三绕组变压器的短路容量计算
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短路容量计算
(1)110kV : 最大短路容量 m a x 1825d S M VA =;
最小短路容量 m i n 855d S M VA =;
110 kV :m in 6.630s X =Ω ; m i n 21.104s L m H =;
max 14.152s X =Ω
; m a x 45.047s L m H =;
10kV :min 0.0548s X =Ω ; m i n 0.1744s L m H =;
m a x 0.11696s X =Ω ; m a x 0.3723s L m H =;
6kV :m in 0.01973s X =Ω; m i n 0.0628s L m H =;
m a x 0.0421s X =Ω; m a x 0.1340s L m H = ;
(2) 3#主变: 6kV :2
6
0.10090.145325
T X =
⨯Ω=Ω;T 0.4625L m H = ;
(3) 1#或2#主变阻抗计算 11%(10.1
18.0
6.5)%
10.8%2
k u =
+-=; 21%(10.1 6.518.0)%0.7%2k u =+-=-;
31%(18.0 6.510.1)%7.2%
2
k u =
+-=;
10kV :2
110
0.1080.34331.5T X =
⨯Ω=Ω, 1 1.091T L m H =;
2
210
(0.007)0.02231.5T X =
⨯-Ω=-Ω, 20.0707T L m H =-;
2
310
0.0720.228631.5
T X =
⨯Ω=Ω; 30.728T L m H =;
6kV : 1360.1080.123431.5T X =⨯Ω=Ω
, 10.3929T L m H =; 236(0.007)0.00831.5T X =⨯-Ω=-Ω
, 20.0255T L m H =-;
336
0.0720.082331.5
T X =
⨯Ω=Ω
; 30.262T L m H =;
(5) 10kV 母线短路容量计算
计算等效电路如下图所示:
图中, m
a x
0.117s X =Ω ;min 0.0548s X =Ω ;
10.343T X =Ω
,20.022T X =-Ω,30.229T X =Ω 按照较大工况下,1#和2#主变6kV 出线功率计算R L 和X L (数据来源见典型波形与频
谱分析)
2S 3.400j1.046=+,
(单相功率) 1S 2.462j1.449=+, (单相功率)
我们用2S 计算R L 和X L
2
L 5.774R 9.8063.4
=Ω=Ω
, 2
L 5.774
X 31.8731.046
=Ω=Ω
由于L
L |R ||jX |远大于T 1X ,X s 等,故计算等效电路可以简化为
T 1T 2
m a x m a x
X X
0.117+0343002201170161082
s
X X +∴≈+=Ω
.-.=.+.=.43
m in 1002280.438
S M V A M V A
=
=;
m i n m i n
120.05480.343-0.022
0.376
s
T T X X X X ≈++=+=Ω; m ax 1004630.216
S M V A M V A =
=;
(6) 6kV I 段和II 段母线短路容量计算 计算等效电路如下图所示:
图中, m
a x
0.0421s X =Ω ;min 0.0197s X =Ω ;0.1453T X =Ω;
10.123
4T X =Ω;20.008T X =-Ω;30.0823T X =Ω; 按照较大工况下,1#和2#主变10kV 出线功率计算R L 和X L (数据来源见典型波形与频
谱分析)
2S 3.860j1.807=+,
(单相功率) 1S 4.276j1.090=+, (单相功率)
我们用1S 计算R L 和X L
2
L 3.464
R 2.8064.276=
Ω=Ω, 2
L 3.464
X 11.0091.090
=Ω=Ω
由于L L |R ||jX |远大于T 1X ,X s 等,故计算等效电路可以简化为
m a x =0.0421+0.1230.08230X ∴+Ω=.247 2
min 6
1460.247
S M VA M VA ==;
m i n
=0.01970.123
0.08230.225X ++=Ω;
2
max 6
1600.225
S M VA M VA =
=
6KV Ⅲ段短路容量计算
=0.04210.14530.1874sman T man X X X +=+=Ω
m in 361930.187
S M V A M V A
=
=
min =0.01970.14530.165sman T X X X +=+=Ω
m in 362180.165
S M V A M V A
=
=