基于行波信号的配网成盘电缆长度快速检测方法研究  

Study on Fast Detection Method for Drum Cable Length of Distribution Network Based on Traveling Wave Signal

作　　者：范伟松 厉冰 FAN Weisong;LI Bing(Shenzhen Power Supply Bureau Co.,Ltd.,Guangdong Shenzhen 518000,China)

机构地区：[1]深圳供电局有限公司,广东深圳518000

出　　处：《高压电器》2022年第9期190-196,共7页High Voltage Apparatus

摘　　要：长度检测是配网成盘电缆质量检测的重要项目之一,基于行波信号的长度检测方法具有检测方便快捷、精度较高的优势,具有很高的应用潜力。针对现有基于行波信号的长度检测方法误差较高的问题,文中结合传统脉冲反射法的基本原理,通过分析得出影响其检测精度的主要因素是行波波速的准确获取,并指出其误差主要来自于连接线的影响以及行波到达时刻的准确判断。同时,结合误差来源提出了改进Δ法、脉冲信号法、时频域法3种改进方法以准确检测电缆长度。验证结果表明,相比于脉冲反射法文中提出的3种方法均可提升电缆长度检测的精度。在此基础上,结合测量原理及试验数据分析了各种行波测长方案的优劣,为成盘电缆长度的快速高效检测提供参考。Length detection is one of the key quality inspection items for drum cable of distribution network.The length detection method based on traveling wave signal has such advantages as convenient and fast detection as well as high accuracy and has high application potential.In view of such issue as high error of existing length detection method based on travelling wave signal and in combination with the basic principle of traditional pulse reflection method in this paper,it is concluded through analysis that the main factors affecting its detection accuracy is the ac-curate acquisition of traveling wave velocity.It is also pointed out that its error is mainly from the influence of the con-necting line and the accurate judgment of the arrival time of the traveling wave.Meanwhile,such three improvement methods asΔmethod,pulse signal method as well as time-frequency domain method are proposed in combination with error source to detect length of the cable accurately.The verification results show that,compared to the pulse reflec-tion method,the three kinds of methods proposed in this paper can improve accuracy of the length detection of cable.On that basis,the pros and cons of various travelling wave length detection schemes are analyzed in combination with the measurement principle and test data in order to provide reference for fast and efficient length detection of cable.

关 键 词：成盘电缆 行波信号 波速标定 长度检测 

分 类 号：TM75[电气工程—电力系统及自动化]