【正文】 河南理工大學(xué)萬方科技學(xué)院畢業(yè)設(shè)計(jì)I摘 要電能是現(xiàn)代工業(yè)生產(chǎn)的主要能源和動(dòng)力。電能既易于由其它形式的能量轉(zhuǎn)換而來，又易于轉(zhuǎn)換為其它形式的能量以供應(yīng)用；電能的輸送和分配既簡單經(jīng)濟(jì)，又便于控制、調(diào)節(jié)和測(cè)量，有利于實(shí)現(xiàn)生產(chǎn)過程自動(dòng)化。隨著電能在生活中的廣泛應(yīng)用，對(duì)電力系統(tǒng)的穩(wěn)定、經(jīng)濟(jì)、可靠要求就有所增加，作為生產(chǎn)電能的發(fā)電廠一次系統(tǒng)的設(shè)計(jì)就顯得尤其的重要。本文設(shè)計(jì)了某 4220MW 火力發(fā)電廠的一次系統(tǒng)，是從我國電力系統(tǒng)整體出發(fā)，根據(jù)系統(tǒng)設(shè)計(jì)的主要任務(wù)，發(fā)電廠和變電所電能的生產(chǎn)、變壓、輸送、分配和使用的安全、優(yōu)質(zhì)、可靠以及經(jīng)濟(jì)運(yùn)行的要求，提出一次系統(tǒng)的具體設(shè)計(jì)方案。主要設(shè)計(jì)內(nèi)容為主接線形式的確定、主變壓器的選擇；進(jìn)行了短路電流計(jì)算，對(duì)主要電氣設(shè)備進(jìn)行了選擇和校驗(yàn)，包括母線、斷路器、隔離開關(guān)、互感器、避雷器等。通過畢業(yè)設(shè)計(jì)鞏固了所學(xué)專業(yè)知識(shí)，使自己對(duì)發(fā)電廠一次系統(tǒng)有了整體的認(rèn)識(shí)。關(guān)鍵詞： 一次系統(tǒng)；主接線；短路計(jì)算；設(shè)備選擇 河南理工大學(xué)萬方科技學(xué)院畢業(yè)設(shè)計(jì)IIAbstractElectricity is modern industrial production of the main sources of energy and motive force. Electricity is easily by other forms of energy conversion, and easy to convert to other forms of energy supply, Electric power transmission and distribution is simple and easy control, economic regulation and measurement, conducive to the realization of automatic production process. With the wide application of power in the life of the power system, stable and reliable, economic increase, as for the production of electric power system design appears especially important. This paper designs a 4 x 220MW coalfired power plants in China, is a system of power system, according to the main task of system design, the production of electric power plant and substation, pressure, transmission, distribution and use of safety, high quality, reliable and economical operation of the system, a design scheme. Main design content determination of form, mainly wiring the choice of main transformer, The shortcircuit current calculation of main electrical equipment, the choice and calibration, including generatrix, circuit breakers, isolating switch, transformer, arresters, etc. Through the graduation design professional knowledge, and strengthened himself in a power system.Key words: primary system。 main connection line。 shortcircuit calculation。 equipment choice 河南理工大學(xué)萬方科技學(xué)院畢業(yè)設(shè)計(jì)目 錄前 言 ..................................................................................................11 概述 ..................................................................................................2 原始資料 ..........................................................................................2 本課題的研究任務(wù) ..........................................................................32 電氣主接線 .......................................................................................4 電氣主接線 ......................................................................................4 主接線的設(shè)計(jì)依據(jù) ...............................................................4 設(shè)計(jì)要求 ...............................................................................5 電氣主接線方式的比較 ..................................................................6 擬采用的主接線方式的比較 ...............................................6 結(jié)論 .......................................................................................7 主變壓器臺(tái)數(shù)和容量選擇 ..............................................................7 具有發(fā)電機(jī)電壓母線的主變壓器 .......................................7 單元接線的主變壓器 ...........................................................8 主變壓器型式的選擇 ...........................................................8 繞組數(shù)量和連接方式的選擇 ...............................................9 主變壓器選擇結(jié)果 ...............................................................93 短路電流計(jì)算 .................................................................................10 短路的一般概念 ............................................................................10 短路形成的原因 .................................................................10 短路電流計(jì)算的目的 .........................................................10 短路電流計(jì)算原則 ........................................................................11 短路電流計(jì)算的基本條件 .................................................11 接線方式 .............................................................................11 計(jì)算容量 .............................................................................12 短路種類 .............................................................................12 短路計(jì)算點(diǎn) .........................................................................12 三相短路的計(jì)算方法 .........................................................12 各個(gè)短路點(diǎn)進(jìn)行具體分析 .................................................144 電氣設(shè)備選擇 ..................................................................................15 一般原則及技術(shù)條件 ....................................................................15 設(shè)計(jì)規(guī)程對(duì)于設(shè)備選擇的規(guī)定 .........................................15 原則 .....................................................................................15 按正常工作條件選擇設(shè)備 .................................................16河南理工大學(xué)萬方科技學(xué)院畢業(yè)設(shè)計(jì)i 按正常工作電壓選擇設(shè)備額定電壓 .................................16 按工作電流選擇設(shè)備額定電流 .........................................17 按短路條件校驗(yàn)設(shè)備的動(dòng)穩(wěn)定和熱穩(wěn)定 .........................17 母線的選擇 ....................................................................................18 簡介 .....................................................................................18 母線的材料 .........................................................................19 母線截面選擇 .....................................................................19 母線的熱穩(wěn)定校驗(yàn) .............................................................20 母 線的動(dòng)穩(wěn)定校驗(yàn) .............................................................21 母線電暈校驗(yàn) .....................................................................23 母線選擇結(jié)果 .....................................................................23 斷路器的選擇 ................................................................................23 斷路器的 選擇原則 .............................................................23 選擇類型 .............................................................................24 選擇額定電壓 .....................................................................24 選擇額定電流 .....................................................................24 校驗(yàn)開斷能力 .................................