一种便携式信号电缆接地故障检测仪

A Portable Signal Cable Fault Location Detector

摘要:

铁路信号室里信号线的数量众多,如何准确定位芯线接地故障的位置是个亟待解决的问题；文章针对故障芯线阻容网络的接地模型,提出了单频幅相法的故障定位方法,即用故障芯线各个测试点的幅相信息来确定故障点的位置,并且为了解决单频幅相法操作上的局限性,提出了基于折合相位差的双频幅相法定位原理；介绍了一种以TMS320C5509A数字信号处理芯片为数据处理和控制核心的便携式信号电缆接地故障检测仪,给出了该系统的工作原理及硬件、软件实现方案；经实验室测试及系统联调,实验室条件下用信号发射装置和信号接收装置对模拟故障电缆进行测试,测试结果表明,设计的测试系统能够定位1 MΩ接地电阻故障；该仪器达到了一定的精度,能较好地适用于工程现场的测试。

Abstract:

There are a lot of signal lines in the signal chamber, how to accurately locate the fault position is a problem to be solved. Aiming at grounding model of fault wire resistance-capacitance network, a single frequency amplitude-phase fault location method was proposed in this paper, that is to determine the position of the fault point according to amplitude-phase information in each test point of the fault component wire. And in response to the operational boundlessness of single frequency amplitude-phase method, dual frequency amplitude-phase location principle based on equivalent phase difference was proposed.A portable signal cable fault location detector is introduced. It has been designed in a compact size by using TMS320 C5509A. The system principle is embodied with hardware and software design. Through test in the laboratory as well as systematic joint debugging, test was conducted on simulated fault cable using sender unit and signal reception device. The result of the test shows that the test system is able to locate the fault of grounding 1 MΩ resistance.The error of fault location indicates that this instrument achieves satisfied precision and works well in engineering environment .