1、CT变比零序CT变比出厂编号高压低压1#1输煤变(0A段)SGB11-R-2500/6.32500Dyn113AN/AF10.14%6300400229.13608.5380/1006010002002006-0452#2输煤变(0B段)10.20%502006-054#0输煤备用变(0A段)10.17%2006-0504#1电除尘变(1A段)SGB11-R-2000/6.320009.99%183.292886.82006-0295#2电除尘变(2A段)9.80%2006-0306电除尘备用变(0B段)9.89%2006-0327#1公用变(0A段)SGB11-R-1600/6.316007
2、.71%146.6231040无2006-0668#2公用变(0B段)7.64%2006-0339#1工业废水变(0A段)7.79%2309.42006-06010#2工业废水变(0B段)7.74%2006-03711#1工作厂变(1A段)SGB11-R-1250/6.312505.96%114.618042006-01112#2工作厂变(1B段)6.05%2006-02413#3工作厂变(2A段)6.07%2006-01514#4工作厂变(2B段)5.99%2006-01215#1厂前区变(0A段)2006-02316#2厂前区变(0B段)6.04%2006-02817#1脱硫变(0A段)S
3、GR10-R-1250/6AF6.08%1804.2S2*18#2脱硫变(0B段)19#1翻车机变(0A段)SGB11-R-1000/6.391.71443302006-00720#2翻车机变(0B段)6.12%2006-00821#1化水变(0A段)SGB11-R-800/6.38006.18%73.31154.72006-00222#2化水变(0B段)2006-00123#1照明变(1B段)SGB11-R-500/6.35004.13%45.8721.71002006-03124#2照明变(2B段)4.14%2006-01625#0检修变(0B段)4.06%2006-022第二章 整定计算
4、一、短路计算1.系统短路计算接线图及正序阻抗图1.1系统接线图1.2系统阻抗图2.各元件阻抗计算2.1说明:2.1.1 根据短路计算原则,为方便短路计算取系统基准容量Sj=100MVA。2.1.2 系统阻抗(基准Sj=100MVA, Uj=230KV):大方式:X1max=0.0147,小方式:X1min=0.0381。2.2 #1、#2发电机Xs:型号:QFSN-200-22.2.1 主要参数:Se=235.3MVA;Pe=200MW;cos=0.85;Xd=15.93%2.2.2 折算阻抗:Xs=XdSj/Se=15.93%100/235.3=0.0677。2.3 #1、#2主变Xt1:
5、型号:SFP10-240000/2202.3.1 主要参数:Se=240MVA Ud=13.1%2.3.2折算阻抗:Xt1=UdSj/Se13.1%100/240=0.0542。2.4 #1、#2高厂变Xt2:SFF9-CY-50000/15.752.4.1 主要参数:S=50MVA Ud1-2=19% 2.4.2折算阻抗:Xt1=Ud1-2Sj/Se19%100/50=0.3783。2.5高备变Xt0:SFFZ9-CY-50000/2202.5.1 主要参数:S=50MVA Ud1-2=23% 2.5.2折算阻抗:Sj/Se23%100/50=0.4618。2.7 各厂变阻抗计算1)#1 #
6、2 #0输煤变SGB11-R-2500/6.3主要参数:Se=2500KVA;Ud=(#1:10.14%, #2:10.20%,#0:10.17%)折算阻抗:XUdSj/Se=Ud100/2.5=(#1:4.056, #2:4.080,#0:4.068)2)#1 #2 #0电除尘变SGB11-R-2000/6.3Se=2000KVA Ud=(#1:9.99%,#2:9.80%,#0:9.89%)Sj/Se=10%100/2=(#1:4.995,#2:4.900,#0:4.945)3)#1 #2脱硫变SGR10-1250/6.3Se=1250KVA Ud=6.08%Sj/Se=6.08%100/
7、1.25=4.8644)#1、#2公用变SGB11-R-1600/6.3Se=1600KVA; Ud=(#1:7.71%,#2:7.64%)X=Ud100/1.6=(1:4.819,2:4.775)5)#1、#2工业废水变SGB11-R-1600/6.3 7.79%,#2:7.74%)100/1.6=(#1:4.869,#2:4.838)6)PC1A PC1B PC2A PC2B工作厂变SGB11-R-1250/6.3Se=1250KVA;Ud=(1A:5.96%,1B:6.05%,2A:6.07%,2B:5.99%)100/1.25=(1A:4.768,1B:4.840,2A:4.856,2
8、B:4.792)7)#1、#2厂前区变SGB11-R-1250/6.35.99%,#2:6.04%)100/1.25=(#1:4.792,#2:4.832)8)#1 #2翻车机变 SGB11-R-1000/6.3Se=1000KVA;6.04%,#2:6.12%)100/1.0=(#1:6.04,#2:6.12)9)#1、#2化水变SGB11-R-800/6.3Se=800KVA;Ud=6.18%Sj/Se=6.18%100/0.8=7.72510)#1 #2 #0检修照明变SGB11-R-500/6.3Se=500KVA Ud=(#1:4.13%, #2:4.14%,#0:4.06%)100
9、/0.5=(#1:8.260, #2:8.280,#0:8.120)3.短路电流计算说明:取6KV基准电流Ij=Sj/(1.732Ujp)=100MVA/(1.7326.3KV)=9.165KA,计算6KV段各点短路电流。3.1系统最大运行方式下,#1 #2机组运行带各自厂用电负荷运行,启备变带公用段负荷运行时,6KV各点发生三相短路时的短路电流计算:3.1.1 6KV公用OA段发生三相短路时Xm=0.0147/(0.0542+0.0677)/2+0.431+0.0308=0.474;I(3)dmax=Ij/Xm=19.335KA6KV公用OA段厂变低压侧母线上发生三相短路时,流过保护安装处的
10、短路电流是:输煤备用变:X=Xm+XT=0.474+4.068=4.542,I(3)dmax=Ij/X=2.017KA#1厂前区变:X=Xm+XT=0.474+4.792=5.266,I(3)dmax=Ij/X=1.740KA#1主厂房公用变:X=Xm+XT=0.474+4.819=5.293,I(3)dmax=Ij/X=1.732KA#1工业废水变:X=Xm+XT=0.474+4.869=5.343,I(3)dmax=Ij/X=1.715KA#1化水变:X=Xm+XT=0.474+7.725=8.199,I(3)dmax=Ij/X=1.118KA#1翻车机变:X=Xm+XT=0.474+6.
11、04=6.514,I(3)dmax=Ij/X=1.407KA#1输煤变:X=Xm+XT=0.474+4.056=4.53,I(3)dmax=Ij/X=2.023KA#1脱硫变:X=Xm+XT=0.474+4.864=5.34,I(3)dmax=Ij/X=1.717KA3.1.2 6KV公用OB段发生三相短路时(与OA段情况相同)Xm=0.474;I(3)dmax=Ij/Xm=19.335KA。6KV公用OB段厂变低压侧母线发生三相短路时,流过保护安装处的短路电流是:检修变:X=Xm+XT=0.474+8.120=8.594,I(3)dmax=Ij/X=1.066KA电除尘备用变X=Xm+XT=
12、0.474+4.945=5.419,I(3)dmax=Ij/X=1.691KA#2厂前区变X=Xm+XT=0.474+4.832=5.306,I(3)dmax=Ij/X=1.727KA#2主厂房公用变X=Xm+XT=0.474+4.775=5.249,I(3)dmax=Ij/X=1.746KA#2工业废水变X=Xm+XT=0.474+4.838=5.312,I(3)dmax=Ij/X=1.725KA#2化水变X=Xm+XT=0.474+7.725=8.199,I(3)dmax=Ij/X=1.118KA#2翻车机变X=Xm+XT=0.474+6.120=6.594,I(3)dmax=Ij/X=1
13、.390KA#2输煤变X=Xm+XT=0.474+4.080=4.554,I(3)dmax=Ij/X=2.013KA#2脱硫变X=Xm+XT=0.474+4.864=5.34,I(3)dmax=Ij/X=1.717KA3.1.3 6KV1A段发生三相短路时Xm=0.0147/(0.0677+0.0542)+0.0542/0.0677+0.353+0.0253=0.39;I(3)dmax=Ij/Xm=9.165/0.39=23.5KA低厂变低压侧母线上发生三相短路时,流过保护安装处的短路电流是:#1主厂房工作变1A:X=Xm+XT=0.39+4.768=5.158;I(3)dmax=Ij/X=1
14、.777KA #1电除尘变:X=Xm+XT=0.39+4.995=5.469;I(3)dmax=Ij/X=1.676KA3.1.4 6KV1B段发生三相短路时#2主厂房工作变1B:X=Xm+XT=0.39+4.840=5.23;I(3)dmax=Ij/X=1.752KA#1照明变:X=Xm+XT=0.39+8.260=8.65;I(3)dmax=Ij/X=1.060KA3.1.5 6KV2A段发生三相短路时#3主厂房工作变2A:X=Xm+XT=0.39+4.856=5.246;I(3)dmax=Ij/X=1.747KA#2电除尘变:X=Xm+XT=0.39+4.9=5.29;I(3)dmax=
15、Ij/X=1.733KA3.1.6 6KV2B段发生三相短路时#4主厂房工作变2B:X=Xm+XT=0.39+4.792=5.18;I(3)dmax=Ij/X=1.768KA#2照明变:X=Xm+XT=0.39+8.280=8.67;I(3)dmax=Ij/X=1.057KA3.2 系统最大运行方式下,#1 #2机组停运,启备变带公用段负荷及#1或#2机厂用电负荷运行时,6KV段各点发生三相时的短路电流计算:3.2.1 6KV1A段发生三相短路时Xm=(0.0677+0.0542)/0.0147+0.0308+0.431=0.475 I(3)dmax=Ij/Xm=19.298KA3.2.2 6
16、KV1B段发生三相短路时Xm=(0.0677+0.0542)/0.0147+0.0308+0.431=0.475;3.2.3 6KV2A段发生三相短路时3.2.4 6KV2B段发生三相短路时3.3系统最小运行方式下,#1 #2机组停运,启备变带公用段负荷及#1或#2机厂用电负荷运行时,6KV段各点发生三相/两相短路和两相短路时的短路电流计算:3.3.1 6KV高压侧各母线段发生三相(两相)短路时母线上的短路电流是:阻抗标么值:Xn=X1+XT0=0.0381+0.4618=0.506;I(3)dmax=Ij/Xn=18.105KA,I(2)dmax=(3/2)*I(3)dmax=15.679K
17、A。3.3.2 6KV OA段厂变低压侧母线上发生三相(两相)短路时,流过保护安装处的短路电流是:I(3)dmax=Ij/(Xn+Xt);I(2)dmax=(3/2)*I(3)dmax。X=Xn+XT=0.506+4.068=4.574;I(3)dmax=Ij/X=2.004KA;I(2)dmax=1.735KAX=Xn+XT=0.506+4.792=5.298;I(3)dmax=Ij/X=1.730KA;I(2)dmax=1.498KA#1公用变:X=Xn+XT=0.506+4.819=5.325;I(3)dmax=Ij/X=1.721KA;I(2)dmax=1.490KA#1废水变:X=X
18、n+XT=0.506+4.869=5.375;I(3)dmax=Ij/X=1.705KA;I(2)dmax=1.477KAX=Xn+XT=0.506+7.725=8.231;I(3)dmax=Ij/X=1.113KA;I(2)dmax=0.964KAX=Xn+XT=0.506+6.040=6.546;I(3)dmax=Ij/X=1.400KA;I(2)dmax=1.212KAX=Xn+XT=0.506+4.056=4.562;I(3)dmax=Ij/X=2.009KA;I(2)dmax=1.740KAX=Xn+XT=0.506+4.86=5.366;I(3)dmax=Ij/X=1.709KA;
19、I(2)dmax=1.480KA3.3.3 6KV OB段厂变低压侧母线上发生三相(两相)短路时,流过保护安装处的短路电流是:I(2)dmax=(3/2)*I(3)dmaxX=Xn+XT=0.506+8.120=8.626;I(3)dmax=Ij/X=1.062KA;I(2)dmax=0.920KA除尘备变:X=Xn+XT=0.506+4.945=5.451;I(3)dmax=Ij/X=1.681KA;I(2)dmax=1.456KA#2厂前区变:X=Xn+XT=0.506+4.832=5.338;I(3)dmax=Ij/X=1.717KA;I(2)dmax=1.487KA#2公用变:X=Xn+XT=0.506+4.775=5.281;I(3)dmax=Ij/X=1.735KA;I(2)dmax=1.503KA#2废水变:X=Xn+XT=0.506+4.838=5.344;I(3)dmax=Ij/X=1.715KA;I(2)dmax=1.485KA#2化水变:#2翻车机变:X=
copyright@ 2008-2022 冰豆网网站版权所有
经营许可证编号:鄂ICP备2022015515号-1