【正文】 ave a good price quality. Considering the characteristic of district and the greate development of boxtype electric substation ,It is good to divide the district to several zones. Every zone’s power is supplied by a boxtype electric substation. the mand is equiped by parallel capacitor， and one or two transformers that offer electric power to buildings nearby. In the field of address of transformer ,I follow electricity ordinanceand electrical safety mustn’t affect the normal life. When drawing the schematic diagram ,I consider the distribution of the domestic load and the direction of the roads , on the principle of high efficiency and save resources ,to optimize of the the respect of underground cable ,I follow the Cable Layingof electric power engineering handbook and other relating to national standards. the Short Circuit Current has been analyzed, Major equipment has beed tested and calibrated. lightning protective earthing system has been designed in a systematic way. Keywords: Power distribution system； Power substation； The transformer 吉林化工學院畢業(yè)設計說明書 III 目 錄 摘 要 .................................................................................................................................. I Abstract ...................................................................................................................................II 第 1 章 概述 ........................................................................................................................... 1 設計對象及目標 ....................................................................................................... 1 設計的主要任務 ....................................................................................................... 1 設計遵循的原則 ....................................................................................................... 1 設計資料 .................................................................................................................. 1 小區(qū)平面圖 ..................................................................................................... 1 供電電源情況 ................................................................................................. 2 當?shù)氐臍庀鬆顩r ....................................................................................................... 2 當?shù)赜秒娰M用 .......................................................................................................... 2 對于電氣設計的 要求 ............................................................................................... 3 第 2 章 負荷等級及供電電源 ................................................................................................ 4 第 3 章 無功補償 ................................................................................................................... 7 無功補償點的設定 ................................................................................................... 7 無功補償容量的確定 ............................................................................................... 7 第 4 章 變壓器的選擇和電氣主接線 .................................................................................. 11 無功補償后小區(qū)負荷 ............................................................................................. 11 選擇變壓器的原則 ................................................................................................. 11 選擇變壓器的數(shù)量 ................................................................................................. 12 選擇變壓器的容量安裝一臺主變壓器 .................................................................. 12 其他因素 ................................................................................................................ 12 負荷中心的計算 ..................................................................................................... 12 主變壓器選擇的方案 ............................................................................................. 13 變電所主接線方案的選擇 ..................................................................................... 13 第五章 短路電流計算 ......................................................................................................... 15 造成短路的原因 ..................................................................................................... 15 短路造成的后果 ..................................................................................................... 15 短路的幾種形式 ..................................................................................................... 15 短路電流的計算 ..................................................................................................... 16 標幺值法計算 ........................................................................................................ 16 小區(qū)供配電設計 IV 計 算電路圖及短路電流計算 ................................................................................. 18 第 6 章 變配電所一次設備的選擇和校驗 ........................................................................... 22 高壓一次設備的選擇校驗項目和條件 .................................................................. 22 380V側設備選擇 .................................................................................................... 26 第 7 章 二次回路和繼電保護 .............................................................................................. 31 二次回路 ................................................................................................................ 31 電能測量 ................................................................................................................ 31 變壓器的繼電保護 ................................................................................................. 32 高壓斷路器的控制和信號回路 .............................................................................. 33 第 8 章 防雷接地系統(tǒng) ......................................................................................................... 34 防雷措施 ..............................