Transmission cable fault detector based on waveform reconstruction  

一种具有波形复现功能的电缆故障测试仪(英文)

作　　者：吴剑锋[1] 于忠洲[1] 李建清[1] 王蕾[2] 李小敏[1] 

机构地区：[1]东南大学仪器科学与工程学院,南京210096 [2]南京工程学院自动化学院,南京210013

出　　处：《Journal of Southeast University(English Edition)》2013年第1期48-51,共4页东南大学学报（英文版）

基　　金：The National Natural Science Foundation of China(No.61240032);the Natural Science Foundation of Jiangsu Province(No.BK2012560);the College Scientific and Technological Achievements Transformation Promotion Project of Jiangsu Province(No.JH-05);the Science and Technology Support Program of Jiangsu Province(No.BE2012740)

摘　　要：In order to improve the accuracy of cable fault position location at a low cost and make the testing results intuitive, a cable fault detector based on wave form reconstruction is designed. In this detector, the cable fault position is located based on the time-domain pulse reflection （TDR） principle. A pulse waveform is injected in the tested cable, and a high-speed comparator with changeable reference voltages is used to binarize the test pulse waveform to a binary sequence on a certain voltage. Through scanning the reference voltage in a full voltage range, multi-sequences are acquired to reconstruct the pulse waveform transmission in the cable, and then the pulse attenuation feature, electrical open circuit fault, electrical short circuit fault, and the fault position of the cable are diagnosed. Experimental results show that the designed cable fault detector can determine the fault type and its position of the cable being tested, and the testing results are intuitive.为了以较低成本提高电缆故障点的定位精度,并且使测试结果更加直观,设计了一种具有波形复现功能的电缆故障测试仪,该测试仪采用时域脉冲反射原理进行电缆故障点定位.测试时,首先将电磁脉冲加载到待测电缆,依据相应高速比较器的参考电压将测试脉冲波形二值化获得单次测试位流数据,然后将参考电压由高到低逐次扫描所得位流数据依次排列,重构并复现测试脉冲波形,进而可以得到电缆脉冲衰减特性、短路故障、断路故障及故障位置的诊断.实验测试结果表明,该测试仪能够有效测定电缆的故障类型和位置,测试结果直观.

关 键 词：cable fault test waveform reconstruction fault position location time-domain pulse reflection 

分 类 号：TP216[自动化与计算机技术—检测技术与自动化装置]