输电线路杆塔精细建模及冲击特性的研究
发布时间：2018-09-18 10:50
【摘要】：输电线路雷电过电压导致的绝缘闪络在电力系统事故中占很大比例，因此对输电线路进行防雷性能评估就成为电力线路设计部门的重要任务。准确对输电线路杆塔及杆塔基础进行精细建模，分析研究杆塔在雷电波下的冲击特性，研究杆塔自身基础型式、接地体、根开、土壤电阻率等对杆塔在雷电波下过电压分布的影响，，并进一步计算杆塔耐雷水平和雷击跳闸率，从而提出降低杆塔雷电过电压分布措施具有重要的指导意义和工程应用价值。 本文以220kV输电线路杆塔及基础为对象，研究了其建模方法，并对雷击下的冲击特性进行分析，主要研究内容包括： （1）总结了220kV输电线路杆塔塔身建模方法，并采用多波阻抗模型对220kV典型输电线路杆塔塔身结构进行建模； （2）采用电磁场数值计算方法对220kV输电线路杆塔基础的接地等效阻抗进行了计算，基于等效阻抗通过电路优化方法建立了杆塔基础的等效电路，并对影响基础接地阻抗的各种因素进行了分析； （3）基于输电线路杆塔及基础等效电路，对220kV输电线路杆塔雷击特性进行仿真计算，重点计算了基础型式、接地体、根开、土壤电阻率对杆塔雷电过电压分布的影响；基于计算结果，进一步讨论了降低雷击输电杆塔过电压分布的措施。
[Abstract]:The insulation flashover caused by lightning overvoltage of transmission lines accounts for a large proportion of power system accidents, so it is an important task for power line design departments to evaluate the lightning protection performance of transmission lines. Accurately modeling the transmission line tower and its foundation, analyzing the impact characteristics of the tower under the lightning wave, studying the foundation type of the tower itself, earthing body, root opening, etc. The effect of soil resistivity on the overvoltage distribution of the tower under lightning wave and the calculation of lightning resistance level and lightning tripping rate of the tower are further calculated. Therefore, the measures to reduce the lightning overvoltage distribution of the tower have important guiding significance and engineering application value. In this paper, the modeling method of 220kV transmission line tower and its foundation are studied, and the impact characteristics under lightning strike are analyzed. The main research contents are as follows: (1) summarize the modeling method of 220kV transmission line tower. The multi-wave impedance model is used to model the tower structure of 220kV transmission line. (2) the grounding equivalent impedance of the tower foundation of 220kV transmission line is calculated by using the electromagnetic field numerical method. The equivalent circuit of tower foundation is established by circuit optimization method based on equivalent impedance, and various factors affecting the grounding impedance of base are analyzed. (3) based on transmission line tower and foundation equivalent circuit, The lightning strike characteristics of tower of 220kV transmission line are simulated, and the effects of foundation type, grounding body, root opening and soil resistivity on lightning overvoltage distribution of tower are calculated. Furthermore, the measures to reduce the overvoltage distribution of lightning strike transmission tower are discussed.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM863
本文编号：2247676
[Abstract]:The insulation flashover caused by lightning overvoltage of transmission lines accounts for a large proportion of power system accidents, so it is an important task for power line design departments to evaluate the lightning protection performance of transmission lines. Accurately modeling the transmission line tower and its foundation, analyzing the impact characteristics of the tower under the lightning wave, studying the foundation type of the tower itself, earthing body, root opening, etc. The effect of soil resistivity on the overvoltage distribution of the tower under lightning wave and the calculation of lightning resistance level and lightning tripping rate of the tower are further calculated. Therefore, the measures to reduce the lightning overvoltage distribution of the tower have important guiding significance and engineering application value. In this paper, the modeling method of 220kV transmission line tower and its foundation are studied, and the impact characteristics under lightning strike are analyzed. The main research contents are as follows: (1) summarize the modeling method of 220kV transmission line tower. The multi-wave impedance model is used to model the tower structure of 220kV transmission line. (2) the grounding equivalent impedance of the tower foundation of 220kV transmission line is calculated by using the electromagnetic field numerical method. The equivalent circuit of tower foundation is established by circuit optimization method based on equivalent impedance, and various factors affecting the grounding impedance of base are analyzed. (3) based on transmission line tower and foundation equivalent circuit, The lightning strike characteristics of tower of 220kV transmission line are simulated, and the effects of foundation type, grounding body, root opening and soil resistivity on lightning overvoltage distribution of tower are calculated. Furthermore, the measures to reduce the overvoltage distribution of lightning strike transmission tower are discussed.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM863
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