【正文】 the design to the actual problem (or research) the prehensive training, simultaneously or we future will move towards the basic practice which the work post will establish. May strengthen us through this design to utilize studies the knowledge explanation actual problem the ability and the innovation ability, in order to meets the work need design is at guiding teacher descend, passing oneself of design what argument plete with meticulous care. Whole design process inside, pletely dependable, economic, vivid...etc. many factors that meticulous consideration engineering design, end plete this design project. The Electric power system’s protective relaying design and distribution whether is rational directly affect safe operation whon selecting protective duty. Should satisfy basic requires of protectivc relaying selecting protective detty and right calculated setting ensures the electric power system’s safe operation. Key Words electric power system, relay protection, setting(up) to pute, sensitivity calibration 漢中一次降壓變電所繼電保護部分初步設計 III 目 錄 摘 要 ............................................................................................................................................... I ABSTRACT........................................................................................................................................II 第一篇 說明書 ............................................................................................................................... 1 第一章 主變壓器的選擇 ............................................................................................................... 1 主變壓器臺數(shù)的確定 ........................................................................................................... 1 變壓器形式的選擇 ............................................................................................................... 1 主變容量的確定 ................................................................................................................... 1 第二章 電氣主接線的選擇 ........................................................................................................... 3 電氣主接線的設計原則 ...................................................................................................... 3 電氣主接線的基本要求 ...................................................................................................... 3 電氣主接線的設計程序 ...................................................................................................... 5 主接線的擬定方案及選擇 .................................................................................................. 6 第三章 短路電流計算 ................................................................................................................... 8 短路電流計算的目的、規(guī)定和步驟 ................................................................................... 8 三相短路電流的計算 .......................................................................................................... 9 第四章 變電所保護裝置 ............................................................................................................. 12 變電所繼電保護配置 ........................................................................................................ 12 變壓器的各種保護原理 .................................................................................................... 17 第二篇 計算書 ............................................................................................................................. 28 第一章 主變壓器選擇的容量計算 ............................................................................................. 28 變電所 60KV 的用戶總容量 .............................................................................................. 28 折算到變壓器的容量 ........................................................................................................ 28 確定主變壓器容量 ............................................................................................................ 28 第二章 短路電流計算 ................................................................................................................. 29 三相對稱短路計算 ............................................................................................................ 29 元件阻抗歸算到系統(tǒng)的標幺值計算 ................................................................................ 29 網(wǎng)絡化簡 ............................................................................................................................ 30 短路點計算 ........................................................................................................................ 33 60KV 側最小運行方式下的短路電流 ............................................................................... 37 第三章 整定計算部分 ................................................................................................................. 39 變壓器的整定計算原則及其整定計算 ............................................................................. 39 變壓器瓦斯保護整定 ......................................................................................................... 39 變壓器差動保護整定 ......................................................................................................... 39 復合電壓起動的過電流整定計算 ..................................................................................... 43 沈陽工程學院畢 業(yè)設計（論文） IV 過電流保護的整定計算 ..................................................................................................... 43 過負荷保護的整定計算 ..................................................................................................... 44 變壓器油溫監(jiān)測 ................................................................................................................. 44 結 論 ............................................................................................................................................ 45 參考文獻 ............................................................................................................