硕论 乡村振兴背景下农村集体产权制度改革研究——以枣庄市台儿庄区为例 (4).docxVIP

摘 要 雷电灾害严重影响人们的正常生活，从设施损坏到发生大面积的停电事故，因此防雷电灾害依然是电力系统安全稳定运行的关键。根据调查显示，雷击事故会产生严重的后果，比如说造成输电线路杆塔的单相闪络，严重的情况下甚至会产生两回同跳的严重跳闸事故。 本文根据十堰山区的特殊地形与地貌﹑复杂线路结构等因素，采雷电事故频繁发生，当地电力系统的稳定受到严重威胁。在过去的五年中，该地区220kV线路多次发生雷击闪络事故，造成事故的原因多数为雷电所引起的杆塔反击跳闸，这严重影响了十堰地区电力系统的安全和可持续运行。本文研究并重现了该地区的两条220 kV输电线路的故障。并对该地区的反击耐雷性能进行评估，采取差异化防雷为防雷准则，制定防雷策略，可以有效减少该地区杆塔的跳闸率，促进电力系统的安全稳定运行。 本文对防雷评估过程中所做的工作包括输电线路杆塔上雷电感应电压的计算、雷电主要参数的详细分析、Bergeron算法的介绍以及电磁暂态软件EMTP中的典型模块进行详细阐述，为十堰地区的220kV输电线路反击事故的分析与建模提供了研究方向和依据。利用EMTP电磁暂态软件建立220kV单回与双回输电线路雷电反击模型，并以数据验证该模型的理论可靠性，用于计算输电线路的反击耐雷水平。仿真结果表明，工频电压相位直接决定了导线的闪络顺序。影响塔架防雷水平的最关键因素是接地电阻的大小。根据测试数据，同塔双回输电线路的着陆电阻最佳水平是低于10Ω。高度平衡的绝缘层还可以显着提高塔筒反击的抗雷水平，使用不平衡的绝缘层可以防止同时发生双回路闭合事故。 关键词：220kV输电线路，杆塔，雷击，防雷保护 Abstract Lightning disaster seriously affects peoples normal life, from the damage of facilities to the occurrence of large-scale blackout accidents, so the prevention of lightning disaster is still the key to the safe and stable operation of the power system. According to statistics, lightning accident will not only cause single-phase flashover of transmission line tower, but also cause serious tripping accident of two circuits at the same time. According to the special topography, complex line structure and other factors in Shiyan mountain area, lightning accidents occur frequently, and the stability of local power system is seriously threatened. In the past five years, lightning flashover accidents occurred many times on 220kV transmission lines in this area. Most of the accidents were caused by tower counterattack trip caused by lightning, which had a bad impact on the safe and stable operation of power system in Shiyan area. In this paper, the fault analysis and recurrence of two 220kV transmission lines in this area are carried out, and the lightning resistance performance of the area is evaluated. The differentiated lightning protection is adopted as the lightning protection criterion, and the lightning protection strategy is formulated, which has reference significance for reduci