電網(wǎng)10KV系統(tǒng)短路電流整定計算書

10KV電網(wǎng)短路電流計算,,,,,,,,,,

"假定電網(wǎng)短路容量為300MVA,基準電壓Uj=10KV,基準電流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|---2.0Km3X300電纜------10KV變配電所SS2|F1--------2.5Km3X185電纜--------F4|SS110/0.4KV變壓器|F5b|---SS210/0.4KV變壓器|F2|----0.8Km3X70電纜----10KV電機|F6b|----1.5Km3X70電纜----10KV電機|F3b|----------1.5Km3X185電纜--------F7|SS310/0.4KV變壓器|F8b|----1.0Km3X70電纜----10KV電機|F9,,,,,,,,,,

序號,電路元件,變壓器/電網(wǎng)容量SrT/SksMVA,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,折算到高壓側的短路電流(KA)

,,,,阻抗/Km,計算公式,短路元件電抗(標值),"I""s=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,進線電纜,YJV-3X300,2,0.079,X2*=L*X(Sj/Uj^2),0.143,,,,

短路點F1,SS210KV母線,,,,Xjs1*=X1*+X2*,0.477,19.218,209.80,48.91,

3,SS2變壓器(基準電壓10KV),0.63,,4.50%,X3*=(Uk%/100)*(Sj/SrT)*(0.4^2/10^2),0.0114,,,,

短路點F2,SS2變壓器低壓側,,,,Xjs2*=X1*+X2*+X3*,0.345,26.569,290.06,67.62,0.614

4,SS2-10KV電機,YJV-3X70,0.8,0.071,X4*=L*X(Sj/Uj^2),0.052,,,,

短路點F3,,,,,Xjs3*=X1*+X2*+X4*,0.528,17.343,189.34,44.14,

5,SS2-SS1電纜,YJV-3X185,2.5,0.063,X5*=L*X(Sj/Uj^2),0.143,,,,

短路點F4,SS110KV母線,,,,Xjs4*=X1*+X2*+X5*,0.620,14.786,161.42,37.63,

6,SS1變壓器(基準電壓10KV),0.25,,4.50%,X6*=(Uk%/100)*(Sj/SrT)*(0.4^2/10^2),0.0288,,,,

短路點F5,SS1變壓器低壓側,,,,Xjs5*=X1*+X2*+X5*+X6*,0.648,14.129,154.25,35.96,0.326

7,SS1-10KV電機,YJV-3X70,0.8,0.071,X7*=L*X(Sj/Uj^2),0.052,,,,

短路點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/Uj^2),0.086,,,,

短路點F7,SS310KV母線,,,,Xjs3*=X1*+X2*+X8*,0.562,16.289,177.82,41.46,

9,SS3變壓器(基準電壓10KV),0.5,,4.50%,X9*=(Uk%/100)*(Sj/SrT)*(0.4^2/10^2),0.0144,,,,

短路點F8,SS3變壓器低壓側,,,,xjs4*=X1*+X2*+X8*+X9*,0.577,15.882,173.38,40.42,0.367

10,SS3-10KV電機,YJV-3X70,0.8,0.071,X10*=L*