基于调频连续波的长距离电缆高阻故障定位精度提升研究  

Location Accuracy Improvement Research for High Impedance Fault of Long-distance Cable Based on Frequency Modulated Continuous Wave

作　　者：李淑蓉 王彬江 朱晓光[1] 赵学风 邓军波[1] 张冠军[1] LI Shurong;WANG Binjiang;ZHU Xiaoguang;ZHAO Xuefeng;DENG Junbo;ZHANG Guanjun(State Key Laboratory of Electrical Insulation and Power Equipment,Xi’an Jiaotong University,Xi’an 710049,China;Electric Power Research Institute of State Grid Shaanxi Electric Power Company,Xi’an 710000,China)

机构地区：[1]西安交通大学电工材料电气绝缘全国重点实验室,西安710049 [2]国网陕西省电力公司电力科学研究院,西安710000

出　　处：《高电压技术》2024年第9期4152-4162,共11页High Voltage Engineering

基　　金：国家自然科学基金(52077167)。

摘　　要：传统频域反射法对于长距离电缆高阻故障检测而言,存在检测效率低、遮蔽区域大、抗干扰能力弱等问题。基于此,提出一种基于调频连续波的定位方法以提升高阻故障定位精度。首先,建立了故障电缆分布参数等效模型,阐述了基于调频连续波积分的故障定位方法。通过向电缆首端注入调频连续波,得到携带高阻故障位置和特征信息的差拍信号,利用广义正交积分算法构建故障诊断函数,进而实现高阻故障定位。其次,仿真分析了长距离电缆在不同位置发生不同严重程度的单点及多点高阻故障的定位结果。最后,在实验室同轴电缆和现场330 kV电缆上进行定位测试,验证了所提方法的有效性。仿真和试验结果表明:基于调频连续波积分的定位方法能够有效定位长距离电缆高阻故障,最大可识别过渡电阻为3 kΩ,定位相对误差<1%;相比于反射系数谱法,该文所提方法具有更高的定位精度、更强的抗噪性能和更长的检测距离。As to high impedance fault detection for long-distance cable,several problems exist on the conventional fre-quency domain reflectometry,such as low detection efficiency,large shielding zone,and weak anti-interference capability.Therefore,a location method based on the frequency modulated continuous wave is proposed in this paper to improve the fault location accuracy.Firstly,the equivalent model of distributed parameters for faulty cable is established,and the fault location method based on the integral of frequency modulated continuous wave is illustrated.The wave is injected into the cable head,and the beat signal which carries the position and characteristic information of high impedance fault is ob-tained.By utilizing the generalized orthogonal integration algorithm,the fault diagnostic function is constructed.Then,the location results of single-and multi-point faults with various fault distances and transition resistances are analyzed via simulations.Finally,the feasibility of the method is verified by coaxial cable in the laboratory and 330 kV cable in the field.The simulated and experimental results show that the method,which is based on the integral of frequency modulat-ed continuous wave,can be adopted to efficiently locate the high impedance fault for long-distance cable.The maximum transition resistance can be identified as 3 kΩ,and the fault location error is within 1%.Compared to the reflection coeffi-cient spectrum method,the proposed method exhibits a high location accuracy,an enhanced anti-noise ability,and an extended detection range.

关 键 词：调频连续波 长距离电缆 高阻故障 故障定位 精度提升 

分 类 号：TM75[电气工程—电力系统及自动化]