【正文】 河南理工大學畢業(yè)設(shè)計（論文）說明書 摘 要 牽引供電系統(tǒng)作為我國鐵路電氣化的重要組成部分，在地鐵系統(tǒng)中起到動力供應(yīng)、照明、通信等關(guān)鍵性的作用。牽引供電系統(tǒng)由牽引降壓變電所、接觸網(wǎng)、環(huán)網(wǎng)等部分組成。本次設(shè)計主要對牽引降壓混合變電所的一次部分進行研究和設(shè)計。本設(shè)計以在蘇州建造地鐵牽引降壓混合變電所的實習資料作為參考，通過對擬建變電所的負荷參數(shù)和線路系統(tǒng)等方向考慮，并通過對負荷資料的分析和安全、經(jīng)濟、可靠性的考慮，確定了變電所的電氣主接線和所用電的主接線，然后通過負荷計算和供電區(qū)間確定了主變壓器的臺數(shù)、容量及型號。根據(jù)最大持續(xù)電流及短路計算的計算 結(jié)果，對斷路器、隔離開關(guān)、高壓熔斷器、母線、絕緣子、電壓互感器、電流互感器等分別進行了選型和數(shù)量匯總。然后是對牽引降壓混合變電所的接地系統(tǒng)、防雷系統(tǒng)和繼電保護整定設(shè)計。最后是對擬建變電所的平面布置設(shè)計，從而完成了本次設(shè)計。 關(guān)鍵詞： 牽引供電 變電所 電氣主接線 變壓器 河南理工大學畢業(yè)設(shè)計（論文）說明書 Abstract Power transformation and distribution system in subway provides all loads electric energy except electric train, has the very important functions to subway’s normal operation. Under the background of accelerating construction of subway’s engineering for resolving the mass transit problems in our country, the research on project design of power transformation and distribution system in subway is very important. The thesis studies the problem of subway’s load calculation, gives out suggestionvalues of subway39。s unit target and demand factor for load calculation of subway’spower transformation and distribution system, analyzes and putes the problemsbining with an example. Secondly, this thesis thoroughly studies the characteristics of subway’s power transformation and distribution system, produces the overall power distribution plan of actual project. Based on the characteristics of subway’s power transformation and distribution system and external power plan in city, this article analyzes the functions and formations of the mediumvoltage power distribution work and the substation, gives three kinds design plans respectively. After then, the thesis explains loads division as well as power supply request, discusses the principles of power distribution system design, design of distribution line, choices of low voltage electric appliance and the application of microputer protective device of electric motors. Keyword: distribution substation Power transformation河南理工大學畢業(yè)設(shè)計（論文）說明書 目 錄 1 緒論 ............................................................................................................................ 1 課題的目的和意義 ......................................................................................... 1 國內(nèi)外研究現(xiàn)狀 ............................................................................................. 1 牽引降壓混合變電所 ..................................................................................... 2 牽引變電所 .......................................................................................... 2 降壓變電所 .......................................................................................... 4 設(shè)計任務(wù) ......................................................................................................... 6 2 變電所的設(shè)計方案 .................................................................................................... 7 設(shè)計方案概述 ................................................................................................. 7 設(shè)計方案選擇 ................................................................................................. 7 牽引 — 降壓獨立配電網(wǎng)絡(luò) .................................................................. 7 牽引 — 降壓混合配電網(wǎng)絡(luò) .................................................................. 8 本章小結(jié) ......................................................................................................... 9 3 負荷計算 .................................................................................................................. 10 地鐵負荷分類 ............................................................................................... 10 地鐵負荷計算方法 ....................................................................................... 10 單位指標法 ........................................................................................ 11 需要系數(shù)法 ........................................................................................ 11 二項式系數(shù)法 .................................................................................... 12 地鐵變配電負荷計算 ................................................................................... 13 動力負荷 ............................................................................................ 13 照明負荷 ............................................................................................ 16 綜合計算負荷 .................................................................................... 17 無功功率補償 .................................................................................... 18 本章小結(jié) ....................................................................................................... 19 4 變壓器的選擇 .......................................................................................................... 20 5 變電所主接線設(shè)計 .................................................................................................. 22 6 短路計算 .................................................................................................................. 24 短路計算的必要性 ....................................................................................... 24 短路計算 ....................................................................................................... 25 河南理工大學畢業(yè)設(shè)計（論文）說明書 變壓器等值電抗計 算 ........................................................................ 25 短路點的選擇 .................................................................................... 26 7 電氣設(shè)備的選擇 ...................................................................................................... 28 配電線路的選擇 ........................................................................................... 28 斷路器的選擇 ............................................................................................... 30 高壓側(cè)斷路器的選取 ........................................................................ 30 低壓側(cè)斷路器的選取 ........................................................................ 31 隔離開關(guān)的選擇