10KV系統(tǒng)短路電流整定計(jì)算表格

1、10KV電網(wǎng)短路電流計(jì)算,假定電網(wǎng)短路容量為300MVA,基準(zhǔn)電壓Uj=10KV,基準(zhǔn)電流Ij=9.16KA,沖擊系數(shù)Kch.s取1.8. 各元件有效電阻較小,短路電路中總電阻不大于總電抗的1/3,不予考慮.,10KV|-2.0Km 3X300電纜-10KV變配電所SS2 |F1-2.5Km 3X185電纜-F4|SS1 10/0.4KV變壓器|F5 b |-SS2 10/0.4KV變壓器|F2 |- 0.8Km 3X70電纜-10KV電機(jī)|F6 b |-1.5Km 3X70電纜-10KV電機(jī)|F3 b |-1.5Km 3X185電纜-F7|SS3 10/0.4KV變壓器|F8 b |-1.0

2、Km 3X70電纜-10KV電機(jī)|F9,序號(hào),電路元件,變壓器/電網(wǎng)容量SrT/Sks MVA,電纜長度Km,變壓器Uk%,短路電路總電抗Xjs,超瞬變短路電流KA,短路容量MVA,短路全電流KA,折算到高壓側(cè)的短路電流(KA),阻抗/Km,計(jì)算公式,短路元件電抗(標(biāo)值),Is=I0.2=Ik= Ij/Xjs*,Ss= Sj/Xjs*,ich.s= 1.414*Kch.s*I,I1= I2/(1.732*nl)1,電網(wǎng),300,10,X1*=Sj/Sks,0.333 ,2,進(jìn)線電纜,YJV-3X300,2,0.079,X2*=L*X(Sj/Uj2),0.143 ,短路點(diǎn)F1,SS2 10KV母

3、線,Xjs1*=X1*+X2*,0.477 ,19.218 ,209.80 ,48.91 ,3,SS2變壓器(基準(zhǔn)電壓10KV),0.63,4.50%,X3*=(Uk%/100)*(Sj/SrT)*(0.42/102),0.0114 , ,短路點(diǎn)F2,SS2變壓器低壓側(cè),Xjs2*=X1*+X2*+X3*,0.345 ,26.569 ,290.06 ,67.62 ,0.614 4,SS2-10KV電機(jī),YJV-3X70,0.8,0.071,X4*=L*X(Sj/Uj2),0.052 ,短路點(diǎn)F3,Xjs3*=X1*+X2*+X4*,0.528 ,17.343 ,189.34 ,44.14 ,

4、5,SS2-SS1電纜,YJV-3X185,2.5,0.063,X5*=L*X(Sj/Uj2),0.143 ,短路點(diǎn)F4,SS1 10KV母線,Xjs4*=X1*+X2*+X5*,0.620 ,14.786 ,161.42 ,37.63 ,6,SS1變壓器(基準(zhǔn)電壓10KV),0.25,4.50%,X6*=(Uk%/100)*(Sj/SrT)*(0.42/102),0.0288 ,短路點(diǎn)F5,SS1變壓器低壓側(cè),Xjs5*=X1*+X2*+X5*+X6*,0.648 ,14.129 ,154.25 ,35.96 ,0.326 7,SS1-10KV電機(jī),YJV-3X70,0.8,0.071,X7

5、*=L*X(Sj/Uj2),0.052 ,短路點(diǎn)F6,Xjs3*=X1*+X2*+X5*+X7*,0.671 ,13.651 ,149.03 ,34.74 ,8,SS2-SS3電纜,YJV-3X185,1.5,0.063,X8*=L*X(Sj/Uj2),0.086 ,短路點(diǎn)F7,SS3 10KV母線,Xjs3*=X1*+X2*+X8*,0.562 ,16.289 ,177.82 ,41.46 ,9,SS3變壓器(基準(zhǔn)電壓10KV),0.5,4.50%,X9*=(Uk%/100)*(Sj/SrT)*(0.42/102),0.0144 ,短路點(diǎn)F8,SS3變壓器低壓側(cè),xjs4*=X1*+X2*+X8*+X9*,0.577 ,15.882 ,173.38 ,40.42 ,0.367 10,SS3-10KV電機(jī),YJV-3X70,0.8,0.071,X10*=L*X(Sj/Uj2),0.052 ,短路點(diǎn)F9,Xjs3*=X1