特高压直流输电线路工程中防雷接地的应用研究
发布时间：2018-11-11 22:08
【摘要】：特高压直流输电线路承担着远距离大容量的输电任务,在电网中占有非常重要的地位。±500kV直流输电线路的运行经验表明,雷击是造成直流输电线路闪络的最主要的因素。因此线路的防雷保护对特高压直流输电线路的安全运行至关重要。由于输电线路沿线不同的地形条件、导线参数、杆塔设计等都会对直流输电线路的雷电性能造成影响,因此有必要对特高压直流输电线路的耐雷性能进行有针对性的研究。对雷电活动参数的统计和分析,得到雷电流幅值概率分布函数和地闪密度,在此基础上得到雷电闪络率的改进计算方法。提出综合考虑特高压直流输电线路地形地貌、周围植被情况及天气条件外界影响因素的杆塔风险评估方法。采用AHP层次分析法评估特高压直流输电线路杆塔区段的雷击闪络风险。研究了特高压直流输电线路的防雷接地措施。通过分析,选定防雷接地措施,进行接地装置设计。同时,通过对新型接地型式的分析应用,选出适合的防雷接地措施。
[Abstract]:Ultra-high voltage direct current (UHVDC) transmission lines assume the task of long distance and large capacity transmission and occupy a very important position in the power network. The operation experience of 卤500kV HVDC transmission lines shows that lightning strike is the most important factor causing the flashover of HVDC transmission lines. Therefore, lightning protection is very important to the safe operation of UHVDC transmission line. The lightning performance of HVDC transmission lines is affected by different terrain conditions, wire parameters and tower design, so it is necessary to study the lightning resistance performance of UHV HVDC transmission lines. Based on the statistics and analysis of lightning activity parameters, the probability distribution function of lightning current amplitude and the ground flashover density are obtained, and the improved calculation method of lightning flashover rate is obtained. A risk assessment method for pole tower is proposed, which takes into account the topography and landform of UHVDC transmission line, the surrounding vegetation and the external factors of weather conditions. The lightning flashover risk of UHVDC transmission line tower section is evaluated by AHP analytic hierarchy process (AHP). Lightning grounding measures for UHV HVDC transmission lines are studied. Through analysis, the lightning grounding measures are selected and the grounding device is designed. At the same time, through the analysis and application of the new type of grounding, the suitable lightning protection measures are selected.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM75;TM863
[Abstract]:Ultra-high voltage direct current (UHVDC) transmission lines assume the task of long distance and large capacity transmission and occupy a very important position in the power network. The operation experience of 卤500kV HVDC transmission lines shows that lightning strike is the most important factor causing the flashover of HVDC transmission lines. Therefore, lightning protection is very important to the safe operation of UHVDC transmission line. The lightning performance of HVDC transmission lines is affected by different terrain conditions, wire parameters and tower design, so it is necessary to study the lightning resistance performance of UHV HVDC transmission lines. Based on the statistics and analysis of lightning activity parameters, the probability distribution function of lightning current amplitude and the ground flashover density are obtained, and the improved calculation method of lightning flashover rate is obtained. A risk assessment method for pole tower is proposed, which takes into account the topography and landform of UHVDC transmission line, the surrounding vegetation and the external factors of weather conditions. The lightning flashover risk of UHVDC transmission line tower section is evaluated by AHP analytic hierarchy process (AHP). Lightning grounding measures for UHV HVDC transmission lines are studied. Through analysis, the lightning grounding measures are selected and the grounding device is designed. At the same time, through the analysis and application of the new type of grounding, the suitable lightning protection measures are selected.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM75;TM863
【参考文献】
相关期刊论文 前10条
1 刘宏;王天正;牛彪;王志利;;山西电网架空输电线路防雷水平分析及防治措施研究[J];电力学报;2016年04期
2 裴e，
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