【正文】 遼寧科技學(xué)院本科生畢業(yè)設(shè)計 第 I 頁 110KV 降壓變電所電氣一次部分及防雷保護(hù)設(shè)計 摘 要 隨著現(xiàn)代文明的發(fā)展與進(jìn)步，社會生產(chǎn)和生活對電能供應(yīng)的質(zhì)量和管理提出了越來越高的要求 ， 作為電能傳輸與控制的中間樞紐，變電所必須改變傳統(tǒng)的設(shè)計和控制模式，才能適應(yīng)現(xiàn)代電力系統(tǒng)、現(xiàn)代化工業(yè)生產(chǎn)和社會生活的發(fā)展趨勢 ，變電所是電力系統(tǒng)的一個重要組成部分，由電氣設(shè)備及配電網(wǎng)絡(luò)按一定的接線方式所構(gòu)成，它從電力系統(tǒng)取得電能，通過其變換、分配、輸送與保護(hù)等功能，將電能安全、可靠、經(jīng)濟的輸送到每一個用電場所 首先進(jìn)行負(fù)荷的分析計算和無功補償，負(fù)荷計算采用需要系數(shù)法，接下來 進(jìn)行電氣主接線的分析設(shè)計，根據(jù)變壓器臺數(shù) 2 臺、 110kV側(cè)采用 單母線分段接線 ，35kV 側(cè)采用單母線分段接線，根據(jù)主接線圖確定選取三 個短路點并采用標(biāo)幺值法進(jìn)行短路計算，計算出短路電流周期分量有效值、短路沖擊電流最大值和有效值 .二次回路方案的確定及繼電器保護(hù)的選擇和整定 ， 防雷保護(hù)與接地裝置的設(shè)計 ， 在防雷設(shè)計部分中對于直擊雷采用四根獨立的避雷針， 并計算出了避雷針的高度 ， 對于感應(yīng)雷采用氧化鋅避雷器。 關(guān)鍵詞 ：主變壓器；電氣主接線；短路計算 遼寧科技學(xué)院本科生畢業(yè)設(shè)計 第 II頁 Buck 110KV electrical substation and a part of the design of lightning protection Abstract With the development and progress of modern civilization, put forward higher request of social production and life to the quality of power supply and management, as a middle pivot of power transmission and control, must change the traditional design and control mode of substation, to adapt to the development trend of modern power system, the modernization of industrial production and social life, substation is an important part of power system, the electrical equipment and distribution work at a certain wiring posed, it obtains the electric power from the electric power system, through its transformation, distribution, transportation and protection functions, the electricity safety, reliability, economy to each one electric field. First carries on the analysis putation load and non power pensation, load the required coefficient method, analysis and design the next main electrical wiring, according to transformer number 2, voltage grade, line 2 and line 6 back, side 110kV with the single bus, 35kV side using the single bus, according to the main wiring diagram select three short points and the normalized value of short circuit calculation, calculate the periodic ponent of shortcircuit current effective value, shortcircuit current maximum value and the value. Two determine the circuit scheme and selection of relay protection and setting, the design of lightning protection and earthing device, in part for the lightning protection design lightning strike by four independent lightning rod, for the Zinc Oxide induction lightning arrester, and calculate the lightning rod height. Key words： substation； transformer； main wiring； short circuit calculation 遼寧科技學(xué)院本科生畢業(yè)設(shè)計 第 III頁 目 錄 1. 緒論 ......................................................................................................................... 1 . 變電所的發(fā)展情況 .......................................................................................... 1 . 設(shè)計背景及主要內(nèi)容 ...................................................................................... 2 . 環(huán)境條件 ................................................................................................... 2 . 電力系統(tǒng)情況 ........................................................................................... 2 . 設(shè)計任務(wù) ................................................................................................... 3 2. 電氣主接線的設(shè)計 ................................................................................................. 4 . 電氣主接線概述 .............................................................................................. 4 . 在選擇電氣主接線時的依據(jù) .......................................................................... 4 . 變電站主接線設(shè)計的基本要求 ...................................................................... 4 . 110KV側(cè)主接線方案 ...................................................................................... 5 . 35KV側(cè)主接線的設(shè)計 ................................................................................... 6 . 變電所主接線圖 .............................................................................................. 6 3. 負(fù)荷計算及其無功補償 ......................................................................................... 7 . 負(fù)荷分析計算 .................................................................................................. 7 . 35KV側(cè)負(fù)荷計算 ........................................................................................... 7 . 無功補償 .......................................................................................................... 8 . 無功補償?shù)母攀?....................................................................................... 8 . 無功補償裝置 ........................................................................................... 8 . 無功補償?shù)挠嬎?....................................................................................... 8 . 確定并聯(lián)電容的個數(shù) ............................................................................... 9 4. 變壓器的選擇 ....................................................................................................... 10 . 變壓器的概述 ................................................................................................ 10 . 變壓器臺數(shù)和容量的確定原則 .................................................................... 10 . 變壓器的形式和結(jié)構(gòu)的選擇原則 ................................................................ 11 5. 短路電流的計算 ................................................................................................... 13 . 短路電流計算的目的 .................................................................................... 13 . 短路電流計算的一般規(guī)定 ............................................................................ 13 遼寧科技學(xué)院本科生畢業(yè)設(shè)計 第 IV頁 . 短路電流的計算 ............................................................................................ 13 6. 主要電氣設(shè)備的選擇 ........................................................................................... 20 . 電氣設(shè)備選擇的一般條件。 ........................................................................ 20 . 110KV側(cè)斷路器隔離開關(guān)的選擇 ............................................................... 21 . 進(jìn)線側(cè)斷路器 ............