200MW机组 厂用电电源及馈线定值计算书文档格式.docx
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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-2500/6.3
2500
Dyn11
3
AN/AF
10.14%
6300
400
229.1
3608.5
380/100
60
1000
200
2006-045
2
#2输煤变(0B段)
10.20%
50
2006-054
#0输煤备用变(0A段)
10.17%
2006-050
4
#1电除尘变(1A段)
SGB11-R-2000/6.3
2000
9.99%
183.29
2886.8
2006-029
5
#2电除尘变(2A段)
9.80%
2006-030
6
电除尘备用变(0B段)
9.89%
2006-032
7
#1公用变(0A段)
SGB11-R-1600/6.3
1600
7.71%
146.6
2310
40
无
2006-066
8
#2公用变(0B段)
7.64%
2006-033
9
#1工业废水变(0A段)
7.79%
2309.4
2006-060
10
#2工业废水变(0B段)
7.74%
2006-037
11
#1工作厂变(1A段)
SGB11-R-1250/6.3
1250
5.96%
114.6
1804
2006-011
12
#2工作厂变(1B段)
6.05%
2006-024
13
#3工作厂变(2A段)
6.07%
2006-015
14
#4工作厂变(2B段)
5.99%
2006-012
15
#1厂前区变(0A段)
2006-023
16
#2厂前区变(0B段)
6.04%
2006-028
17
#1脱硫变(0A段)
SGR10-R-1250/6
AF
6.08%
1804.2
S2*******
18
#2脱硫变(0B段)
19
#1翻车机变(0A段)
SGB11-R-1000/6.3
91.7
1443
30
2006-007
20
#2翻车机变(0B段)
6.12%
2006-008
21
#1化水变(0A段)
SGB11-R-800/6.3
800
6.18%
73.3
1154.7
2006-002
22
#2化水变(0B段)
2006-001
23
#1照明变(1B段)
SGB11-R-500/6.3
500
4.13%
45.8
721.7
100
2006-031
24
#2照明变(2B段)
4.14%
2006-016
25
#0检修变(0B段)
4.06%
2006-022
第二章整定计算
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-200-2
2.2.1主要参数:
Se=235.3MVA;
Pe=200MW;
cosφ=0.85;
Xd"
=15.93%
2.2.2折算阻抗:
Xs=Xd"
×
Sj/Se=15.93%×
100/235.3=0.0677。
2.3#1、#2主变Xt1:
型号:
SFP10-240000/220
2.3.1主要参数:
Se=240MVAUd=13.1%
2.3.2折算阻抗:
Xt1=Ud×
Sj/Se=13.1%×
100/240=0.0542。
2.4#1、#2高厂变Xt2:
SFF9-CY-50000/15.75
2.4.1主要参数:
S=50MVAUd1-2=19%
2.4.2折算阻抗:
Xt1=Ud1-2×
Sj/Se=19%×
100/50=0.3783。
2.5高备变Xt0:
SFFZ9-CY-50000/220
2.5.1主要参数:
S=50MVAUd1-2=23%
2.5.2折算阻抗:
Sj/Se=23%×
100/50=0.4618。
2.7各厂变阻抗计算
1)#1#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:
X=Ud×
Sj/Se=Ud×
100/2.5=(#1:
4.056,#2:
4.080,#0:
4.068)
2)#1#2#0电除尘变SGB11-R-2000/6.3
Se=2000KVAUd=(#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SGR10-1250/6.3
Se=1250KVAUd=6.08%
Sj/Se=6.08%×
100/1.25=4.864
4)#1、#2公用变SGB11-R-1600/6.3
Se=1600KVA;
Ud=(#1:
7.71%,#2:
7.64%)
X=Ud×
100/1.6=(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)PC1APC1BPC2APC2B工作厂变SGB11-R-1250/6.3
Se=1250KVA;
Ud=(1A:
5.96%,1B:
6.05%,2A:
6.07%,2B:
5.99%)
100/1.25=(1A:
4.768,1B:
4.840,2A:
4.856,2B:
4.792)
7)#1、#2厂前区变SGB11-R-1250/6.3
5.99%,#2:
6.04%)
100/1.25=(#1:
4.792,#2:
4.832)
8)#1#2翻车机变SGB11-R-1000/6.3
Se=1000KVA;
6.04%,#2:
6.12%)
100/1.0=(#1:
6.04,#2:
6.12)
9)#1、#2化水变SGB11-R-800/6.3
Se=800KVA;
Ud=6.18%
Sj/Se=6.18%×
100/0.8=7.725
10)#1#2#0检修照明变SGB11-R-500/6.3
Se=500KVAUd=(#1:
4.13%,#2:
4.14%,#0:
4.06%)
100/0.5=(#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/(1.732×
Ujp)=100MVA/(1.732×
6.3KV)=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:
3.1.16KV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=19.335KA
6KV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+6.04=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∑=1.717KA
3.1.26KV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=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∑=1.390KA
#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∑=1.717KA
3.1.36KV1A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∑=1.777KA
#1电除尘变:
X∑=Xm+XT=0.39+4.995=5.469;
I(3)dmax=Ij/X∑=1.676KA
3.1.46KV1B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∑=1.060KA
3.1.56KV2A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=Ij/X∑=1.733KA
3.1.66KV2B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∑=1.057KA
3.2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:
3.2.16KV1A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=19.298KA
3.2.26KV1B段发生三相短路时
Xm=(0.0677+0.0542)//0.0147+0.0308+0.431=0.475;
3.2.36KV2A段发生三相短路时
3.2.46KV2B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:
3.3.16KV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=15.679KA。
3.3.26KVOA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=1.735KA
X∑=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∑=Xn+XT=0.506+4.869=5.375;
I(3)dmax=Ij/X∑=1.705KA;
I
(2)dmax=1.477KA
X∑=Xn+XT=0.506+7.725=8.231;
I(3)dmax=Ij/X∑=1.113KA;
I
(2)dmax=0.964KA
X∑=Xn+XT=0.506+6.040=6.546;
I(3)dmax=Ij/X∑=1.400KA;
I
(2)dmax=1.212KA
X∑=Xn+XT=0.506+4.056=4.562;
I(3)dmax=Ij/X∑=2.009KA;
I
(2)dmax=1.740KA
X∑=Xn+XT=0.506+4.86=5.366;
I(3)dmax=Ij/X∑=1.709KA;
I
(2)dmax=1.480KA
3.3.36KVOB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)dmax
X∑=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∑=