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110kx降壓變電站的一次系統(tǒng)初步設(shè)計(jì)(已修改)

2025-07-11 18:15 本頁(yè)面
 

【正文】 (2022 屆)本科畢業(yè)設(shè)計(jì)(論文)最終評(píng)定成績(jī): 2022 年 5 月摘 要變電站作為電力系統(tǒng)中的重要組成部分,直接影響整個(gè)電力系統(tǒng)的安全與經(jīng)濟(jì)運(yùn)行。本論文中待設(shè)計(jì)的變電站是一座降壓變電站,在系統(tǒng)中起著匯聚和分配電能的作用,擔(dān)負(fù)著向該地區(qū)工廠(chǎng)、農(nóng)村供電的重要任務(wù)。該變電站的建成,不僅增強(qiáng)了當(dāng)?shù)仉娋W(wǎng)的網(wǎng)絡(luò)結(jié)構(gòu),而且為當(dāng)?shù)氐墓まr(nóng)業(yè)生產(chǎn)提供了足夠的電能,從而達(dá)到使本地區(qū)電網(wǎng)安全、可靠、優(yōu)質(zhì)、經(jīng)濟(jì)地運(yùn)行的目的。本論文《110kV 某市變電站一次系統(tǒng)設(shè)計(jì)》 ,首先通過(guò)對(duì)原始資料的分析及根據(jù)變電站的總負(fù)荷選擇主變壓器,同時(shí)根據(jù)主接線(xiàn)的經(jīng)濟(jì)可靠、運(yùn)行靈活的要求,選擇了兩種待選主接線(xiàn)方案進(jìn)行了技術(shù)比較,淘汰較差的方案,確定了變電站電氣主接線(xiàn)方案。其次進(jìn)行短路電流計(jì)算,從三相短路計(jì)算中得到當(dāng)短路發(fā)生在各電壓等級(jí)的母線(xiàn)時(shí),其短路穩(wěn)態(tài)電流和沖擊電流的值。再根據(jù)計(jì)算結(jié)果及各電壓等級(jí)的額定電壓和最大持續(xù)工作電流進(jìn)行主要電氣設(shè)備選擇及校驗(yàn)(包括斷路器、隔離開(kāi)關(guān)、電流互感器、電壓互感器等) 。最后,做了防雷保護(hù)、繼電保護(hù)、并繪制了電氣主接線(xiàn)圖。關(guān)鍵詞:變電站,降壓,電氣設(shè)備ABSTRACTPower system substation as an important part of the entire power system directly affects the safety and economic operation. To be designed in this paper is a stepdown substation in the system plays the role of aggregation and distribution of electric energy, charged with the factory to the region, the important task of rural electrification. The pletion of the substation will not only strengthen the local power grid work structure, but also for the local industrial and agricultural production provides enough power, so that the regional power grid so as to achieve safe, reliable, quality, aim to run the economy.I n this thesis, 110kV substation city primary system design, first through the analysis of raw data and selected based on total load of the substation main transformer, the main wiring under both economical and reliable, flexible operation requirements, select the main connection of the two to be elected A technical parison program, out of poor program to determine the main electrical substation connection program.Second, the shortcircuit current calculation, obtained from the threephase short circuit calculation occurs when shortcircuit the voltage level of the bus, its steadystate current and the impact of shortcircuit current value. According to the results and the voltage level of voltage and maximum continuous operating current of the main electrical equipment selection and validation (including circuit breaker, disconnecting switch, current transformer, voltage transformer, etc.).Finally, the main draw of the electrical wiring diagram, electrical general layout plans, with lightning protection.Keywords:Power system substation, stepdown substation, electrical equipment目 錄摘 要 ........................................................IABSTRACT .......................................................................................................II第 1 章 設(shè)計(jì)內(nèi)容和任務(wù) ........................................1 原始資料分析 .............................................1 .....................................1 .............................1 .......................................2 .......................................2 .................................................3第二章 主變壓器的選擇 ........................................4 ...........................................4 .................................7第三章 電氣主接線(xiàn)的選擇 ......................................8 .................................................8 ...........................8 ...............................9 .............................9 側(cè)主接線(xiàn)方案 ...................................10 側(cè)主接線(xiàn)方案 ....................................12 側(cè)主接線(xiàn)方案 ....................................13第四章 短路電流計(jì)算 .........................................15 ..................................15 ......................................15 ..................................15 的計(jì)tI算。 ......................................................15 ..................................15 ........................................16 ........................................17 ......................................17 ................................17 ............................................17(最大運(yùn)行方式下) ..............17 ............................18 ......................18 ......................19 ......................21第五章 導(dǎo)體和電氣設(shè)備的選擇 .................................22 ......................................22 ..........................................23 ............................................29 ..............................................31 ........................................36第六章 變電站防雷保護(hù) .......................................39 .........................................39 .......................................39 .....................................41第 7 章 繼電保護(hù) .............................................40 .........................................4線(xiàn)路的保護(hù)和自動(dòng)裝置 ......................43結(jié) 論 ........................................................45參考文獻(xiàn) .....................................................46致 謝 ........................................................47附 錄 ........................................................48第 1 章 設(shè)計(jì)內(nèi)容和任務(wù) 原始資料分析根據(jù)電力系統(tǒng)的規(guī)劃需要安裝兩臺(tái)容量為 MVA,電壓為 110kV/35kV/10kV的主變壓器,主變各側(cè)容量比為 100/100/100,一次設(shè)計(jì)并建成。待設(shè)計(jì)的變電站是一座降壓變電站,擔(dān)負(fù)著向該地區(qū)工廠(chǎng)、農(nóng)村供電的重要任務(wù)。本變電站有兩回平行線(xiàn)路與 110kV 電力系統(tǒng)連接,有兩回 35kV 電力系統(tǒng)連接。本變電站在系統(tǒng)最大運(yùn)行方式下的系統(tǒng)正、負(fù)阻抗的標(biāo)么值示意圖如圖 11(Sj=100MVA),110kV 及 35kV 電源容量為無(wú)窮大,阻抗值各包含平行線(xiàn)路阻抗在內(nèi)。電所不考慮裝調(diào)相機(jī)、電容器等無(wú)功補(bǔ)償設(shè)備,35kV 因電網(wǎng)線(xiàn)路的電容電流較少,也不裝設(shè)消弧線(xiàn)圈。110kV 出線(xiàn)無(wú)電源。電力負(fù)荷水平110kV 進(jìn)出線(xiàn)共 2 回,兩回進(jìn)線(xiàn)為 110kV 的平行供電線(xiàn)路,正常送電容量各為35000KVA。35kV 進(jìn)出線(xiàn)共 2 回,兩回進(jìn)線(xiàn)連接著 35kV 電源,輸送容量各為 35000KVA。10kV 出線(xiàn)共 12 回,全部為架空線(xiàn)路,其中 3 回每回輸送容量按 5000KVA 設(shè)計(jì);圖 11 變電所連接示意圖另外 5 回每回輸送容量為 4000KVA,再預(yù)留四個(gè)出線(xiàn)間隔,待以后擴(kuò)建。本變電站自用電主要負(fù)荷如表 11。表 11 110kV 變電站自用電負(fù)荷序 號(hào) 設(shè)備名稱(chēng) 額定容量(kW)功率因數(shù)(cosφ)安裝臺(tái)數(shù)工作臺(tái)數(shù) 備 注1 主充電機(jī) 20 1 1 周期性負(fù)荷2 浮充電機(jī) 1 1 經(jīng)常性負(fù)荷3 主變通風(fēng) 32 32 經(jīng)常性負(fù)荷4 蓄電池通風(fēng) 1 1 經(jīng)常性負(fù)荷5 檢修、試驗(yàn)用電 15 經(jīng)常性負(fù)荷6 載波通訊用電 1 經(jīng)常性負(fù)荷7 屋內(nèi)照明 8 屋外照明 9 生活水泵 2 2 周期性負(fù)荷10 福利區(qū)用電 周期性負(fù)荷當(dāng)用電設(shè)備組計(jì)算負(fù)荷直接相加時(shí),按需要系數(shù)法,取 K∑p=—,總的有功負(fù)荷:P30=K∑p*∑,取系數(shù)為 得:S=++(20++*32++15+1+*2+)*=環(huán)境條件當(dāng)?shù)啬曜罡邷囟?℃,年最低溫度-℃,最熱月平均最溫度 29℃;最熱月平均地下 土壤溫度 ℃。當(dāng)?shù)睾0胃叨?。當(dāng)?shù)乩纂娙?T= 日/年。系統(tǒng)負(fù)荷情況計(jì)算35KV 最終兩回出線(xiàn),負(fù)荷同時(shí)率按 考慮,負(fù)荷增長(zhǎng)率為 4%。 35KV 總負(fù)荷為:(35/)2(1+4%)5=10KV 最終十二回出線(xiàn),負(fù)荷同時(shí)率按 考慮,負(fù)荷增長(zhǎng)率為 4%。10K 負(fù)荷為:3(5/)(1+
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