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1、浙浙江江浙浙能能蘭蘭溪溪發(fā)發(fā)電電廠廠工工程程廠廠用用電電電電壓壓及及電電纜纜截截面面校校驗(yàn)驗(yàn)計(jì)計(jì)算算書書批批準(zhǔn)準(zhǔn)：審審核核：校校核核：編編寫寫：電電壓壓校校驗(yàn)驗(yàn)計(jì)計(jì)算算(兩兩段段式式方方案案)一、計(jì)算依據(jù)1.發(fā)電機(jī)額定容量600 MW2.高壓廠用變壓器容量SB38 MVA 電動(dòng)給水泵母線上的計(jì)算容量37.1377 MVA 二次側(cè)額定電流3483A 變壓器的阻抗Ud(標(biāo)么值)15%X/R303.高壓起動(dòng)/備用變壓器容量SB238 MVA 電動(dòng)給水泵母線上的計(jì)算容量37.1377 MVA 二次側(cè)額定電流3483A 變壓器的阻抗Ud(標(biāo)么值)15%X/R304.廠用電系統(tǒng)線電壓6.3 kV5.真空斷2、路器參數(shù) 額定開(kāi)斷電流50 kA 額定沖擊電流125 kA 全跳閘時(shí)間tgu60 mS6.主保護(hù)動(dòng)作時(shí)間50 mS7.廠用電系統(tǒng)采用快切裝置有8.高壓廠用變壓器上最大一臺(tái)電動(dòng)機(jī)為電動(dòng)給水泵額定功率Ped9100 kW 電動(dòng)給水泵電動(dòng)機(jī)的額定效率d0.975 電動(dòng)給水泵電動(dòng)機(jī)的額定功率因數(shù)cosd0.89 電動(dòng)給水泵電動(dòng)機(jī)的起動(dòng)電流倍數(shù)69.高壓起動(dòng)/備用變壓器上最大一臺(tái)電動(dòng)機(jī)為電動(dòng)給水泵額定功率Ped9100 kW 電動(dòng)給水泵電動(dòng)機(jī)的額定效率d0.975 電動(dòng)給水泵電動(dòng)機(jī)的額定功率因數(shù)cosd0.89 電動(dòng)給水泵電動(dòng)機(jī)的起動(dòng)電流倍數(shù)610.高壓廠用變壓器參加反饋電動(dòng)機(jī)容量總和Ped29010 3、kW 高壓廠用變壓器成組自起動(dòng)電動(dòng)機(jī)容量總和Ped27980 kW11.高壓起動(dòng)/備用變壓器參加反饋電動(dòng)機(jī)容量總和Ped29010 kW 高壓起動(dòng)/備用變壓器成組自起動(dòng)電動(dòng)機(jī)容量總和Ped27980 kW二、最大一臺(tái)電動(dòng)機(jī)正常起動(dòng)時(shí)母線電壓1.公式 式中：S1電動(dòng)機(jī)起動(dòng)前，母線上已有的負(fù)荷(以SB為基準(zhǔn)值的標(biāo)么值)%011.0)(1100%10dqmUSSUU)11(Sq起動(dòng)電動(dòng)機(jī)的起動(dòng)容量(以SB為基準(zhǔn)值的標(biāo)么值)U0母線空載電壓(標(biāo)么值)帶負(fù)荷調(diào)壓變壓器：U0=1.1 不帶負(fù)荷調(diào)壓變壓器：U0=1.052.對(duì)于高壓廠用變壓器 按公式(1-1、1-2)對(duì)最嚴(yán)重的1B段計(jì)算S1=0.738Sq4、=1.656Um%=78.85566%要求Um%80%結(jié)果：不滿足要求3.對(duì)于高壓起動(dòng)/備用變壓器 按公式(1-1、1-2)對(duì)最嚴(yán)重的1B段計(jì)算S1=0.738Sq=1.656Um%=78.85566%要求Um%80%結(jié)果：不滿足要求三、成組電動(dòng)機(jī)自起動(dòng)時(shí)廠用母線電壓1.公式 式中：S1Z成組電動(dòng)機(jī)自起動(dòng)前，母線上的已有負(fù)荷(以SB為基準(zhǔn)值的標(biāo)么值)SqZ成組自起動(dòng)總起動(dòng)容量(以SB為基準(zhǔn)值的標(biāo)么值)KqZ成組自起動(dòng)電流倍數(shù) 備用電源為快速切換：KqZ 2.5 備用電源為慢速切換：KqZ 5(參考計(jì)算)2.對(duì)于高壓廠用變壓器 按公式(1-3、1-4)對(duì)最嚴(yán)重的1B段計(jì)算%011.0)(11005、%10dqZZmZUSSUU8.0BedqZqZSPKSddBdeqqCOSSPKS)21()31()41(取S1Z=0 采用快速切換時(shí)的自起動(dòng)SqZ 2.386Um%=78.93005%要求Um%65%結(jié)果：滿足要求 采用慢速切換時(shí)的自起動(dòng)，即失壓自動(dòng)起(參考計(jì)算)SqZ 4.602Um%=62.52396%要求Um%65%結(jié)果：不滿足要求3.對(duì)于高壓起動(dòng)/備用變壓器 按公式(1-3、1-4)對(duì)最嚴(yán)重的1B段計(jì)算取S1Z=0 采用快速切換時(shí)的自起動(dòng)SqZ 2.386Um%=78.93005%要求Um%65%結(jié)果：滿足要求 采用慢速切換時(shí)的自起動(dòng)，即失壓自動(dòng)起(參考計(jì)算)SqZ 4.602Um6、%=62.52396%要求Um%65%結(jié)果：不滿足要求四、高低壓廠用母線串聯(lián)自起動(dòng)時(shí)的廠用母線電壓校驗(yàn)1.高壓廠用母線的電壓Ugm 式中 Sg高壓廠用母線上的合成負(fù)荷(標(biāo)么值)計(jì)算結(jié)果同上 對(duì)高壓廠用變壓器Ugm%=78.93005%要求Ugm%65%結(jié)果：滿足要求 對(duì)高壓起動(dòng)/備用變壓器，Ugm%=78.93005%要求Ugm%65%結(jié)果：滿足要求%011.01100%0dggmUSUU)51(2.低壓廠用母線電壓選擇阻抗最大的公用變壓器進(jìn)行校驗(yàn)，具體參數(shù)如下：Ud=10%KqZ5Ped800 kWSB2000 kVA則 Sd2.5 按公式(1-6、1-7)和已知數(shù)據(jù)計(jì)算：對(duì)高壓廠用變壓器U7、dm%=63.14404%要求Udm%55%結(jié)果：滿足要求 對(duì)高壓起動(dòng)/備用變壓器Udm%=63.14404%要求Udm%55%結(jié)果：滿足要求%1%ddgmdmUSUU8.0BedqZdSPKS)61()71(電電纜纜截截面面熱熱穩(wěn)穩(wěn)定定校校驗(yàn)驗(yàn)(兩兩段段式式方方案案)一、6kV廠用電系統(tǒng)電纜熱穩(wěn)定截面計(jì)算1.三相短路電流周期分量起始有效值 廠用6kV最大一段為1A段的短路電流IB=27.63915 kA 電動(dòng)機(jī)最大反饋電流ID=20.94kA 式中參數(shù)選擇參見(jiàn)DL/T 5153-2002 火力發(fā)電廠廠用電設(shè)計(jì)技術(shù)規(guī)定附錄M2.按短路熱穩(wěn)定選擇電纜截面S 式中，C熱穩(wěn)定系數(shù) 對(duì)YJV-6/6電8、纜(按最高溫度250計(jì)算)，電力工程電氣設(shè)計(jì)手冊(cè)1有以下公式 式中，K常數(shù)，銅為522X106 常數(shù)，銅為235 t1導(dǎo)體短路前的發(fā)熱溫度()，YJV電纜取90 t2短路時(shí)導(dǎo)體最高允許溫度()按公式(2-3）計(jì)算 C=144.563.對(duì)于真空斷路器柜電動(dòng)機(jī)回路電纜TB0.096sTD0.062 s2310 mmCQStDDDBDBTtDDBBBtTITTTTeTIITtIQD2/222)(5.1124)()()32()22()12(124ln10KCttt20.11 s 按公式(2-1、2-2)計(jì)算Qt=344.4014 kA2 sS=128.3783 mm2 此為接母線短路的計(jì)算結(jié)果，選擇電9、纜截面為150mm2可滿足要求。4.對(duì)于真空斷路器柜變壓器回路電纜t2 0.50+0.050.55 s 按公式(2-1、2-2）計(jì)算Qt=692.6883 kA2 sS=182.0657 mm2 此為接母線短路的計(jì)算結(jié)果，選擇電纜截面為185mm2可滿足要求。二、高壓起備變220kV電纜熱穩(wěn)定截面計(jì)算I0”=50 kA5000 kA2 sS=489.1523 mm2 結(jié)論：選擇電纜截面500mm2可滿足要求。tIQt20)(0序號(hào)名稱回路額定功率總臺(tái)數(shù)運(yùn)行方式及臺(tái)數(shù)換算系數(shù)單臺(tái)計(jì)算功率#1A高廠變#1B高廠變廠變總計(jì)#2A高廠變#2B高廠變廠變總計(jì)經(jīng)常不經(jīng)常6kV 1A段6kV 1B段6kV 10、2A段6kV 2B段連續(xù)短時(shí)斷續(xù)連續(xù)短時(shí)斷續(xù)安裝臺(tái)數(shù)計(jì)算臺(tái)數(shù)計(jì)算功率安裝臺(tái)數(shù)計(jì)算臺(tái)數(shù)計(jì)算功率計(jì)算臺(tái)數(shù)計(jì)算功率安裝臺(tái)數(shù)計(jì)算臺(tái)數(shù)計(jì)算功率安裝臺(tái)數(shù)計(jì)算臺(tái)數(shù)計(jì)算功率計(jì)算臺(tái)數(shù)計(jì)算功率kW(kVA)臺(tái)(回)臺(tái)kVA臺(tái)kVA臺(tái)kVAkVA臺(tái)kVA臺(tái)kVAkVA1凝結(jié)水泵2200421220011220011220012200112200112200122002電動(dòng)給水泵9100221910011910019100119100191003循環(huán)水泵400044140001140001140002800011400011400028000P162001530019300620015300193004磨煤機(jī)630111、2100.85535.5331606.5331606.552677.5331606.5331606.552677.55引風(fēng)機(jī)3000440.85255011255011255025100112550112550251006送風(fēng)機(jī)1600440.85136011136011136022720111360111360227207一次風(fēng)機(jī)2240440.85190411190411190423808111904111904238088起動(dòng)系統(tǒng)再循環(huán)泵340220.852891128912891128912899汽動(dòng)給水泵前置泵600440.85510115101151021020115101151012、2102010 閉式循環(huán)冷卻水泵560420.85476114761147614761147611476147611 開(kāi)式循環(huán)冷卻水泵280420.85238112381123812381123811238123812 輸送風(fēng)機(jī)200640.851702234011170234022340111702340P28984.59103.516668.58984.59103.516668.513 增壓風(fēng)機(jī)5500220.854675114675146751146751467514 吸收塔循環(huán)水泵C710220.85603.511603.51603.511603.51603.515 吸收塔循環(huán)水泵B613、30220.85535.511535.51535.511535.51535.516 吸收塔循環(huán)水泵A630220.85535.511535.51535.511535.51535.517 氧化化風(fēng)機(jī)250420.85212.511212.511212.51212.511212.511212.51212.518 GGH低泄漏風(fēng)機(jī)360220.85306113061306113061306P35193.5188768685193.51887686818 汽機(jī)變壓器1250441196111196111196111961111961111961119619 鍋爐變壓器2000441869111869114、11869118691118691118691186920 除塵變壓器2500442200112200112200122001122001122001220021 除灰變壓器125044833118331183318331183311833183322 脫硫變壓器100044909119091190919091190911909190923 公用變壓器2000221755111755117551117551175524 照明變壓器6302242511425142511425142524 檢修變壓器8002242511425142511425142525 循泵變壓器80022719117191715、1911719171926 化水變壓器1250221097111097110971110971109727 廠前區(qū)變壓器1250221140111140111401111401114028 暖通變壓器16002214161114161141611141611416P47432135591398474321355913984工作段計(jì)算容量P1+P2+P3+0.8P4 (kVA)26323.637137.756820.526323.637137.756820.5輸煤段計(jì)算容量 (kVA)9922.47362.8高壓廠變計(jì)算容量 (kVA)3624637137.756820.533686.4371316、7.756820.5選擇變壓器容量Se (kVA)380003800038000380001A段(未含輸煤)參加反饋電動(dòng)機(jī):22880 kW1B段參加反饋電動(dòng)機(jī):28230 kW輸煤段參加反饋電動(dòng)機(jī):5520 kW1A段自起動(dòng)電動(dòng)機(jī)總功率:22270 kW1B段自起動(dòng)電動(dòng)機(jī)總功率:27980 kW序號(hào)名稱回路額定功率總臺(tái)數(shù)運(yùn)行方式及臺(tái)數(shù)換算系數(shù)單臺(tái)計(jì)算功率6kV輸煤段經(jīng)常不經(jīng)常6kV 輸煤A段6kV 輸煤B段兩段總計(jì)連續(xù)短時(shí)斷續(xù)連續(xù)短時(shí)斷續(xù)安裝臺(tái)數(shù)計(jì)算臺(tái)數(shù)計(jì)算功率安裝臺(tái)數(shù)計(jì)算臺(tái)數(shù)計(jì)算功率計(jì)算臺(tái)數(shù)計(jì)算功率kW(kVA)臺(tái)(回)臺(tái)kVA臺(tái)kVA臺(tái)kVAkVA1 斗輪機(jī)500330.8542522817、5011425312752#1A,B皮帶機(jī)185220.85157.2511157.2511157.252314.53#2A,B皮帶機(jī)250220.85212.511212.511212.524254#3A,B皮帶機(jī)220220.85187111871118723745#4A,B皮帶機(jī)185220.85157.2511157.2511157.252314.56#5A,B皮帶機(jī)185220.85157.2511157.2511157.252314.57#7A,B,C皮帶機(jī)500330.854251142522850312758#10A,B皮帶機(jī)220220.851871118711187237418、9#11A,B皮帶機(jī)500220.854251142511425285010 A,B碎煤機(jī)560220.854761147611476295211 脫硫真空泵315220.85267.7511267.7511267.752535.512 分選風(fēng)機(jī)200440.851702234022340468013 A,B石灰石磨機(jī)1000220.8585011850118502170014 消防水泵3151100110P246924692938415 輸煤變壓器A,B20002216271116271116271162716 卸煤變壓器A,B25002223411123411123411234117 補(bǔ)給19、水升壓變A,B125011001111001111002220018 綜合水變A,B160013001113001113002260019 灰場(chǎng)小區(qū)升壓變A,B63017011170111702340P3653865389108工作段計(jì)算容量P2+0.8P3 (kVA)9922.49922.418492輸煤段計(jì)算電流 (A)909.3909.3序號(hào)名稱回路額定功率總臺(tái)數(shù)運(yùn)行方式及臺(tái)數(shù)換算系數(shù)單回計(jì)算功率#1A汽機(jī)變#1B汽機(jī)變重復(fù)負(fù)荷#2A汽機(jī)變#2B汽機(jī)變重復(fù)負(fù)荷#3A汽機(jī)變經(jīng)常不經(jīng)常#1A段#1B段#2A段#2B段#3A段連續(xù)短時(shí)斷續(xù)連續(xù)短時(shí)斷續(xù)安裝臺(tái)數(shù)計(jì)算臺(tái)數(shù)計(jì)算功率安裝臺(tái)數(shù)計(jì)算臺(tái)數(shù)計(jì)算20、功率安裝臺(tái)數(shù)計(jì)算臺(tái)數(shù)計(jì)算功率安裝臺(tái)數(shù)計(jì)算臺(tái)數(shù)計(jì)算功率安裝臺(tái)數(shù)計(jì)算臺(tái)數(shù)kW(kVA)臺(tái)(回)臺(tái)kVA臺(tái)kVA臺(tái)kVAkVA臺(tái)kVA臺(tái)kVAkVA臺(tái)1 水環(huán)式真空泵1601280.711222224111121121111211112#REF!112 主變通風(fēng)箱60840.742114211424211421142#REF!113 熱控汽機(jī)配電箱100840.770117011707011701170#REF!114 汽機(jī)MCC A/B590840.741311413114134131141311413#REF!115 凝結(jié)水精處理MCC162840.7113.411113.411113.411321、.411113.411113.4#REF!116 化水取樣加藥MCC35840.724.51124.51124.524.51124.51124.5#REF!117 110V直流充電電源25420.717.51117.51117.5#REF!11#REF!11#REF!#REF!118 UPS電源75420.752.51152.51152.5#REF!11#REF!11#REF!#REF!119 汽機(jī)通風(fēng)MCC130420.79111911191#REF!11#REF!11#REF!#REF!1110 儀用空壓機(jī)(公用)250620.71751117511175#REF!11#REF!11#RE22、F!#REF!1111 檢修空壓機(jī)(公用)250220.717512 凝結(jié)水輸送泵75420.752.51152.51152.5#REF!11#REF!11#REF!#REF!1112 鍋爐MCC A/B373420.7261.113 鍋爐熱控配電箱90220.54514 保安負(fù)荷85042185015 鍋爐通風(fēng)MCC A/B11242111216 鍋爐底渣MCC A/B151420.85 128.3517#19A/B皮帶機(jī)160210.711218 機(jī)組排水槽MCC90210.76319 冰水機(jī)234320.7163.820 煤倉(cāng)間暖通MCC274210.7191.821 煤倉(cāng)間MCC80223、10.75622 凝結(jié)水精處理再生系統(tǒng)MCC240110.716823 集控樓MCC320210.722424 保安負(fù)荷MCC850211850合計(jì)容量 (kVA)#REF!#REF!#REF!#REF!#REF!計(jì)算容量 (kVA)111911119111191選擇變壓器容量Se (kVA)3800038000380003800038000#3B汽機(jī)變重復(fù)負(fù)荷#4A汽機(jī)變#4B汽機(jī)變重復(fù)負(fù)荷#1(24)A鍋爐變#1(24)B鍋爐變重復(fù)負(fù)荷#1(24)A鍋爐變#1(24)B鍋爐變重復(fù)負(fù)荷#3B段#4A段#4B段#1(24)A段#1(24)B段#1(24)A段#1(24)B段計(jì)算功率安裝臺(tái)數(shù)計(jì)算24、臺(tái)數(shù)計(jì)算功率安裝臺(tái)數(shù)計(jì)算臺(tái)數(shù)計(jì)算功率安裝臺(tái)數(shù)計(jì)算臺(tái)數(shù)計(jì)算功率安裝臺(tái)數(shù)計(jì)算臺(tái)數(shù)計(jì)算功率安裝臺(tái)數(shù)計(jì)算臺(tái)數(shù)計(jì)算功率安裝臺(tái)數(shù)計(jì)算臺(tái)數(shù)計(jì)算功率安裝臺(tái)數(shù)計(jì)算臺(tái)數(shù)計(jì)算功率kVA臺(tái)kVAkVA臺(tái)kVA臺(tái)kVAkVA臺(tái)kVA臺(tái)kVAkVA臺(tái)kVA臺(tái)kVAkVA#REF!11#REF!#REF!11#REF!11#REF!#REF!1111211112#REF!#REF!11#REF!#REF!11#REF!11#REF!#REF!1142#REF!#REF!11#REF!#REF!11#REF!11#REF!#REF!11701170#REF!#REF!11#REF!#REF!11#REF!11#REF!#RE25、F!331239331239#REF!#REF!11#REF!#REF!11#REF!11#REF!#REF!11113.411113.4#REF!#REF!11#REF!#REF!11#REF!11#REF!#REF!1124.51124.5#REF!#REF!11#REF!#REF!11#REF!11#REF!#REF!11#REF!11#REF!#REF!#REF!11#REF!#REF!11#REF!11#REF!#REF!11#REF!#REF!#REF!11#REF!#REF!11#REF!11#REF!#REF!11#REF!11#REF!#REF!#REF!11#REF!#RE26、F!11#REF!11#REF!#REF!11#REF!11#REF!#REF!#REF!11#REF!#REF!11#REF!11#REF!#REF!22#REF!11#REF!#REF!11261.1#REF!110#REF!1145#REF!110#REF!11850#REF!110#REF!11112#REF!110#REF!11128.3511128.35#REF!110110#REF!1111211112#REF!110110#REF!11631163#REF!110110#REF!11163.811163.8#REF!110110#REF!11191.811191.8#REF!110110#REF!11561156#REF!110110#REF!11168#REF!110#REF!11224#REF!110#REF!11850#REF!110#REF!#REF!#REF!#REF!#REF!#REF!#REF!#REF!11191111911119138000380003800038000380003800038000#3A汽機(jī)變