【正文】 洛陽(yáng)理工學(xué)院畢業(yè)設(shè)計(jì)（論文） I 畢業(yè)設(shè)計(jì)（論文） 110kV 變電站的初步設(shè)計(jì) 摘 要 根據(jù)對(duì)原始資料背景和設(shè)計(jì)要求的分析， 110kV 變電站初步設(shè)計(jì)的主要內(nèi)容包括：先試選電氣主接線方案，然后進(jìn)行技術(shù)性和經(jīng)濟(jì)性的比較，最終選擇最合理的主接線形式；通過(guò)經(jīng)濟(jì)截面電流法，先選擇變電所進(jìn)線導(dǎo)線，為后續(xù)三相短路電流計(jì)算做鋪墊；根據(jù)三相短路電流計(jì)算結(jié)果，選擇符合使用要求的各種電氣設(shè)備；最終是對(duì)變壓器、線路進(jìn)行保護(hù)。 通過(guò)綜合分析， 110kV 側(cè)入線是雙電源供電， 35kV 和 10kV 母線選擇的都是單母線接線。導(dǎo)線選擇后，采用標(biāo)幺值法計(jì)算等效電抗，通過(guò)查電源 運(yùn)算曲線的圖表，找出短路瞬間、 4s 后的短路電流標(biāo)幺值，而后將其轉(zhuǎn)換成有名值，通過(guò)公式計(jì)算出沖擊電流。至于電氣設(shè)備的選擇則是通過(guò)最大負(fù)荷電流和開(kāi)斷電流進(jìn)行選擇，根據(jù) 4s 后電流有名值和短路沖擊電流有名值進(jìn)行熱穩(wěn)定性和動(dòng)穩(wěn)定性校驗(yàn)；至于保護(hù)方面，主要是變壓器的保護(hù)，通過(guò)延時(shí)時(shí)間不同，來(lái)讓不同斷路器動(dòng)作，進(jìn)而起到保護(hù)作用。 關(guān)鍵詞 ：電氣主接線，三相短路電流，變壓器，線路保護(hù)，標(biāo)幺值 洛陽(yáng)理工學(xué)院畢業(yè)設(shè)計(jì)（論文） II PRELIMINARY DESIGN OF 110 kV SUBSTATION ABSTRACT According to the analysis of raw data background and design requirements, the main content of the preliminary design of the 110 kV substation including: Try to choose the main electrical wiring scheme, then carries on the technical and economical parison, and finally choose the most appropriate form of the main wiring. Through the economical section current method, choose the substation into line conductor, which will pave for the subsequent threephase shortcircuit current calculation. According to the results of the threephase shortcircuit current calculation to choose all kinds of electrical equipment, which conform to the requirements. Transformer and line are ultimately to be protected. Through the prehensive analyse, the side into line of 110 kV is double power supply, while 35 kV and 10 kV busbar selection are single busbar wiring. Use standard per unit method to calculate the equivalent reactance after selecting wire, and to find out the per unit39。s shortcircuit current value of short circuit instantaneous and after 4s’ through checking the power operation curve chart, and then convert them into actual value, calculate the shock current based on the formula. As for the selection of electrical equipment, which is through the choice of maximum load current and open circuit current, carries on the thermal stability and dynamic stability check according to the after 4s’ current actual value and short circuit impact current actual value. The protection of transformer is mainly in protection, which protects further through the different delay time to make the different circuit breaker action. KEY WORDS: main electrical wiring, threephase shortcircuit current, transformer, line protection, per unit 洛陽(yáng)理工學(xué)院畢業(yè)設(shè)計(jì)（論文） III 目 錄 前 言 ....................................................................................................... 1 第 1 章 原始資料分析及變壓器的選擇 ............................................... 2 原始資料簡(jiǎn)介及分析 ............................................................... 2 原始資料簡(jiǎn)介 ................................................................. 2 原始資料分析 ................................................................. 2 變壓器的選擇 ............................................................................ 3 變壓器數(shù)量的選擇 ......................................................... 3 變壓器容量的選擇 ......................................................... 3 第 2 章 電氣主接線的設(shè)計(jì) .................................................................... 5 電氣主接線 ................................................................................ 5 電氣主接線的基本要求 ................................................. 5 母線制 ........................................................................................ 5 單母線接線 ...................................................................... 5 單母線分段接線 ............................................................. 6 雙母線接線 ...................................................................... 7 橋形接線 .......................................................................... 7 電氣 主接線設(shè)計(jì)方案的比較及選擇 ....................................... 7 第 3 章 短路電流的計(jì)算 ........................................................................ 9 概述 ............................................................................................ 9 短路類型 .......................................................................... 9 短路計(jì)算步驟 ................................................................. 9 變電站電源進(jìn)線的選擇 ........................................................... 9 變電站容量補(bǔ)償后的初步估計(jì) .................................... 9 變電站進(jìn)線的選擇 ....................................................... 10 短路計(jì)算 ................................................................................... 10 各元件電抗標(biāo)幺值的計(jì)算 ............................................11 K1 點(diǎn)（ 35kV 母線）短路電流計(jì)算 ............................ 13 K2 點(diǎn)（ 10kV 母線）短路電流計(jì)算 ............................ 16 洛陽(yáng)理工學(xué)院畢業(yè)設(shè)計(jì)（論文） IV K3 點(diǎn)（ 110kV 母線）短路電流計(jì)算 .......................... 19 K4 點(diǎn)（ 110kV 母線）短路電流計(jì)算 .......................... 21 短路電流計(jì)算總結(jié) .................................................................. 22 第 4 章 變電所電氣設(shè)備的選擇及校驗(yàn) ............................................. 23 斷路器和隔離開(kāi)關(guān)的選擇與校驗(yàn) ......................................... 23 斷路器的選擇 ............................................................... 23 斷路器的校驗(yàn) ............................................................... 24 隔離開(kāi)關(guān)的選擇 ........................................................... 24 隔離開(kāi)關(guān)的校驗(yàn) ........................................................... 25 電壓互感器的選擇 .................................................................. 26 電壓互感器 .................................................................... 26 電壓互感器的選擇 ....................................................... 27 電流互感器的選擇 .................................................................. 28 電流互感器的特點(diǎn) ....................................................... 28 電流互感器的選擇及校驗(yàn) ........................................... 29 各電壓側(cè)電流互感器的選擇及校驗(yàn) .......................... 30 母線的選擇 .............................................................................. 32 母線 .......................................