【正文】 摘 要 此次設(shè)計的題目是“南苑 110kV 降壓變電站電氣部分設(shè)計”。主要任務(wù)是根據(jù)變電所運行要安全、可靠的要求，確定主接線方案，根據(jù) 35kV 側(cè)和 10kV 側(cè)的負荷選擇主變壓器；畫出短路圖，經(jīng)過計算列出短路計算表；計算各回路的最大持續(xù)工作電流，選擇 斷路器、隔離開關(guān)、電壓互感器、電流互感器、避雷器、熔斷器 、母線等 設(shè)備，并通過短路計算結(jié)果 校驗所選的設(shè)備 符合要求 ；配電裝置的設(shè)計應(yīng)滿足安全可靠的要求，在本次設(shè)計中，配電裝置選用已經(jīng)長期運行檢驗合 格的配電裝置；防雷接地的計算，在變電所外按配置原則裝設(shè)四支 高度為 30 米等高避雷針，計算所裝設(shè)的避雷針可以 保護全所的范圍；利用 WBZ500H 微機型變壓器保護裝置對所設(shè)計的變電所主變壓器進行保護。 使變壓器安全、穩(wěn)定的運行。 關(guān)鍵詞 ：主接線 ；短路電流計算； 設(shè)備 選擇與 校驗 ；微機保護 Abstract My graduation thesis topic is:The electric section design of Nanyuan 110kV stepdown station , The main task of this graduates design is ensure the plan of electric main line by way of the regular that power system operate safty and stability . Draw a chart about shortcircuit。 Lay out the chart of shortcircuit result。To putate maxgI。Choose the main electric appliance equipments。For example :bus bar 、 interrupter 、 disconnect switch、 current transformer、 potential transformer、 lightning arresters 、 fuse and so the electric equipments by way of shortcircuit calculation 。The design of distribution install should operate safty and reliablely 。In this design ,we chose the installs which operate many years. The calculation about Lighting Grounding,we plan install four lightning conductor and check four conductor can protect station very well 。 we use WBZ500H Protection to protect transformer and ensure the safty of transformer . keywords: electric main line。 shortcircuit calculation。 check and choose electric appliance equipments。 protection 目 錄 引 言 ................................................................................................................................... 1 第一章 110KV變電站電氣主接線設(shè)計 ........................................................................... 2 原始資料 ................................................................................................................... 2 變電所規(guī)模及其性質(zhì) ....................................................................................... 2 負荷分析 ........................................................................................................... 2 對配電裝置選擇的初步分析 ........................................................................... 2 主接線設(shè)計的原則 ................................................................................................... 2 設(shè)計主接線的要求 ........................................................................................... 2 設(shè)計步驟 ........................................................................................................... 3 本變電所主接線方案的確定 ........................................................................... 3 第二章 主變壓器選擇 ....................................................................................................... 7 原始資料 ................................................................................................................... 7 主變壓器選擇 ........................................................................................................... 7 臺數(shù)的選擇 ....................................................................................................... 7 主變壓器型式的選擇 ....................................................................................... 7 本變電所主變壓器 的確定 ............................................................................... 7 電抗器的選擇 ................................................................................................... 9 第三章 短路計算 ............................................................................................................... 11 短路計算的規(guī)定和步驟 ......................................................................................... 11 短路電流計算的目的 ..................................................................................... 11 短路電流計算的一般規(guī)定 ............................................................................. 11 計算步驟 ......................................................................................................... 12 相關(guān)參數(shù)計算 ......................................................................................................... 12 變壓器參數(shù)的計算 ......................................................................................... 13 發(fā)電機參數(shù)的計算 ......................................................................................... 16 線路參數(shù)的計算 ............................................................................................. 18 等值網(wǎng)絡(luò)的化簡 ..................................................................................................... 19 短路點的選擇 ..................................................................................................... 21 短路計算 ................................................................................................................. 22 4 短路點 d1 處 .................................................................................................. 22 短路點 d2 處 .................................................................................................. 23 短路點 d3 處 .................................................................................................. 23 短路點 d4 處 .................................................................................................. 24 第四章 主要電氣設(shè)備選擇 ............................................................................................. 25 電氣 設(shè)備選擇的基礎(chǔ)知識 ..................................................................................... 25 一般原則 ......................................................................................................... 25 技術(shù)條件 ......................................................................................................... 25 環(huán)境條件 ......................................................................................................... 27 斷路器的選擇與校驗 ...................................................