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1、......一、主運(yùn)帶巷機(jī)電硐室移動(dòng)變電站的整定計(jì)算(一)、移動(dòng)變電站高壓饋電開關(guān)的過載保護(hù)整定負(fù)荷統(tǒng)計(jì):∑PN=340KW1)、長時(shí)工作電流:Ica=Kde∑PN/(√3VNcosΦwm)=0.54*340/(1.732*6.3*0.85)=19.8A確定整定值Ise=1.2*Ica.=1.2*19.8≈23.8A2)、短路保護(hù)整定由過載保護(hù)確定短路保護(hù)整定值Isb.r=(1.2~1.4)*(Ist.m+∑IN)=1.4*(22+19)=41A3)、靈敏度的校驗(yàn)a系統(tǒng)電抗值XSY=V2ar/SS=0.692/800=0.000595ΩbUGSP3*501460m電
2、纜的電阻R1和電阻X1R1=R01L1/K2SC=0.1*1.46/(6/0.69)2=0.002ΩX1=X01*L1/K2SC=0.06*1.46/(6/.69)2=0.001Ωc變壓器的電阻和電抗值ZT=vsV2ar.T/(100SN.T)=4.43*0.692/(100*0.63)=0.0334ΩRT=△pN.TV2ar.T/S2N.T=4000×0.692/8002=0.005ΩXT=√ZT2-R2T=√0.03342-0.0052=0.0331Ω.專業(yè)專注.......△pN.T:變壓器功率損耗,4000Wvs(%):變壓器的阻抗電壓百分?jǐn)?shù),4.43(%)
3、dUPQ–1.143*701400m電纜的電阻R3和電阻X3R2=R03L3=0.267*1.4=0.3738ΩX2=X03*L3=0.078*1.4=0.1092ΩeUP–1.143*1610m電纜的電阻R3和電阻X3R3=R03L=1.16*0.01=0.0116ΩX3=X03*L=0.090*0.01=0.0009Ω最遠(yuǎn)點(diǎn)電機(jī)機(jī)的三相短路電流I(3)d=Var/(√3*√ΣR2+ΣX2)=690/(1.732*√0.39932+0.13472)=945A兩相短路電流I(2)d=0.87*Id(3)=0.87*945=822Af靈敏度校驗(yàn)Kr=I(2)d/Isb
4、=822/41=20>1.2符合要求(二)、移動(dòng)變電站低壓饋電開關(guān)的過載保護(hù)整定1)、長時(shí)工作電流:Ica=Kde∑PN/(√3VNcosΦwm)=0.54*340/(1.732*0.69*0.85)=180A確定整定值Ise=1.2*Ica.=1.2*106≈216A2)、短路保護(hù)整定由過載保護(hù)確定短路保護(hù)整定值Isb.r=(1.2~1.4)*(Ist.m+∑IN.專業(yè)專注.......)=1.2*(169+160)=329A3)、靈敏度的校驗(yàn)a系統(tǒng)電抗值XSY=V2ar/SS=0.692/800=0.000595ΩbUGSP3*501460m電纜的電阻R1和電阻
5、X1R1=R01L1/K2SC=0.1*1.46/(6/0.69)2=0.002ΩX1=X01*L1/K2SC=0.06*1.46/(6/.69)2=0.001Ωc變壓器的電阻和電抗值ZT=vsV2ar.T/(100SN.T)=4.43*0.692/(100*0.63)=0.0334ΩRT=△pN.TV2ar.T/S2N.T=4000×0.692/8002=0.005ΩXT=√ZT2-R2T=√0.03342-0.0052=0.0331Ω△pN.T:變壓器功率損耗,4000Wvs(%):變壓器的阻抗電壓百分?jǐn)?shù),4.43(%)dUPQ–1.143*701400m電纜的
6、電阻R3和電阻X3R2=R03L3=0.267*1.4=0.3738ΩX2=X03*L3=0.078*1.4=0.1092ΩeUP–1.143*1610m電纜的電阻R3和電阻X3R3=R03L3=1.16*0.01=0.0116ΩX3=X03*L3=0.090*0.01=0.0009Ω最遠(yuǎn)點(diǎn)電機(jī)機(jī)的三相短路電流I(3)d=Var/(√3*√ΣR2+ΣX2).專業(yè)專注.......=690/(1.732*√0.39932+0.13472)=945A兩相短路電流I(2)d=0.87*Id(3)=0.87*945=822Af靈敏度校驗(yàn)Kr=I(2)d/Isb=822/32
7、9=2.5>1.2符合要求二、主運(yùn)帶移變饋電、開關(guān)整定計(jì)算1、控制主運(yùn)皮帶機(jī)的KJ25-400饋電整定計(jì)算(1)短路保護(hù)整定Isb≥Ist.m+∑IN=5*185+330=515A(2)靈敏度校驗(yàn)aXSY=V2ar/SS=0.692/800=0.000595ΩbUGSP3*9560m電纜的電阻R1和電阻X1R1=R01L1/K2SC=0.1*0.046/(6/0.69)2=0.002ΩX1=X01*L1/K2SC=0.06*0.046/(6/.69)2=0.001Ωc變壓器的電阻和電抗值ZT=vsV2ar.T/(100SN.T)=4.43*0.692/(100*