本文關(guān)鍵詞：新密礦區(qū)35kV電網(wǎng)防雷計(jì)算分析　出處：《河南理工大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 線路防雷 耐雷水平 雷擊跳閘率 侵入波 防雷措施

【摘要】：新密礦區(qū)供電網(wǎng)絡(luò)中,35kV等級的供電系統(tǒng)擔(dān)負(fù)著大部分煤礦的供電任務(wù),因此必須保證其運(yùn)行的安全性、穩(wěn)定性和可靠性。但由于該地區(qū)35kV供電線路所經(jīng)地區(qū)大部分為山區(qū)丘陵地帶,地形比較復(fù)雜,地勢起伏變化大,雷電活動頻繁且強(qiáng)度大,土壤電阻率偏高,致使每年雷雨季節(jié)時,防雷成為雨季“三防”工作的重中之重,盡管采取了一部分防雷措施,但是效果并不理想,雷擊造成生產(chǎn)和生活供電設(shè)施損害的事故常有發(fā)生,因此研究該地區(qū)35kV供電系統(tǒng)防雷技術(shù)和措施是十分必要的。本文依據(jù)35kV平申線路多年的防雷運(yùn)行資料和整條線路實(shí)測的基本電氣參數(shù),在考慮地形地勢、桿塔檔距、桿塔接地電阻等因素對輸電線路影響的基礎(chǔ)上,建立雷擊線路的仿真計(jì)算模型。在分析這些模型的基礎(chǔ)上,首先研究總結(jié)了哪些因素會影響線路的耐雷水平和雷擊跳閘率,然后重點(diǎn)研究線路在加裝避雷線、避雷器以及改變桿塔沖擊接地電阻前后,耐雷水平的變化情況,總結(jié)仿真結(jié)果,得出通過采取這些措施對降低雷擊跳閘率是行之有效的。除了做線路防雷分析外,針對35kV變電站雷電侵入波的危害也進(jìn)行了仿真分析,即考慮雷擊桿塔時,雷電侵入波對變電站內(nèi)主要電氣設(shè)備的影響,還深入分析雷擊點(diǎn)發(fā)生變化時,在改變進(jìn)線段桿塔的沖擊接地電阻情況下,雷電侵入波受影響的程度,為完善變電站的防雷提供了依據(jù)。通過仿真計(jì)算分析,總結(jié)了引起35kV平申線路雷擊跳閘率高的主要因素,結(jié)合工程實(shí)際情況提出在易擊桿塔上加裝線路型避雷器,如有可能,盡可能全線架設(shè)避雷線,降低桿塔接地電阻等各項(xiàng)綜合措施,以提高新密礦區(qū)35kV線路耐雷水平,降低雷擊跳閘率。
[Abstract]:Xinmi coal mine power network, power supply system of 35kV grade is responsible for most of the coal supply tasks, it is necessary to ensure the safety, stability and reliability. But due to the 35kV power supply line in the area of the region mostly mountainous hilly areas, the terrain is more complex, the terrain changes, frequent lightning activity and high strength that year, high soil resistivity, thunderstorm season, lightning protection become a priority among priorities during the rainy season three work, despite a part of lightning protection measures, but the effect is not ideal, the production and life of the power supply facilities caused by lightning damage accidents often occur, so the research area of 35kV power supply system and lightning protection measures is very the necessary basic electrical parameters. On the basis of the lightning protection data line 35kV Pinchen years and the whole line is measured, considering the topography, tower span, bar The effect of tower grounding resistance of transmission line, establish the lightning simulation calculation model. Based on the analysis of these models, the thesis summarizes the factors which affect the line lightning withstand level and lightning trip rate, then focus on the line in the installation of lightning arrester and change line tower grounding the resistance changes before and after the lightning protection level, summarizing the simulation results obtained by these measures are effective to reduce the lightning trip rate. In addition to analysis of lightning protection for 35kV substation, lightning damage is analyzed, including the lightning, lightning invasion wave effect on the main electrical equipment in substation also, in-depth analysis of the lightning point changes, changes in the inlet line of tower impulse grounding resistance, lightning invasion wave is affected by the degree of improvement Provide the basis for substation lightning protection. Through simulation analysis, summarized the main factors causing 35kV Pinchen lightning trip out rate is high, according to the actual situation of engineering to install arresters in easy to hit the tower, if possible, as far as possible across the board set up bileixian, reducing tower grounding resistance and other comprehensive measures in order to improve the mining area of Xinmi 35kV, the lightning impulse withstand level, reduce the rate of lightning trip.

【學(xué)位授予單位】：河南理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM863

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