导线覆冰监测系统的力学模型与预警功能优化  

Mechanical Model of Transmission Line Icing Monitoring Systems and Optimization of Alarm Function

作　　者：张乐[1] 周步祥[1] 王小红[1] 罗欢[1] 傅利[1] 

机构地区：[1]四川大学电气信息学院,成都610065

出　　处：《电力系统及其自动化学报》2014年第11期42-46,共5页Proceedings of the CSU-EPSA

摘　　要：研究输电线路覆冰在线监测系统的覆冰厚度预测模型以及预警功能的实现与优化。以覆冰线路为研究对象,对其进行力学分析,考虑耐张绝缘子串等不均匀载荷以及风偏平面的载荷,建立了输电线路综合荷载的等值覆冰厚度预测模型,并依据该模型建立导线覆冰在线监测系统。运用输电线路内部循环应力与疲劳振动次数的s-N曲线得出输电线路强度衰减的计算公式,依据导线剩余强度给出导线疲劳度概念及公式,并考虑导线疲劳度对覆冰监测系统的预警值进行修正。实验结果表明,监测系统可以更准确地发出报警信号。Research on the ice thickness prediction models of transmission lines icing online monitoring system and alarm function optimizationis is carried out in this paper.Mechanical analysis for icing on the line is conducted by considering tension insulator strings or other uneven loads and loads of wind partial plane.The transmission line equivalent ice thickness integrated load forecasting model is established.Then,based on the results of prediction model,the monitoring system for the line icing is realized.By using transmission lines s-N curve formula for calculating the strength of the transmission line attenuation,the conductor wire fatigue concepts and formulas are given based on residual strength.The correction of alarm value isput forward by considering the wire fatigue.Experimental results show that the monitoring system can be more timely to release alarm sigualto avoid further damage to the line.

关 键 词：覆冰预测 不均匀载荷 力学分析 剩余强度 导线疲劳 预警值校正 

分 类 号：TM75[电气工程—电力系统及自动化]