【摘要】：輸電線路雷電過電壓導(dǎo)致的絕緣閃絡(luò)在電力系統(tǒng)事故中占很大比例，因此對輸電線路進行防雷性能評估就成為電力線路設(shè)計部門的重要任務(wù)。準確對輸電線路桿塔及桿塔基礎(chǔ)進行精細建模，分析研究桿塔在雷電波下的沖擊特性，，研究桿塔自身基礎(chǔ)型式、接地體、根開、土壤電阻率等對桿塔在雷電波下過電壓分布的影響，并進一步計算桿塔耐雷水平和雷擊跳閘率，從而提出降低桿塔雷電過電壓分布措施具有重要的指導(dǎo)意義和工程應(yīng)用價值。 本文以220kV輸電線路桿塔及基礎(chǔ)為對象，研究了其建模方法，并對雷擊下的沖擊特性進行分析，主要研究內(nèi)容包括： （1）總結(jié)了220kV輸電線路桿塔塔身建模方法，并采用多波阻抗模型對220kV典型輸電線路桿塔塔身結(jié)構(gòu)進行建模； （2）采用電磁場數(shù)值計算方法對220kV輸電線路桿塔基礎(chǔ)的接地等效阻抗進行了計算，基于等效阻抗通過電路優(yōu)化方法建立了桿塔基礎(chǔ)的等效電路，并對影響基礎(chǔ)接地阻抗的各種因素進行了分析； （3）基于輸電線路桿塔及基礎(chǔ)等效電路，對220kV輸電線路桿塔雷擊特性進行仿真計算，重點計算了基礎(chǔ)型式、接地體、根開、土壤電阻率對桿塔雷電過電壓分布的影響；基于計算結(jié)果，進一步討論了降低雷擊輸電桿塔過電壓分布的措施。
[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.
【學(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM863

【參考文獻】

相關(guān)期刊論文 前7條

1 李培國;國外對特高壓輸電線路雷擊跳閘原因的一個新觀點[J];電網(wǎng)技術(shù);2000年07期

2 舒印彪,趙丞華;研究實施中的500kV同塔雙回緊湊型輸電線路[J];電網(wǎng)技術(shù);2002年04期

3 范建斌,鄭健超,王來;雷電沖擊電壓下沿面閃絡(luò)特性的研究[J];電網(wǎng)技術(shù);2003年02期

4 張志勁,孫才新,蔣興良,舒立春,胡建林;層次分析法在輸電線路綜合防雷措施評估中的應(yīng)用[J];電網(wǎng)技術(shù);2005年14期

5 陳國慶,張志勁,孫才新,司馬文霞;輸電線路耐雷性能計算方法的研究現(xiàn)狀分析[J];重慶大學(xué)學(xué)報(自然科學(xué)版);2003年05期

6 錢冠軍,王曉瑜,汪雁,詹花茂;輸電線路雷擊仿真模型[J];中國電機工程學(xué)報;1999年08期

7 文武,阮江軍,陳允平,莫付江,甘艷,徐亮;架空傳輸線在間接雷擊作用下負載浪涌的分析[J];中國電機工程學(xué)報;2003年01期

本文編號：2247675