电力电缆故障定位方法研究及在线检测装置实现

发布时间：2018-03-07 17:50

本文选题：电力电缆　切入点：行波　出处：《长沙理工大学》2009年硕士论文　论文类型：学位论文

【摘要】： 电力电缆在电力系统中应用广泛,由于电缆绝缘老化、受潮以及机械损伤等因素,随着运行时间增长,故障发生概率有逐年增加的趋势。因此,对电缆故障点在线检测具有迫切的现实意义。本课题旨在通过对电力电缆故障点测距常用方法和技术进行分析和比较,探索易于进行在线检测的方法和技术实现方法。本文以35kV交联聚乙烯绝缘电力电缆为原型,用ATP/EMTP建立了一个电力电缆系统仿真模型,并用该模型仿真了不同接地方式下的故障电流行波波形特征,分析了多种因素对故障行波的影响。故障分析过程中采用小波变换局部模极大值的方法检测故障行波的突变点特征,通过小波的故障点奇异性判据判断是否发生故障,并采用合适的测距算法来计算故障点距离。为了实现电缆故障点的在线检测,本文完成了电力电缆故障点在线监测系统的软硬件设计。硬件部分主要包括DSP工作电路设计、信号调理电路设计、A/D转换电路设计、电源模块电路设计、时钟电路以及复位电路设计。软件部分完成了基于DSP系统的小波算法,以及基于GPRS的无线数据传输工作流程设计。电缆端头一般都不在变电站内,安装在电缆端头的监测装置所测试的数据要采用通信技术才能及时传输到变电站。本文采用公共GPRS无线通信技术进行数据实时传输,将非变电站内的电缆故障点检测数据信息及时传输到变电站调度中心。采用GPRS技术进行通信的优点是不用组网,按流量计费,终端可长时间挂接在网上,通信成本低廉。利用SIM100模块对GPRS无线数据传输性能进行了试验,试验结果显示数据传输准确可靠。本文从电力电缆故障点检测方法和在线检测实现方法两个方面论述了对电缆故障点进行快速诊断的可行性。
[Abstract]:Power cable is widely used in power system. Due to the aging of cable insulation, damp and mechanical damage, with the increase of running time, the probability of failure is increasing year by year. The purpose of this paper is to analyze and compare the common methods and techniques of power cable fault point location, and to explore the methods and techniques that are easy to carry out on-line detection. In this paper, using 35 kV XLPE insulated power cable as prototype, a power cable system simulation model is established by using ATP/EMTP, and the characteristics of fault current traveling wave waveform under different grounding modes are simulated. The influence of many factors on the fault traveling wave is analyzed. In the process of fault analysis, the local modulus maximum of wavelet transform is used to detect the characteristic of the abrupt point of the fault traveling wave, and the singularity criterion of the fault point of the wavelet is used to judge whether the fault occurs or not. An appropriate location algorithm is used to calculate the fault point distance. In order to realize the on-line detection of cable fault points, the hardware and software design of on-line monitoring system for power cable fault points is completed in this paper. The hardware part mainly includes the design of DSP working circuit, the design of signal conditioning circuit and the design of A / D conversion circuit. Power module circuit design, clock circuit and reset circuit design. The software part completes the wavelet algorithm based on DSP system and the design of wireless data transmission workflow based on GPRS. The data tested by the monitoring device installed in the terminal of the cable are usually not in the substation, and the data can be transmitted to the substation in time only by using the communication technology. This paper adopts the public GPRS wireless communication technology to transmit the data in real time. The data of cable fault point detection in non-substation is transmitted to the substation dispatching center in time. The advantage of using GPRS technology to communicate is that the terminal can be connected to the network for a long time without netting and charging according to the flow rate. The communication cost is low. The performance of GPRS wireless data transmission is tested by using SIM100 module. The test results show that the data transmission is accurate and reliable. This paper discusses the feasibility of fast diagnosis of power cable fault points from two aspects: detection method of power cable fault point and realization method of on-line detection.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2009
【分类号】：TM755

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