【正文】 y for the development of the wiring design, taking into account the shortcircuit serious impact on the system design of a shortcircuit basis. Design of the main high voltage electrical equipment on the choices and calculations, such as circuit breakers, isolation switches, voltage transformer, current transformer. In addition, the design and calculation of mineprotected and enhanced the security of the entire substations. Key words: 35KV, Substation, Overall design 35KV 變電站總體設(shè)計(jì) III 目 錄 1 變電站站址的選擇原則和作用 ................................................................................... 1 變電站的選擇 原則 ........................................................................................... 1 變電所在電力系統(tǒng)的地位 ................................................................................ 2 電力系統(tǒng)供電要求 .......................................................................................... 2 電力系統(tǒng)運(yùn)行的特點(diǎn) ....................................................................................... 3 電力系統(tǒng)的額定電壓 ....................................................................................... 3 2 主接線設(shè)計(jì) ............................................................................................................... 4 對電氣主接線的基本要求 ................................................................................ 4 所要選擇的主接線形式 ................................................................................... 4 3 負(fù)荷計(jì)算 .................................................................................................................. 5 計(jì)算負(fù)荷 ......................................................................................................... 6 4 變電站主變壓器的選擇 ............................................................................................. 7 繞組數(shù)量和連接方式的確定 ............................................................................ 7 主變阻抗及調(diào)壓方式選擇 ................................................................................ 7 電容電流的計(jì)算 .............................................................................................. 8 變壓器中性點(diǎn)接地方式和中性點(diǎn)設(shè)計(jì) ............................................................ 8 主變?nèi)萘窟x擇原則 .......................................................................................... 9 5 短路電流的計(jì)算 ...................................................................................................... 10 計(jì)算短路電流的意義 ..................................................................................... 10 短路電流計(jì)算的規(guī)定 ...................................................................................... 11 本次設(shè)計(jì)中短路電流的計(jì)算 ......................................................................... 11 6 高壓電器設(shè)備的選擇 ............................................................................................... 14 電器設(shè)備選擇的一般原則 .............................................................................. 15 高壓斷路器 的選擇原則 .................................................................................. 15 各電壓等級側(cè)斷路器的選擇 ........................................................................ 17 隔離開關(guān)的選擇 .......................................................................................... 18 電壓互感器和電流 互感器的選擇 ................................................................... 20 電抗器的選擇 ............................................................................................... 21 高壓熔斷器的選擇 ........................................................................................ 22 7 變電站的防雷保護(hù) ....................................