激光清除输电线路异物时异物烧蚀特性分析

Analysis of ablation characteristics of foreign bodies in power transmission lines by laser

利用高能激光清除输电线路缠绕异物的方法取得了较好的使用效果。以5种典型输电线路异物材料为研究对象,建立有限元仿真模型,分析激光烧蚀异物的温度分布及其微观变化规律,并进行了激光烧蚀实验。结果表明,激光照射异物时,异物中心到边缘温度逐渐降低,高温的中心部分先熔化,低温部分热量积累使温升至熔点熔化,形成"V"形凹坑。在激光加热异物的过程是周向和纵深方向同时发展的,且纵深方向发展快于周向的发展速度。激光功率达到200 W时,可以清除绝大部分有色异物,亮白色异物也可被清除,激光清除异物的效率在1 mm/s至2 mm/s之间,激光清除异物的效率较高,此研究成果为激光应用于清除输电线路缠绕异物工作提供了重要依据。

The method of using high energy laser to remove the winding foreign matter of transmission line has achieved good results.In this paper,five kinds of typical foreign materials of transmission line are taken as the research object,and the finite element simulation model is established to analyze the temperature distribution and micro variation law of laser ablation foreign body.The laser ablation experiment was carried out.The results show that the temperature from the center to the edge of the foreign body decreases gradually when the laser irradiates the foreign body.The high temperature part melts first,and the low temperature part accumulates heat to make the temperature rise to the melting point,forming a"V"shaped pit.In the process of laser heating foreign body,the development of circumferential and deep direction is simultaneous,and the development speed of depth direction is faster than that of circumferential direction.When the laser power reaches 200 W,most of the colored foreign bodies can be removed,and the bright white foreign bodies can also be removed.The efficiency of laser removing foreign matters is between 1 mm/s and 2 mm/s,and the efficiency of laser removing foreign matters is higher.The research results provide an important basis for the application of laser in the removal of foreign bodies wrapped in transmission lines.