特高壓直流輸電線路工程中防雷接地的應用研究
發(fā)布時間：2018-11-11 22:08
【摘要】：特高壓直流輸電線路承擔著遠距離大容量的輸電任務,在電網(wǎng)中占有非常重要的地位。±500kV直流輸電線路的運行經(jīng)驗表明,雷擊是造成直流輸電線路閃絡的最主要的因素。因此線路的防雷保護對特高壓直流輸電線路的安全運行至關重要。由于輸電線路沿線不同的地形條件、導線參數(shù)、桿塔設計等都會對直流輸電線路的雷電性能造成影響,因此有必要對特高壓直流輸電線路的耐雷性能進行有針對性的研究。對雷電活動參數(shù)的統(tǒng)計和分析,得到雷電流幅值概率分布函數(shù)和地閃密度,在此基礎上得到雷電閃絡率的改進計算方法。提出綜合考慮特高壓直流輸電線路地形地貌、周圍植被情況及天氣條件外界影響因素的桿塔風險評估方法。采用AHP層次分析法評估特高壓直流輸電線路桿塔區(qū)段的雷擊閃絡風險。研究了特高壓直流輸電線路的防雷接地措施。通過分析,選定防雷接地措施,進行接地裝置設計。同時,通過對新型接地型式的分析應用,選出適合的防雷接地措施。
[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 鹵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.
【學位授予單位】：華北電力大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：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 鹵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.
【學位授予單位】：華北電力大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TM75;TM863
【參考文獻】
相關期刊論文 前10條
1 劉宏;王天正;牛彪;王志利;;山西電網(wǎng)架空輸電線路防雷水平分析及防治措施研究[J];電力學報;2016年04期
2 裴e，
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