110 kV电缆中间接头半导电层缺陷局部放电测试技术研究  

Research on partial discharge testing of semi conducting layer defects in 110kV cable joint

作　　者：项恩新 杨能 王科 徐肖伟 周婉亚 吴琦[2] Xiang Enxin;Yang Neng;Wang Ke;Xu Xiaowei;Zhou Wanya;Wu Qi(Electric Power Research Institute of Yunnan Power Grid Co.,Ltd,Kunming 650000,China;School of Electrical Engineering and Information,Sichuan University,Chengdu 610065,China)

机构地区：[1]云南电网有限责任公司电力科学研究院,昆明650217 [2]四川大学电气信息学院,四川成都610065

出　　处：《云南电力技术》2019年第3期44-47,共4页Yunnan Electric Power

摘　　要：高频电流耦合法(HFCT法)和检测阻抗法是高压电缆局部放电检测重要手段,两种方法局部放电检测装置以及数据分析方法均不相同,致检测数据难以横向比对,给运维和检修带来困难。为比较两种检测手段的局部放电特性和检测性能,本文建立基于高频电流耦合法(HFCT法)和检测阻抗法的电缆中间接头气隙缺陷试验系统,设置了110kV电缆中间接头外半导层气隙缺陷模型,逐级升压激发缺陷的局部放电信号,利用PD-check采集和分析两种方法得到的放电谱图、单次脉冲的时频域特征。实验结果显示,在相同的局部放电测试环境下,检测阻抗法的抗干扰能力及测试灵敏度优于高频电流耦合法。High-frequency current transformer(HFCT)and coupling impedance are important methods to detect partial discharge in high voltage cable.The two methods are different in the device of partial discharge detection and the method of data analysis,so it is difficult to compare the measured data horizontally.Bring difficulty to electric power personnel operation and maintenance.In order to compare the partial discharge characteristics and detection performance of the two detection methods,a test system for air gap defects of cable joints based on HFCT and coupling impedance is established in this paper.The air gap defect model of the outer semi-conductor layer of the 110kV cable is set up,and the voltage applied to the test object was raised step by step to cause PDs.The discharge spectrum and the time-frequency characteristic of the single pulse obtained by the two methods is collected and analyzed by PD-check.The experimental results show that the anti-interference and sensitivity of the coupling impedance is higher than that of the high-frequency current transformer in the same PD testing environment.

关 键 词：电缆中间接头 外半导电层气隙缺陷 局部放电 HFCT法 检测阻抗法 噪声分离 

分 类 号：TM74[电气工程—电力系统及自动化]