光伏电站短路电流计算书.docx

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1、XXXXXX光伏发电工程短路电流计算书审查:校核:编写:一、工程概况XXXXXXX光伏发电工程总装机50MWp,海拔高度约为5m。本工程建成后出1回llOkV线路接入1XXXXX变UOkV侧。线路长约5.1km,选用LGJ-3OO型导线，变压器分列运行。二、技术参数KllOkV线路侧短路电流Imax=5.23kA2、主变压器B容量SBi=50000kVA,Uk=10.5%,110/35kV3、35kV厂变B2容量SBi=160kVA,Uk=6%,35/0.4kV4、SVG变压器B3容量SB】=10000kVA,Uk=7.5%,35/10kV5、联合单元箱式变压器BN容量SBN=1000kVA（

2、分裂变压器），Uk=6.5%,36.75/0.315/0.315kV,分裂系数Kf=3.5,半穿越阻抗X2=12%常用基准值：Uj(kV)1153710.50.40.315L(kA)0.51.565.5144.30183.29三、系统阻抗图o迸硼梏单元四、短路电流计算(1)已知系统短路电流lx皿=5.23kAXx*=L/Ixmax=O.5/5.23=0.0956线路采用LGJ-300导线，线路电抗取XI=0.41=5.1kmXl*=X*Sj/Uj2=0.4*5.l*100/115J0.0154X*=0.0956+0.0154=0.Illk1短路电流Ikl=Ij/X*=0.5/0.111=4.5

3、kA(2)主变压器BXbi=Uk%/100X100/Sbi=10.5/100X100/50=0.21则k2点短路电流为:Ik2=Ij/(x*+Xbi)=1.56/(0.111+0.21)=4.86kA35kV厂变B2XB2=Uk%/100X100/Sb2=6/100X100/0.16=37.5则kz点短路电流为：IkB2=Ij/(X*+Xbi)=144.30/(0.111+0.21+37.5)=3.815kA(4)SVG变压器风Xb3=U%/100X100/SB2=7.5/100X100/10=0.75则k：,点短路电流为：IkB3=Ij/(x*+Xbi)=5.5/(0.111+0.21+0.

4、75)=5.135kA(4)联合单元箱式变压器Bn阻抗图Xl-2=Xl-2/(l+Kf/4)=12%/(l+3.5/4)=6.4%Xf=KfXl-2=3.5X6.4%=22.4%则低压侧两支路电抗分别为：X2=X2=l/2Xf=l/2X22.4%=11.2%高压侧支路电抗为：Xl=(1-Kf/4)Xl-2=(1-3.5/4)X6.4%=0.8%折合到100MVAXl=0.8%X100/1=0.8,X2=ll.2%X100/1=11.2仅考虑单一支路短路时短路电流为：IkBN=Ij/(X*+Xb1+Xi+X2)=183.29/(0.111+0.21+0.8+11.2)=14.876kA表6-1短路电流计算结果表短路点母线名称三相短路电流（kA）XXXX变UOkV母线5.23XXXX光伏电站UOkV母线K14.5XXXX光伏电站35kV母线K24.86XXXX光伏电站35kV厂变低压侧KB23.815XXXX光伏电站SVG变低压侧KB35.135XXXXX光伏电站箱变低压侧KBN14.876