【正文】 nt to feels with each other the machine, electric voltage feels with each other the choice principle of the machine, high pressure switch cabi with request, and proceed to these equipments the school check with the related introduction in product. The calculation book include： Short circuit electric current puting, is the most important link, this book introducing calculating purpose, term, general provision, dollar in shortcircuit electric current a parameter transformation etc. Key wordssubstation, electric engineering, design 湯屯 一次降壓變電所電氣部分初步設(shè)計(jì) 目錄 摘要 .................................................................................................................................................. I ABSTRACT ........................................................................................................................................ II 引言 ................................................................................................................................................. 1 第一部分說明書 ............................................................................................................................. 2 1 主變壓器的選擇 .......................................................................................................................... 2 主變壓器的選擇 ................................................................................................................... 2 選擇主變壓器的原則 ........................................................................................................... 2 主變壓器臺(tái)數(shù)的確定 .................................................................................................... 2 主變壓器型式的選擇 .................................................................................................... 3 主變壓器容量的確定 ..................................................................................................... 3 2 電氣主接線的選擇 ..................................................................................................................... 4 電氣主接線的設(shè)計(jì) ............................................................................................................... 4 電氣主接線的基本要求 ................................................................................................ 4 變電所主接線的選擇 ........................................................................................................... 5 主接線方案 ........................................................................................................................... 6 主接線方案的初步確定 ................................................................................................ 6 方案分析 ........................................................................................................................ 6 3 短路 電流計(jì)算 ............................................................................................................................ 12 短路電流計(jì)算的目的 ......................................................................................................... 12 短路電流計(jì)算的一般規(guī)定 ................................................................................................. 12 基本假定 ............................................................................................................................. 12 三相短路電流計(jì)算 ............................................................................................................. 13 等值網(wǎng)絡(luò)的繪制 .......................................................................................................... 13 化簡(jiǎn)等值網(wǎng)絡(luò) .............................................................................................................. 13 三相短路電流周期分量任意時(shí)刻的計(jì)算 .................................................................. 13 限流措施 ............................................................................................................................. 14 電力系統(tǒng)可以采取的限流措施 .................................................................................. 14 發(fā)電廠和變電所中可以采取的限流措施 .................................................................. 14 規(guī)定說明 ............................................................................................................................. 15 短路計(jì)算點(diǎn)的選擇 ............................................................................................................. 15 三相短路電流沖擊值的計(jì)算 ............................................................................................. 15 4 變電所電氣設(shè)備選擇 ............................................................................................................... 17 電氣設(shè)備的選擇原則 ......................................................................................................... 17 電氣設(shè)備選擇的一般要求 .......................................................................................... 17 電氣設(shè)備選擇的一般原則 .......................................................................................... 17 電氣設(shè)備的選擇 ................................................................................................................. 19 高壓斷路器的選擇 ...................................................................................................... 19 隔離開關(guān)的選擇 .......................................................................................................... 20 電流互感器的選擇 ...................................................................................................... 20 沈陽工程學(xué)院畢業(yè)設(shè)計(jì) 電壓互感器的選擇 ...................................................................................................... 22 互感器的配置要求 .................................................................................................... 22 母線的選擇 ......................................................................................................................... 23 軟母線的選擇 .............................................................................................................. 23 避雷器的選擇 .....