy

作　　者：廉泽 李新禹 俞华 冯阳 李盛涛[2] LIAN Ze;LI Xinyu;YU Hua;FENG Yang;LI Shengtao(Electric Power Research Institute of State Grid Shanxi Electric Power Corporation,Taiyuan 030001,China;State Key Laboratory of Electrical Insulation and Power Equipment,Xi′an Jiaotong University,Xi′an 710049,China)

机构地区：[1]国网山西省电力公司电力科学研究院,山西太原030001 [2]西安交通大学电力设备电气绝缘国家重点实验室,陕西西安710049

出　　处：《绝缘材料》2024年第4期100-108,共9页Insulating Materials

基　　金：国网山西省电力公司电力科学研究院项目(SGSXDK00SPJS2200142)。

摘　　要：交联聚乙烯(XLPE)在生产、敷设、运行过程中会受到多种因素影响,产生不同尺度的结构缺陷,进而影响XLPE的电气性能。本文对XLPE电力电缆中常见的分子缺陷、聚集态结构缺陷与宏观气隙缺陷进行了重构,并结合X射线衍射测试(XRD)与太赫兹时域光谱(THz-TDS)的透射和反射模块对3种尺度的缺陷进行表征。结果表明:太赫兹时域光谱的电压幅值、相位信息分别表现出关于极性分子与聚集态结构变化的敏感特性;通过太赫兹时域光谱透射与反射模块的联用技术,可精准识别并计算出内部气隙缺陷的位置及尺寸,实现对不同尺度缺陷的无损检测。Cross-linked polyethylene(XLPE)is subject to various environmental or human factors during production,laying,and operation,which can generate structural defects at different scales and affect the electrical performance of XLPE.In this paper,the molecular defects,aggregated structural defects,and macroscopic air gap defects in XLPE power cables were reconstructed and characterized by X-ray Diffraction(XRD)and transmission and reflection modules of terahertz time-domain spectroscopy(THz-TDS).The results show that the amplitude and phase information of terahertz time-domain spectroscopy exhibit sensitive to the structural changes of polar molecules and aggregates,respectively.The location and size of hidden air gap defects can be accurately identified and calculated by the combined technique of transmission and reflection modules of terahertz time-domain spectroscopy,realizing the nondestructive detection of defects at different scales.

关 键 词：交联聚乙烯 太赫兹时域光谱 缺陷 无损检测 

分 类 号：TM215[一般工业技术—材料科学与工程] TM855[电气工程—电工理论与新技术]