【正文】 he reliability of power supply. Followed by the main electrical scheme, presented in several different designs, economy, reliability and sensitivity analysis, and ultimately determine the high and low pressure side of the Single Bus wiring program. Select the number of transformer units and capacity in order to improve the reliability of substation power supply, using the two models of the same transformer. Shortcircuit calculation used the more mon standard value method. For the choice of devices can be divided into the high pressure side(35kV side) and lowvoltage side(10kV side). According to different requirements to see if the need for dynamic stability or thermal stability of calibration, select the more suitable equipment and cables, bus, circuit breakers, isolating switches, and the low voltage side of the 10kV installed reactive power pensation device. Next is the protection of the transformer, for oilimmersed transformer gas protection, the current speed off, over current, and these types of overload protection can be used. After the final analysis, the use of a lightning rod 4 as part of the electrical substation lightning protection. Keywords Substation； Main electrical scheme； Shortcircuit current； Electrical equipment III 目 錄 摘要 ....................................................................................................................... I Abstract ................................................................................................................ II 第 1 章 緒論 .........................................................................................................1 課題背景 ................................................................................................1 工程概述 ................................................................................................2 變電所的負(fù)荷情況 ................................................................................3 選題的目的和意義 ................................................................................3 研究主要內(nèi)容 ........................................................................................3 第 2 章 電氣主接線方案的確定 .........................................................................4 主接線設(shè)計(jì)依據(jù) ....................................................................................4 主接線的基本接 線形式 ........................................................................4 變電站 35KV 側(cè)接線形式的確定 .........................................................5 35kV 側(cè)的幾種接線方案 ................................................................5 35kV 側(cè)的接線方 案分析比較 ........................................................7 變電站 10KV 側(cè)接線形式的確定 .........................................................8 變電站 側(cè)接線形式的確定 ........................................................9 本章小結(jié) ................................................................................................9 第 3 章 變壓器的選擇 .......................................................................................10 變電所主變壓器臺數(shù)的選擇 ..............................................................10 變電所主變壓器容量的選擇 ..............................................................10 主變壓器型式的選擇 .......................................................................... 11 廠用低壓側(cè)變壓器的選擇 ..................................................................13 本章小結(jié) ..............................................................................................13 第 4 章 短路電流的計(jì)算 ...................................................................................14 短路電流的原因和后果 ......................................................................14 短路電流計(jì)算的目的 ..........................................................................15 短路電流計(jì)算 ......................................................................................15 繪制短路電流計(jì)算電路圖 ...........................................................15 IV 確定基準(zhǔn)值 ................................................................................... 16 計(jì)算短路電路中各個(gè)元件電抗標(biāo)幺值 ....................................... 16 母線短路點(diǎn)的短路計(jì)算 ............................................................... 17 計(jì)算結(jié)果匯總 ...................................................................................... 19 本章小結(jié) .............................................................................................. 19 第 5 章 電氣設(shè)備的選擇 ................................................................................... 20 導(dǎo)體和電氣設(shè)備選擇的一般條件 ...................................................... 20 一般原 則 ....................................................................................... 20 技術(shù)條件 ....................................................................................... 20 斷路器的選擇 ...................................................................................... 21 35kV 側(cè)斷路器選擇 ...................................................................... 22 10kV 側(cè)斷路器選擇 ...................................................................... 23 隔離開關(guān)的選擇 .................................................................................. 24 35kV 側(cè)隔離開關(guān)選擇 .................................................................. 25 10kV 側(cè)隔離開關(guān)選擇 .................................................................. 25 互感器的選擇 ...................................................................................... 26 電流互感器的選擇 ....................................................................... 27 電壓互感器的選擇 ....................................................................... 29 母線的選擇 .......................................................................................... 30 35kV 側(cè)母線的選擇 ...................................................................... 30 10kV 側(cè)母線的選擇 ....................................................................