VA循环功率
Sc

VAVBVN
Z


1051041017017j038

33943017

j038kVA580
j129kVA
SAC
1290104722003
17
j17609257
j12003Sc
158278j93685580j129216278j106585kVA
SBD

117
29010410
2200
14

j176092510

j1200
14Sc
351826j202407580j129293826j189507kVA
SACSBD216278j106585293826j189507510104j296092kVA
SCSD290104j17609252200j1200510104j296092kVA
SCDSBDSD293826j1895072200j120073826j69507kVAC点为功率分点，可推算出E点为电压最低点。进一步可求得E点电压
21621072
SAC
102
17j38MVA9878j2208kVA
S
AC

216278

j106585
9878

j2208

226156

j128665kVA
VAC

2261712938105

08328kV
VCVAVAC1050832896672kV
VCE

03010901610896672
0041kV
VEVCVCE96672004196262kV
34图所示110kV闭式电网，A点为某发电厂的高压母线，其运行电压为117kV。网络各组件参数为：
f变电所bSN20MVA，S0005j06MVA，RT484，XT635
变电所cSN10MVA，S0003j035MVA，RT114，XT127
负荷功率SLDb24j18MVA，SLDc12j9MVA试求电力网络的功率分布及最大电压损耗。
解（1）计算网络参数及制定等值电路。
线路Ⅰ：Z027j042360162j2538
B26910660S161104S
2QB1611041102Mvar195Mvar
线路Ⅱ：Z027j042350135j2115
B26910650S135104S
2QB1351041102Mvar163Mvar
线路Ⅱ：Z045j0444018j176
B25810640S103104S
2QB1031041102Mvar125Mvar
变电所
b：ZTb

1484
2
j635
242
j3175
S0b2005j06MVA01j12MVA
变电所
b：ZTc

1114
2
j127
57
j635
S0c2003j035MVA006j07MVA
等值电路如图所示（2）计算节点b和c的运算负荷。
STb

2421821102
224

j3175MVA

018
j236MVA
SbSLDbSTbSobjQBIjQB24j18018j23601j12j0975j0623M2428j1996MVA
STc
122921102
57
j635MVA

0106

j118MVA
fScSLDcSTcSocjQBjQB12j90106j118006j07j0623j0815MVA1217j944MVA
（3）计算闭式网络的功率分布。
S

Sb
Z


Z



S
c
Z

Z


Z


Z



2428
j1996315
j38751217
477j6413
j944135
j2115MV
1864j1579MVA
S

Sc
Z

Z


Z



Sb
Z


Z


Z



1217
j1944342
j42982428
477j6413
j1996162
j2538MVA
178j136MVA
SIS1864j1579178j136MVA3644j2939MVA
SbSc2428j19961217j944MVA3645j294MVA
可见，计算结果误差很小，无需重算。取S1864j1579MVA继续进行计算。
SSbS2428j19961865j158MVA563j416MVA
由此得到功r