长距离超高压电缆交接试验时分布式局部放电传感器安装位置的优化研究  

Optimization of the Installation Position of Distributed Partial Discharge Sensors on Long Distance EHV Cables During the Commission Test

作　　者：王鸿 卢一晗 盛勇 蒲路 陈姝颖 赵学风 段玮 张居宁 邓军波[4] WANG Hong;LU Yihan;SHENG Yong;PU Lu;CHEN Shuying;ZHAO Xuefeng;DUAN Wei;ZHANG Juning;DENG Junbo(State Grid Shaanxi Electric Power Company Limited,Xi’an 710048,Shaanxi,China;State Grid Shaanxi Electric Power Research Institute,Xi’an 710100,Shaanxi,China;Xianyang Power Supply Company,State Grid Shaanxi Electric Power Company Limited,Xianyang 712000,Shaanxi,China;State Key Laboratory of Electrical Insulation and Power Equipment(Xi’an Jiaotong University),Xi’an 710049,Shaanxi,China)

机构地区：[1]国网陕西省电力有限公司,陕西西安710048 [2]国网陕西省电力有限公司电力科学研究院,陕西西安710100 [3]国网陕西省电力有限公司咸阳供电公司,陕西咸阳712000 [4]电力设备电气绝缘国家重点实验室(西安交通大学),陕西西安710049

出　　处：《电网与清洁能源》2023年第12期104-114,120,共12页Power System and Clean Energy

基　　金：国网陕西省电力有限公司科技项目(5226KY23000L)。

摘　　要：在长距离超高压电缆线路交接验收试验时,将高频电流线圈(high-frequency current transformer,HFCT)安装在交叉互联箱和直接接地箱内的引线末端以检测局部放电信号(明确局部放电信号的传播对于合理布置HFCT十分重要)。对引线电缆与输电电缆金属屏蔽层不同连接方式下局部放电的传播过程进行仿真,使用电缆模域理论将相域下的各导体局部放电信号分解为模域下的同轴模信号和土壤返回模信号,获得了不同连接方式下局部放电信号在线芯、屏蔽层及模域回路中的传播和衰减特性。仿真结果表明:在接头引线上HFCT测量得到的局部放电信号主要是同轴模信号;直通接头引线上流过的局部放电信号比较弱,应优先将HFCT布置在绝缘接头引线的末端。During the commission(handover acceptance)test of long-distance ultra-high voltage cable lines,the highfrequency current coil(HFCT)is installed at the end of the bonding lead in the cross bonding link box and the direct grounding box to detect the PD signal.It is of great importance to know the propagation process of the PD signal for selecting locations of PD sensors.In this paper,the propagation of PD under different connection modes of leading cable and transmission cable metal shield layer is simulated.By using the cable modal domain theory,the PD signal of each conductor in the phase domain is decomposed into coaxial mode signal and earth return mode signal in the modal domain,and then the propagation and attenuation characteristics of the PD signal in the core,shield and modal domain circuits under different connection modes are obtained.The simulation results show that the PD signal measured by HFCT at bonding leads is mainly coaxial mode signal.The partial discharge signal flowing through the lead of the straight through joint is relatively weak,therefore the HFCT should preferably be arranged at the end of the lead of the insulated joint.

关 键 词：电缆局部放电 传播特性 传感器位置 模域理论 

分 类 号：TM247[一般工业技术—材料科学与工程]