【正文】 I，可以方便、高效地轉(zhuǎn)換成其它能源形式。當(dāng)今，火力發(fā)電在我國乃至全世 界范圍，其裝機(jī)容量占總裝機(jī)容量的 70％左右，發(fā)電量占總發(fā)電量的 80％左右。由此可見，電能在我國這個發(fā)展中國家的國民經(jīng)濟(jì)中擔(dān)任著主力軍的作用。 設(shè)計中將主要從理論上在電氣主接線設(shè)計，短路電流計算，電氣設(shè)備的選擇，配電裝置的布局，防雷設(shè)計，發(fā)電機(jī)、變壓器和母線的繼電保護(hù)等方面做詳盡的論述，并與三河火力發(fā)電廠現(xiàn)行運(yùn)行情況比較，同時，在保證設(shè)計可靠性的前提下，還要兼顧經(jīng)濟(jì)性和靈活性，通過計算論證該火電廠實際設(shè)計的合理性與經(jīng)濟(jì)性。在計算和論證的過程中，結(jié)合新編電氣工程手冊規(guī)范，采用 CAD 軟件繪制了大量電氣圖，進(jìn)一步完 善了設(shè)計。 關(guān)鍵詞 ： 主接線設(shè)計，短路電流，配電裝置，電氣設(shè)備選擇，繼電保護(hù) II Abstract Electricity is the most important energy of economic development which can be conveniently and efficiently converted into other forms of energy. Today,not only in China but also in the world ,the thermoelectricity capacity accounts to about 70% and the power about 80%.So, electricity plays an important role in our country which is a developing country. In this design, I will mainly discuss main electric connection design, short circuit account, electric equipment choice, electric equipment layout, lightning strike defending design, electrical machine, transformer and generatrix protective relaying detailedly in theory and paring with the power plant of San he, while ensuring the reliability of the design, under the premise we should also take into account economic and flexibility demonstrated by calculating the effective thermal power plant design and reasonable my counting and demonstrating,in order to consummate my design, I will protract a great lot of electric engineeringpictures by AutoCAD following the new criterion of electric engineeringenchiridion. Keywords： main electric connection design ,short current, electric equipment choice, electric equipment layout,protective relaying III 目 錄 摘 要 ............................................................................................................................ I Abstract ........................................................................................................................ II 1 緒 論 ........................................................................................................................ 1 課題背景 ................................................................................................................. 1 社會背景 .............................................................................................................. 1 專業(yè)學(xué)習(xí)背景 ....................................................................................................... 1 課題研究的目的和意義 ........................................................................................ 1 國內(nèi)外研究現(xiàn)狀 .................................................................................................... 2 電力系統(tǒng)的國內(nèi)外發(fā)展概況 ............................................................................. 2 火電廠設(shè)計研究的國內(nèi)外發(fā)展概況 ................................................................. 3 課題的主要研究工作 ............................................................................................ 3 設(shè)計內(nèi)容 ............................................................................................................ 3 擬解決的關(guān)鍵問題 .............................................................................................. 3 2 電氣主接線設(shè)計 ........................................................................................................ 4 明確任務(wù)和設(shè)計原理 ............................................................................................ 4 原始資料 ............................................................................................................... 4 原始資料的分析 ................................................................................................... 4 方案的設(shè)計、論證和選 擇 ..................................................................................... 5 方案設(shè)計 .............................................................................................................. 5 方案的經(jīng)濟(jì)比較 ................................................................................................. 6 本章小結(jié) ................................................................................................................. 7 3 短路電流的計算 ........................................................................................................ 8 短路的原因、后果及其形式 ................................................................................ 8 短路的物理過程及計算方法 ................................................................................. 8 短路電流的計算數(shù)據(jù)和計算結(jié)果 ....................................................................... 10 500KV 三相短路電流電流計算及其正序阻抗圖 ........................................... 10 500KV 電氣主接線及其設(shè)備規(guī)范 ................................................................... 11 短路電流的詳細(xì)計算結(jié)果見附錄 ................................................................... 11 4 電氣設(shè)備的選擇 ...................................................................................................... 12 主變壓器和發(fā)電機(jī)的選擇 .................................................................................. 12 發(fā)電機(jī)的選擇 ..................................................................................................... 12 主變壓器的選擇 ................................................................................................. 12 高低壓電器設(shè)備的選擇 ...........................