摘要
为了获取高压电缆缓冲层缺陷的位置信息,本文首先根据缓冲层表面形貌特征将缓冲层状态划分为干燥态、受潮态、腐蚀态以及腐蚀烧蚀态,通过薄片样本研究了缓冲层从干燥态到腐蚀烧蚀态这一缺陷发展过程中体积电阻率和相对介电常数的变化规律。然后推导了高压电缆传输线网络中的分布电容以及分布电导的计算公式,评估了FDR法应用于高压电缆缓冲层缺陷定位的可行性。最后在实验室中搭建了长电缆实验平台,研究了频域反射法定位缓冲层缺陷的有效性。结果表明:缓冲层缺陷的发展主要影响高压电缆的分布电容,产生阻抗不连续点。FDR能够实现对缓冲层受潮及缺陷的定位,但对于腐蚀缺陷及烧蚀缺陷的进一步区分还需结合其他状态检测手段。
In order to obtain the location information of defects in buffer layer of HV cable,at first,according to the surface morphological characteristics of buffer layer,the buffer layer states were devided into dry state,damp state,corroded state,and corroded-ablative state,and the change law of volume resistivity and relative dielectric constant during the development of defects from dry state to corroded-ablative state of buffer layer was studied via thin slice samples.Then the computing formula of the distributed capacitance and distributed conductance in the network of HV cables transmission line was derived.The feasibility of applying the FDR method to locate defects in the buffer layer of HV cables was also evaluated.Finally,a long cable experimental platform was built in the laboratory to study the effectiveness of the FDR method in locating buffer layer defects.The results show that the development of buffer layer defect mainly affects the distributed capacitance,and impedance discontinuity points generate in the process.FDR can locate the moisture and defects of the buffer layer,but the further distinction between corrosion defects and ablation defects needs to be combined with other state detection methods.
作者
黄友聪
郑钟楠
林梓圻
张莹
赵琦
袁豪
周凯
HUANG Youcong;ZHENG Zhongnan;LIN Ziqi;ZHANG Ying;ZHAO Qi;YUAN Hao;ZHOU Kai(Electric Power Research Institute of State Grid Fujian Electric Power Company,Fuzhou 350000,China;College of Electrical Engineering,Sichuan University,Chengdu 610065,China)
出处
《绝缘材料》
CAS
北大核心
2024年第6期86-95,共10页
Insulating Materials
基金
国家自然科学基金资助项目(52277156)
国网福建省电力有限公司科技项目(DKFW2022GJT080009)。
