110 kV线路钢芯铝绞线断裂分析

Fracture Failure Analysis of Aluminum Conductor Steel Reinforced in 110 kV Transmission Line

摘要:

某110 kV输电线路钢芯铝绞线运行22年后断裂，导致接地距离I段动作跳闸，严重影响了线路的安全稳定运行。通过运行情况调查、宏观检查、扫描电镜分析、力学试验、材质分析等技术方法对导线断裂原因进行分析。结果表明，钢芯铝绞线中铝线抗拉强度偏低，表面磨损导致承载力进一步降低，在特殊气象条件下被逐渐拉断是本次故障的主要原因。针对断裂原因，提出了评估同批次导线运行安全可靠性、加强同批次导线断股情况巡视、严格把控新入网导线质量的防护建议。

Abstract:

A aluminum conductor steel reinforced (ACSR) in 110 kV transmission line is broken after the operation for 22 years, which seriously affects the safe and stable operation of transmission line. The reasons of fracture failure are analyzed through running condition investigation, visual examination, scanning electronic microscopy analysis, mechanical test and material analysis. The results show that low tensile strength and surface wear of ACSR are the main reason of fracture failure. Some protection suggestions are put forward to prevent such fracture failure.