【正文】 沈陽工程學(xué)院畢業(yè)設(shè)計（論文） I 城北變電所繼電保護設(shè)計 摘 要 本文對城北變電所可能會出現(xiàn)的故障、進行了保護及安裝配置。對二次變電站的變壓器可能出現(xiàn)各種類型的故障和不正常運行狀態(tài)進行了分析。對主接線進行選擇。并按照 GB14258— 1993《繼電保護和安全自動化裝置技術(shù)規(guī)程》的規(guī)定為變壓器裝設(shè)瓦斯保護、差動保護、過電流保護和過負(fù)荷保護裝置，提高了變壓器安全運行。 變電所中線路可能會出現(xiàn)相間短路，接地故障、過電流，根據(jù)規(guī)程配置了電流保護、電流速斷保護、過電流保護及絕緣監(jiān)察裝置。 針對變電站母線可能會出現(xiàn)單相接地和相間短路故障，根據(jù)母線電壓等 級的不同，對 10kV母線采用了雙母線固定連接的母線差動保護。 以上保護安裝構(gòu)成變電所的繼電保護系統(tǒng)，保證城北變電所的安全運行及供電質(zhì)量。為運行設(shè)備和運行人員的安全提供保障。 關(guān)鍵詞 差動保護，過電流保護，過負(fù)荷保護，電流速斷保護 城北變電所繼電保護設(shè)計 II Abstract In this paper, the north substations may appear the fault, the protection and installation configuration. For the secondary substation transformer may appear various types of faults and abnormal running state are analyzed. And according to the GB142581993 “Technical code for relay protection and safety automation devices “regulation for transformer installed gas protection, differential protection, pound voltage starting, overcurrent protection, current instantaneous fault protection and overload protection device, improve the safe operation of the transformer. The substation circuit may occur in the interphase short circuit, grounding fault, current, according to the rules of configuration of the current protection, current instantaneous fault protection, over current protection and insulation monitoring device. Aim at substation busbar may appear single phase grounding fault and alternate with, according to difference of busbar voltage grade, for 10 kv bus adopted the fixed connection of double busbar differential protection. Above installation of substation protection relay protection system, ensure dragon temple substation safe operation and power supply quality. This guarantee for running equipment and personnel safety. Key words differential protection, over current protection, overload protection, current instantaneous fault protection 沈陽工程學(xué)院畢業(yè)設(shè)計（論文） 目 錄 摘 要 ............................................................... I Abstract ..........................................................................................................................II 第一章說明書 ................................................................................................................ 1 1 引 言 ................................................................................................................ 1 2 城北新建變電所簡要介紹 ................................................................................. 2 3 運行方式分析 ..................................................................................................... 2 最大運行方式 .......................................................................................... 2 最小運行方式 .......................................................................................... 2 正常運行方式 .......................................................................................... 2 雙電源供電的運行方式 .......................................................................... 3 4 主接線選擇 ........................................................................................................ 3 單母線接線 .............................................................................................. 3 單母線分段接線 ...................................................................................... 3 帶旁路母線的單母線接線 ...................................................................... 4 單母線分段帶旁路的接線 ..................................................................... 4 雙母線接線 ............................................................................................. 4 3/2 接線 ................................................................................................ 4 橋形接線 .................................................................................................. 4 變電所主接線方案確定 .......................................................................... 5 5 選定繼電保護方案 ............................................................................................. 6 6 變壓器保護 ......................................................................................................... 7 變壓器的保護配置方案 .......................................................................... 7 變壓器保護裝設(shè)原則 .............................................................................. 7 變壓器的縱聯(lián)差動保護 .......................................................................... 8 變壓器瓦斯保護 .................................................................................... 11 變壓器的過電流保護 ............................................................................ 12 變壓器的過負(fù)荷保護 ............................................................................ 14 7 線路的保護配置方案 ....................................................................................... 15 中性點不接地電網(wǎng)故障的現(xiàn)象 ............................................................ 15 單回線路的電流速斷保護 .................................................................... 16 線路保護原理 ........................................................................................ 17 單回線縱聯(lián)差動保護 ............................................................................ 21 縱聯(lián)差動保護的整定與靈敏度校驗 .................................................... 22 第二章計算書 .............................................................................................................. 24 1 參數(shù)計算 ........................................................................................................... 24 等值等值電路圖（標(biāo)么值）及短路故障點的選擇 ............................ 24 電氣主要設(shè)備參數(shù) ................................................................................ 24 標(biāo)么值歸算 ............................................................................................ 25 2 正常方式運行下短路電流計算 ....................................................................... 26 DQFI 斷開， DQF2 閉合 .....................