基于相敏检波的地下电缆故障精确定位系统  

Underground Cable Fault Precise Positioning System Based on Phase Sensitive Detection

作　　者：喻尚 周凤星[1] 张智恒 YU Shang;ZHOU Feng-xing;ZHANG Zhi-heng(College of Information Science and Engineering,Wuhan University of Science and Technology,Wuhan 430081,China)

机构地区：[1]武汉科技大学信息科学与工程学院

出　　处：《仪表技术与传感器》2019年第12期56-60,68,共6页Instrument Technique and Sensor

摘　　要：开发了一套地下电缆故障精确定位系统。分析了基于跨步电压相敏检波的故障点判断法以及检波参考信号的获取原理。设计了微弱信号的滤波放大电路、增益自适应调控系统和模拟乘法器型相敏检波模块。该系统能快速分析采样结果并通过显示屏直观地反映给用户,实验表明:该系统能有效抑制噪声干扰,探测精度高,具有很强的实用性。A set of underground cable fault location system was developed.The fault point judgment method based on step-voltage phase-sensitive detection and the acquisition principle of the detection reference signal were analyzed.A filter amplifying circuit,a gain adaptive control system and an analog multiplier phase sensitive detection module for weak signals were designed.The system can quickly analyze the sampling results and intuitively respond to the user through the display screen.Experiments show that the system can effectively suppress noise interference,and has high detection accuracy and strong practicability.

关 键 词：地下电缆 精确定位 相敏检波 微弱信号 增益自适应调控系统 

分 类 号：TP277[自动化与计算机技术—检测技术与自动化装置]