基于GSM网络的输电线路故障在线监测系统

为克服根据行波传播理论考虑线路结构特点等进行检测和信号分析的传统输电线路故障定位方法易受线路具体情况和信号传播衰减、干扰的缺点,提出了基于GSM无线通信网络建立的输电线路故障监测系统。这种系统采用自制的电流传感器直接监测线路铁塔上流过的故障电流,经信号处理和识别后,通过GSM网络以短消息方式进行数据的无线通讯,以监测、定位输电线路故障。实验室冲击电流和工频放电实验证明自制电流传感器在0～500A的工频电流和0～2kA的冲击电流作用下,传感器和测量回路的误差均<±3%。开发的检测系统经过测试线路上试运行,证实了其可行性和运行稳定性。

Online Monitoring System Based on GSM Network for Transmission Line Fault

The accuracy of traditional transmission line fault location methods,which are based on the wave transmission theory,signal detection and processing,depends on the structure of the transmission line and is easy to be influenced by the transmission loss and interference.Aiming at solving this problem,a monitoring and location system based on the direct fault current detection and GSM communication technology is introduced.In the system,the current detector measures the fault current on the tower,a MPU & GSM module is used as the data processing and communication unit.The developed current detector is calibrated in laboratory through impulse current test and power-frequency discharge test respectively.The test results show that the error of the detector is lower than 3% under 0~2kA impulse current and 0~500A power-frequency current. The preliminary operating experience demonstrates the feasibility of the developed transmission line fault monitoring and location system.