2018年1月安徽电网输电线路覆冰舞动故障规律分析

Analysis of Faults of Icing and Galloping of Transmission Lines in Anhui Power Grid in January of 2018

对2018年1月安徽电网出现的大面积输电线路覆冰舞动故障和设备受损规律进行了分析,结合气象资料和线路结构参数,对输电线路舞动形成的原因进行分析。结果表明线路跳闸主要原因为持续冻雨和大风激励下,线路发生舞动,引起相间或导线对地线距离不足放电;设备受损主要原因为长时间的导线舞动造成直线塔绝缘子球头疲劳破坏后断裂,引发导线掉落,以及耐张塔长时间承受动态不平衡张力而损坏。故障分析结论对安徽电网舞动防治具有重要意义。

The faults of icing and galloping of transmission lines and equipment damages that occurred in Anhui electric power grid in January of 2018 are analyzed. Based on the meteorological data and the structural parameters of the lines, the reasons for the formation of galloping transmission lines are analyzed. The results show that line tripping is mainly caused by wire galloping in condition of continuous freezing rain and strong wind, leading to insufficient discharge between phases or wires to the ground. The equipment damages are attributed to the fatigue fracture of the insulator of the linear tower and the wire falling resulting from long-term wire galloping as well as the dynamic imbalance tension of the strain tower. The conclusion of the fault analysis is of great significance to the prevention and control of galloping for Anhui power grid.