基于小波分析的电力电缆行波在线故障定位技术

发布时间：2018-05-19 05:37

本文选题：电力电缆 + 小波分析　；参考：《西南交通大学》2014年硕士论文

【摘要】：电力电缆具有节约用地,可靠性高,环境影响小,维护工作量少等特征,因此得到了广泛应用。随着铁路建设进程的加快,电缆线路在铁路电力供电系统中的比例日益增加,电缆故障几率也随之增大,对正常的生产和生活带来较大影响。从而,使得不断开发、应用更先进、更准确的电缆线路故障测距技术进行故障定位受到越来越多的重视。本文从铁路工程实际出发,结合电力电缆故障类型及原因分析,应用先进的行波测距原理及小波分析技术来进行电力电缆的故障测距。论文首先对国内外电力电缆故障定位技术进行了简要介绍,对电缆故障类型及其成因进行了详细阐述,分析了安装和施工质量、外力破坏、电缆及其附件质量等产生故障的因素。在此基础上,应用行波测距技术和小波变换理论,对脉冲电流测距法进行了深入分析；搭建了脉冲电流测距法测距系统硬件,并对相应硬件进行了设备选型及功能设定,即采用双通道数字存储卡作为数据采集单元,罗戈夫斯基线圈结构作为线性电流耦合器,稳定可靠的工控机作为显示、数据运算、输出及交互终端。在获得可靠数据的基础上,结合软件工程技术,设计了故障定位系统软件,通过软件系统和软硬件的综合调试,完成了数据分析与具体实现。最后,将该装置应用于实际工程中,并对现场测得故障位置数据和实际故障位置进行了对照分析,误差小于2.2%,达到预期目标,说明该装置满足精度要求。现场案例验证了该电缆故障定位系统的可行性,为铁路电力供电系统的电力电缆故障定位提供了实践和理论参考依据。
[Abstract]:Power cable is widely used because of its advantages of saving land, high reliability, low environmental impact and less maintenance workload. With the speeding up of railway construction, the proportion of cable line in railway power supply system is increasing day by day, and the probability of cable fault increases, which has great influence on normal production and life. Therefore, more and more attention has been paid to fault location of cable line fault location technology. Based on the actual situation of railway engineering, combined with the fault type and reason analysis of power cable, the advanced traveling wave location principle and wavelet analysis technique are applied to fault location of power cable. Firstly, the paper briefly introduces the fault location technology of power cable at home and abroad, expounds the types of cable faults and their causes in detail, analyzes the installation and construction quality, and external force damage. Cable and its accessories quality and other causes of failure. On this basis, using traveling wave ranging technology and wavelet transform theory, the pulse current ranging method is deeply analyzed, the hardware of the pulse current ranging system is built, and the equipment selection and function setting of the corresponding hardware are carried out. The dual channel digital memory card is used as the data acquisition unit, the Rogowski coil structure is used as the linear current coupler, and the stable and reliable industrial control computer is used as the display, data operation, output and interactive terminal. On the basis of obtaining reliable data and combining with software engineering technology, the software of fault location system is designed. Through the comprehensive debugging of software system and hardware and software, the data analysis and concrete realization are completed. Finally, the device is applied to practical engineering, and the fault location data measured in the field are compared with the actual fault location. The error is less than 2.2, and the expected goal is achieved, which shows that the device meets the precision requirements. Field cases verify the feasibility of the cable fault location system and provide a practical and theoretical reference for the power cable fault location of railway power supply system.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM75

【参考文献】