基于脉冲调制技术的电力电缆防盗定位监测系统研究

Research in Anti-Theft Position Monitoring System of Power Cable Based on Pulse Modulation Technique

摘要: 针对电力电缆被盗时常见诸报端现状，结合行波法基本理论，研制得到基于脉冲调制技术的电力电缆防盗定位监测系统。系统包括脉冲发射电路、脉冲回波AD采样电路和回波测量电路以及GSM无线通讯及蜂鸣器报警电路模块。由于固定低压脉冲波的存在较大测量盲区以及高频谐波分量造成波形畸变问题，采用脉冲调制技术实现对不同电力电缆的长度的防盗监测。最后通过试验测试表明，基于脉冲调制技术的电力电缆防盗定位装置，能够快速诊断出系统被盗，并且得到测量结果具有误差低，反应迅速特征。理论与试验验证了设计系统装置的准确性。

Abstract: The occurrences of cable theft often hits the newspapers, an anti-theft position monitoring system is designed based on the pulse modulation technique and the basic theory of travelling wave method. The system includes a pulse transmitter circuit, AD sampling circuit, measuring circuit, GSM wireless communications, and buzzer alarm circuit module. Owing to the shortage of an obvious blind zone in measuring the pulse and the existence of waveform distortion for the high-frequency harmonic components, the traditional method using fixed pulse wave cannot satisfy the requirement of accuracy. The pulse modulation technique is used to achieve security monitoring of the power cables. Finally, experimental tests have shown that the developed positioning device can monitor the status of power cable and quickly diagnose whether the cable is stolen or not. In addition, the measurement shows that the system has a low error and rapid response characteristics. The theoretical method and experiment verify the accuracy of the system unit.