基于张力监测的输电线路动态增容系统在广东电网的应用

Application of Dynamic Line Rating System Based on Tension Monitoring in Guangdong Power Grid

由于导线张力能反映输电线路的主要运行状态,因此设计了基于耐张段张力测量的输电线路动态增容系统。该系统由安装于杆塔的数据采集终端和设在调度终端的监控管理平台组成,通过对耐张段轴向张力、风速、风向、日照辐射温度和环境温度的实时监测,计算出导线平均温度、各档距弧垂和线路最大允许电流。选取典型1周的系统运行数据进行分析,并将实际运行中输电线路动态载流量与额定载流量进行比较,结果表明:张力和弧垂等监测结果稳定、准确;结合环境温度、风速和风向等因素并考虑一定的裕度,平均提高输电线路载流量20%～30%是能保证线路安全运行的。

The tension of lines reflects major operational status of transmission lines,therefore dynamic line rating system based on tension monitoring is designed for tension measurement.The system is composed of data collection terminal installed on poles and towers and monitoring management platform mounted at dispatching terminal and it calculates average temperature of lines,sag of each span and maximum allowable current via real-time measurement of axis tension,wind speed,wind direction,sunlight temperature and ambient temperature.Data of system operation over one week is typically sampled and analyzed,and dynamic ampacity and rated ampacity of transmission lines are in contrasted with each other.The result shows that the tension and sag are stable and accurate;in combination with ambient temperature,wind speed and wind direction in consideration of margin,the improvement of ampacity by 20% to 30% is assured for safe operation of lines.