架空输电线路过电压在线监测系统

On-Line Monitoring System for the Overvoltage of Overhead Transmission Lines

现有的过电压在线监测装置主要是针对变电站内的电气设备进行设计的,然而架空输电线路上的过电压与变电站内的过电压,其波形和幅值差异较大。同时,现有的故障录波器受自身功能的限制,不能对快速变化的过电压进行数据采集。因此提出了一种架空输电线路过电压在线监测系统,并对该在线监测系统进行硬、软件设计,分析了各部分组成结构和工作原理,同时提出了软件设计思想和运行流程图。对该装置进行性能测试,结果表明该在线监测系统在工频和冲击电压下,传感器测量精度高,嵌入式监测装置数据采集和储存可靠,与地面工作站通讯良好。

Existing overvoltage online monitoring devices are mainly designed for the electrical equipment within substations, but the overvohage on overhead transmission lines and the overvohage within substations have different waveforms and amplitudes. The data acquisition of the existing fault recorder is restricted by its own function, and it does not support the data acquisition for the rapidly changing overvoltage. Therefore, this paper proposes a transmission line overvohage online monitoring system and carries out hardware and software deigns for the system. It analyzes the structural composition and working principle of each component and puts forward the software design concept and operational flow chart. Finally, the frequency and impulse voltage experiment has proved that the monitoring system is of better measurement accuracy, the data acquisition function and storage of the embedded monitoring device work with high reliability, and the system communicates well with the monitoring computer.