【正文】
額定電流:5000A額定開(kāi)斷電流:105KA動(dòng)穩(wěn)定電流(峰值):300KA熱穩(wěn)定電流:120KA(5S)1,2,3號(hào)發(fā)電機(jī)出線工作電流: Ig=x93%=4,5號(hào)發(fā)電機(jī)出線工作電流: Ig=x93%=出線工作電流,母聯(lián)工作電流: Ig==: Ig= =動(dòng)穩(wěn)定電流: ich== idf=300KA ich idf 滿足要求熱效應(yīng): Q=Q2+Qt=(I2+10I22+I24)t/12+2 =(++)x4+=16395KA2 S Qe==3969 KA2設(shè)計(jì)內(nèi)容歷時(shí)一個(gè)學(xué)期,編寫(xiě)了畢業(yè)設(shè)計(jì)說(shuō)明書(shū)(包括目錄、摘要、前言、計(jì)算說(shuō)明、設(shè)計(jì)內(nèi)容、結(jié)論、外文翻譯、參考文獻(xiàn))與畢業(yè)設(shè)計(jì)計(jì)算書(shū)(包括參數(shù)計(jì)算、短路計(jì)算、設(shè)備選擇及校驗(yàn)),繪制主接線圖2張、繼電保護(hù)配置圖1張、220KV開(kāi)關(guān)站平面布置圖1張,220KV開(kāi)關(guān)站平面布置手工圖一張,共5張圖。s to is a transistor to protect the booming development after the electricity in 8039。s beginning our country.Protecting after the electricity future trend in technique is to turns to calculator, the network turn, the intelligence turn, protect, control, measuring to correspond by letter with the data the integral whole turn the development. The electric power system increases continuously to the protective request in tiny machine, in addition to protective and basic function, should still have the big capacity break down the information to deposit the space with data over a long period of time, the fast data handles function, mighty correspondence ability, protect, control with other to equip with adjust an ability for the net to share whole system data, information with network resources, high class language plait distance etc..This will beg the tiny machine protection equips the function that have an equal to set PC the development in the calculator early, onced conceived to use a the small scaled calculator in set makes after electricity protection the at that time small scaled machine physical volume is big, the cost is high, the dependable is bad, it is not realistic that this , the together tiny machine protection equiped the function, speed, saving capacity that the work of the size likeness control machine to exceed the small scaled machine of that year consumedly, therefore, use a work controls the machine makes after electricity the protective opportune moment is already mature, this will be an one of the protective development in tiny machine directions. Turn after the tiny machine that protection equip of electricity, it is the development trend that can39。s the our country have set up after electricity protection research, design, make and circulate with the plete system of the is the ages that machine electricity type prospers after the electricity protection, after the electricity for the our country From the end of 5039。 SQ Qe 熱穩(wěn)定滿足要求: 型號(hào):LCLWD220額定電壓:220KV額定電流比:2x300/5動(dòng)穩(wěn)定電流(倍數(shù)):381S熱穩(wěn)定電流(倍數(shù)):21: 型號(hào):YDR220額定電壓://100最大容量:1200VA二次負(fù)荷: 1501 220 3 440: 由系統(tǒng)穿越功率可知:Ig=選2根LGJ鋁絞線——630載流量:Iyu== IgQ=QZ+Qt=(I2+10I+I)t/12+2 =(++)+= KA2 S Qe=212x5=2205 KA2W 導(dǎo)體對(duì)垂直于作用力方向軸的截面系數(shù)。(4) 動(dòng)穩(wěn)定校驗(yàn)① 軟導(dǎo)線無(wú)需動(dòng)穩(wěn)定校驗(yàn)。 110kv及以上高壓配電裝置,一般采用軟導(dǎo)線。用于電能測(cè)量的互感器準(zhǔn)確級(jí):a、b、c、d、一般保護(hù)用的電流互感器可選用3級(jí),差動(dòng)距離及高頻保護(hù)用的電流互感器宜選用D級(jí),零序接地保護(hù)可釆用專用的電流互感器,保護(hù)用電流互感器一般按10%倍數(shù)曲線進(jìn)行校驗(yàn)計(jì)算。 (具體選擇計(jì)算見(jiàn)畢業(yè)設(shè)計(jì)計(jì)算書(shū))。電壓互感器三個(gè)單相電壓互感器接線,主二次繞級(jí)連接成星形,以供電給測(cè)量表計(jì),繼電器以及絕緣電壓表,對(duì)于要求相電壓的測(cè)量表計(jì),只有在系統(tǒng)中性點(diǎn)直接接地時(shí)才能接入,附加的二次繞組接成開(kāi)口三角形,構(gòu)成零序電壓濾過(guò)器供電給繼電器和接地信號(hào)(絕緣監(jiān)查)繼電器。熔斷器是最簡(jiǎn)單的保護(hù)電器,它用來(lái)保護(hù)電氣設(shè)備免受過(guò)載電流的損害,屋內(nèi)型高壓熔斷器在變電所中常用于保護(hù)電力電容器配電線路和配電變壓器,而在電廠、及變電所中多用于保護(hù)電壓互感器。tdz≤It178。大容量機(jī)組釆用封閉母線時(shí),如果需要裝設(shè)斷路器,宜選用發(fā)電機(jī)專用斷路器。用熔斷器保護(hù)的電器可不校驗(yàn)熱穩(wěn)定。用熔斷器保護(hù)的電器可不校驗(yàn)熱穩(wěn)定。(8) 繪制短路電流計(jì)算結(jié)果表。選擇其導(dǎo)體和電器時(shí),短路計(jì)算點(diǎn)一般取在電抗器后。(5) 所有同步電機(jī)都具有自動(dòng)調(diào)整勵(lì)磁裝置(包括強(qiáng)行勵(lì)磁)。例如:計(jì)算某一時(shí)刻的短路電流有效值,用以校驗(yàn)開(kāi)關(guān)設(shè)備的開(kāi)斷能力和確定電抗器的電抗值;計(jì)算短路后較長(zhǎng)時(shí)間短路電流有效值,用以校驗(yàn)設(shè)備的熱穩(wěn)定;計(jì)算短路電流沖擊值,用以校驗(yàn)設(shè)備動(dòng)穩(wěn)定。 斷路器的選擇斷路器參數(shù)表裝設(shè)位置型號(hào)額定電壓KV額定電流A額定開(kāi)斷電流KA動(dòng)穩(wěn)定電流(峰值)KA熱穩(wěn)定電流KALW1220/2000(W)22020004010040(4S)220KV側(cè)3號(hào)主變進(jìn)線LW122/2000(W)22020004010040(4S)220KV側(cè)出線回路LW1220/2000(W)22020004010040(4S)SW411011010005521(5S)110KV側(cè)出線回路SW411011010005521(5S)(母聯(lián))SNA10G/5000105000105300120(5S)10KV側(cè)出線回路SNA10G/5000105000105300120(5S)1,2,3,4,5號(hào)發(fā)電機(jī)出線SNA10G/5000105000105300120(5S) 隔離開(kāi)關(guān)的選擇 隔離開(kāi)關(guān)參數(shù)表安裝位置型號(hào)額定電壓(KV)額定電流(A)動(dòng)穩(wěn)定電流(峰值)KA熱穩(wěn)定電流KA(4S)GW4220/2000220200010040220KV側(cè)3號(hào)主變進(jìn)線GW4220/2000220200010040220KV側(cè)出線回路GW4220/2000220200010040GW4110G/1250110125080110KV側(cè)出線回路GW4110G/1250110125080(母聯(lián))GN2320/800020800030012010KV側(cè)出線回路GN2320/80002080003001201,2,3,4,5號(hào)發(fā)電機(jī)出線GN2320/8000208000300120 高壓熔斷器的選擇RN2型高壓熔斷器參數(shù)表安裝位置型號(hào)額定電壓額定電流最大開(kāi)斷容量最大切斷電流(有效值)(KA)最大切斷電流或過(guò)電壓倍數(shù)10KV母線RN210100050(A)4,5號(hào)發(fā)電機(jī)出口RN210100050(A) 電抗器的選擇電抗器參數(shù)表安裝位置型號(hào)額定電壓(KV)額定電流(A)動(dòng)穩(wěn)定電流(峰值)KA熱穩(wěn)定電流KA(4S)10KV側(cè)出線回路XKK104000610400020480 電壓互感器的選擇電壓互感器參數(shù)表安裝 位置型 式(屋外式)額定電壓(KV)最大容量(VA)二次額定容量(VA)一次線圈一次線圈134,5號(hào)發(fā)電機(jī)出口電壓互感器單相JDJ101064080150320220KV母線電壓互感器三相YDR2201200150220440110KV電壓互感器三相YDR110120015022044010KV母線電壓互感器三相JSJB1010960120200480 電流互感器的選擇電流互感器參數(shù)表安裝位置型號(hào)額定電流比A1S熱穩(wěn)定電流KA(倍)動(dòng)穩(wěn)定電流KA(倍)LCLWD22202x300/52138220KV側(cè)3號(hào)主變進(jìn)線LCLWD22202x300/52138220KV側(cè)出線回路LCLWD22202x300/52138LCWDL1102x502x600/575135110KV側(cè)出線回路LCWDL1102x502x600/575135(母聯(lián))LAJ1020006000/5509010KV側(cè)出線回路LAJ1020006000/550901,2,3,4,5號(hào)發(fā)電機(jī)出線LAJ1020006000/55090 避雷器的選擇避雷器參數(shù)表安裝位置型號(hào)額定電壓滅弧電壓(KV,有效值)(KV,不大于)220KV母線避雷器FCZ220J22020051510KV母線避雷器FZ101045主變壓器220KV側(cè)避雷器FCZ220J220200515主變壓器110KV側(cè)避雷器FCZ110110126345主變壓器10KV側(cè)避雷器FZ101045 母線的選擇母線參數(shù)表位置型號(hào)材料導(dǎo)體截面(mm2)導(dǎo)體最高允許溫+700C時(shí)的Iy(A)220KV母線LHBJ絞線鋁合金630118210KV母線槽型母線鋁68707550220KV側(cè)主變進(jìn)線LHBJ絞線鋁合金6301182110KV側(cè)主變進(jìn)線LHBJ絞線鋁合金500102410KV側(cè)主變進(jìn)線槽型母線鋁13902620第二部分 短路電流計(jì)算1 短路計(jì)算短路是電力系統(tǒng)最常見(jiàn)的故障,所謂短路,是指一切不正常的相與相之間或相與地(對(duì)于中性點(diǎn)接地系統(tǒng))發(fā)生通路的情況。同時(shí),配電裝置結(jié)構(gòu)復(fù)雜,也增加了維修工作量。(2) 電機(jī)電壓母線上最大一臺(tái)發(fā)電機(jī)組停用時(shí),能由系統(tǒng)供給發(fā)電機(jī)電壓的 最大