110kV输电线路防雷要点及运维管理探讨
2018-09-13崔兴佼林春旭
崔兴佼 林春旭
摘 要:110kV输电线路在我国分布广泛,输送电力范围也比较大,基本实现了全国覆盖,极大地方便了居民的工作与生活。但在110kV输电线路运行过程中,经常受到雷电因素的影响,尤其是山区或丘陵地区,遭受雷电的可能性更大,轻则导致线路外部绝缘体严重受损,重则使整个输电线路陷入瘫痪,影响电力资源的正常供应。文章将从雷击对输电线路的危害出发,针对110kV输电线路防雷技术要点进行分别介绍,并就如何加强输电线路运维管理展开详细论述。
关键词:输电线路;雷击危害;防雷技术;运维管理
中图分类号:TM863 文献标志码:A 文章编号:2095-2945(2018)23-0193-02
Abstract: 110kV transmission lines are widely distributed in our country, the scope of power transmission is also relatively large, basically realized the national coverage, greatly facilitated the work and life of residents. But in the process of 110kV transmission line operation, it is often affected by lightning factors, especially in mountainous or hilly areas, the possibility of lightning is greater. At the light, the insulator outside the transmission line is seriously damaged, and the whole transmission line is paralyzed at the same time. Affect the normal supply of power resources. This paper introduces the lightning protection technology of 110 kV transmission line from the harm of lightning strike to transmission line, and discusses how to strengthen the management of transmission line operation and maintenance in detail.
Keywords: transmission line; lightning hazard; lightning protection technology; operation and maintenance management
1 雷击对输电线路的危害分析
输电线路作为电网输送的重要内容,直接关系到电力的正常供应。在电网运行过程中,由于输电线路设置、雷击电流的大小、杆塔自身电阻以及绝缘物体等各种因素的影响,导致输电线路经常遭受雷击。雷电天气时,当雷电与输电线路接触,便会产生雷电电流,部分雷电电流会直接被导入大地,倘若输电线路未能作避雷设计处理,那么雷电电流就会对输电线路运行造成不利影响。
输电线路经常遇到的雷击危害主要是雷电反击与雷电绕击,尽管不少输电线路大多安装了避雷设施,但是雷电电流能够绕过避雷设施,对输电线路造成雷击,进而导致线路跳闸甚至瘫痪。雷电绕击作用会受到导线保护角以及杆塔高度的影響,这些因素会影响雷电的绕击,增加输电线路遭受雷电绕击的可能性。……
