【正文】 本科生畢業(yè)設(shè)計(jì)（論文） 摘 要 本畢業(yè)設(shè)計(jì)是對發(fā)電廠廠用電進(jìn)行設(shè)計(jì)，主要運(yùn)用發(fā)電廠電氣部分、高電壓技術(shù)、電力系統(tǒng)分析、電力系統(tǒng)自動(dòng)化、電力系統(tǒng)繼電保護(hù)等專業(yè)知識完成“發(fā)電廠廠用電的設(shè)計(jì)”，具體設(shè)計(jì)內(nèi)容包括廠用電 接 線設(shè)計(jì)、負(fù)荷分析計(jì)算、變壓器選擇、電動(dòng)機(jī)自啟動(dòng)校驗(yàn)，繼電保護(hù)設(shè)計(jì)、配電裝置設(shè)計(jì)、防雷設(shè)計(jì)、繪制廠用電接線圖、繼電保護(hù)二次回路接線圖、繪制配電裝置圖。本設(shè)計(jì)嚴(yán)格遵循發(fā)電廠電氣部分的設(shè)計(jì)原則，并結(jié)合實(shí)際情況確定了廠用電母線電壓等級確定為 6KV， 利用換算系數(shù)法進(jìn)行負(fù)荷分析計(jì)算， 變壓器選擇 低壓分裂 三 繞組 變壓器，確定了合適的短路點(diǎn)進(jìn) 行短路電流計(jì)算。根據(jù) 防雷保護(hù)要求 確定避雷器；最后繪制了相關(guān)的圖紙。 關(guān)鍵詞 ：發(fā)電廠； 變壓器 ；繼電保護(hù)；避雷器 本科生畢業(yè)設(shè)計(jì)（論文） II ABSTRACT The text is designed towards the electricity power plant, using electrical power plants, highvoltage technology, power system analysis, power system automation, power system protection, and other expertise to plete, “Power Plant power of design” mainly. Specific design elements including electricity cable plant design, load analysis, the choice of transformers, motors start checking, protection design, distribution design, mine design, drawing electricity plant wiring diagram, the second circuit protection wiring diagram, mapping distribution setup. The design follows strickly to the design principles of the electrical power plants, bined with the actual situation identifying the bus voltage electricity plant as 6 KV, using conversion factor method to calculate the load, transformer chooses the lowvoltage winding. Fix the appropriate shortcircuit point to calculate the shortcircuit current. Key word: power plant。 transformer。 relay protection。 arrester 本科生畢業(yè)設(shè)計(jì)（論文） 目 錄 0 前 言 ...........................................................................................................................................1 1 廠用電電壓等級確定及接線設(shè)計(jì) .............................................................................................2 廠用電 的電壓等級確定 ..........................................................................................2 廠用電接線設(shè)計(jì) ......................................................................................................2 2 廠用電負(fù)荷計(jì)算及變壓器選擇 .................................................................................................4 廠用電負(fù)荷的計(jì)算原則 ..........................................................................................4 廠用負(fù)荷的計(jì)算方法 ...............................................................................................6 換算系數(shù)法 ...................................................................................................6 電動(dòng)機(jī)計(jì)算功率確定 ...................................................................................6 廠用變壓器的選擇 ................................................................................................10 額定電壓 .....................................................................................................10 廠用變壓器的容量 .....................................................................................10 3 電動(dòng)機(jī)的 自啟動(dòng)校驗(yàn) ...............................................................................................................14 電動(dòng)機(jī)自啟動(dòng)校驗(yàn)定義 ........................................................................................14 電動(dòng)機(jī)自啟動(dòng)分類 ................................................................................................14 電動(dòng)機(jī)自啟動(dòng)校驗(yàn) ................................................................................................16 電壓校驗(yàn) .....................................................................................................16 電動(dòng)機(jī)自啟動(dòng)母線電壓校驗(yàn) .....................................................................18 4 短路計(jì)算及電氣設(shè)備選擇 .......................................................................................................23 短路計(jì)算的目的及意義 ........................................................................................23 短路計(jì)算 ................................................................................................................24 電氣設(shè)備選擇的要求和原則 ................................................................................25 校驗(yàn)的原則及熱穩(wěn)定條件 ....................................................................................26 環(huán)境條件 ................................................................................................................27 電氣設(shè)備的選擇 ....................................................................................................28 斷路器參數(shù)的選擇 .....................................................................................28 隔離開關(guān)參數(shù)的選擇 .................................................................................28 形式選擇 .....................................................................................................28 電流互感器的選擇 .....................................................................................30 本科生畢業(yè)設(shè)計(jì)（論文） IV 電壓互感器的選擇 .....................................................................................31 母線的選擇 ............................................................................................................31 母線材料、形 式、和布置方式的選擇 .....................................................31 母線選擇計(jì)算 .............................................................................................32 5 繼電保護(hù)總體方案 ...................................................................................................................34 主變壓器保護(hù)規(guī)劃 ................................................................................................34 變壓器保護(hù) ............................................................................................................35 母線保護(hù) ................................................................................................................35 廠用母線保護(hù)應(yīng)滿足的要求 ................................................................................36 廠用母線保護(hù)的選擇 ............................................................................................36 6 配電裝置 ...................................................................................................................................37 7 防雷保護(hù)設(shè)計(jì) .....................................................................................