低压柴油发电机组配电系统短路电流计算

=0.916
219.4
I″k= 0.916 √ 0.00122+0.00472
=49385.5A
ip
ip=κ√2 I″k
κ
0.0012
1.02+0.98e-3Rk/Xk=1.02+0.98e-3 0.0047
=1.02+0.98 0.46=1.47
ip=1.47√2 49385.5=102707.6A
Ib
Ib=µI″k
tmin=0.02s µ=0.8436 Ib=0.8436
tmin=0.05s µ=0.7136 Ib=0.7136
tmin=0.10s µ=0.6236 Ib=0.6236
2.3
F3
49303=41592A 49303=35183A 49303=30745A
I″k=
cUn √3 ZK
=√
Hale Waihona Puke Baidu
1 3
380 0.0047
=46680A
ip
ip=κ√2 I″k
κ
1.02+0.98e-3Rk/Xk=1.02+0.98e-3
0.0014 0.00447
=1.4
ip=1.4√2 46680=92408A
Ib
Ib=µI″k
tmin=0.02s µ=0.8436 Ib=0.8436 46680=39379A
RG=0.0013Ω
x″d =0.061 I-LI N E 4 0 0 0 A
ro=0.013mΩ/m
xo=0.003mΩ/m
2.1
F1
I″k
√ I″k=
cUn √3 Zk
=√3
cUn
R
2 k
+Xk2
=
1 380
= 219.4
1.732 √(KGRG)2+(KGX″d )2 KG√RG2+X″d 2
Zk= √0.00142+0.004472 =0.0047Ω
I″k
I″k
ip Ib
cUn/√3
万方数据
大型数据中心低压柴油发电机组配电系统短路电流计算
作者： 作者单位： 刊名：
英文刊名： 年，卷(期)： 引用次数：
王玉卿， 王振声， 王莉， Wang Yuqing， Wang Zhensheng， Wang Li 中国建筑设计研究院
Ib
Ib=µI″k tmin=0.02s
µ=0.84+0.26e-0.26I″k G/IrG=0.84+0.26e-0.26
49385.5 3013
=0.8436
Ib=0.8436 tmin=0.05s
49385.5=41661A
µ=0.71+0.51e-0.30I″k G/IrG=0.71+0.51e-0.30
Zk
√ ZK=
R
2 k
+X2k
ip = κ√2I″k κ 1.02+0.98e-3Rk/Xk
Ib=µI″k
µ
tmin I″k/IrG
tmin=0.02s µ=0.84+0.26e -0.26I″kG/IrG
tmin=0.05s µ=0.71+0.51e-0.30I″kG/IrG
tmin=0.10s µ=0.62+0.72e-0.32I″kG/IrG
Special Features
February 2007 Vol.1 No.1
Short-circuit Current Calculation of Low-voltage Diesel Generating Set of Distribution System for IDC
By Wang Yuqing, Wang Zhensheng and Wang Li
0.9 0.17
.1.Irm
=7.5Irm
0.9 0.17
ip ipΣ=ip+ipm
I″k=I″kp+I″kpm
ipm I″k
2
3m
3 KOHLER 7M4058
I-LINE 4000A 20mI-LINE 4000A
U rG= 4 0 0 V ,
PrG=1670kW
cosϕ=0.8
Un=380V
1.4
I″k
i p
I″k=nI″k1
ip=nip1
n
I″k1
ip1
1.5
a. b.
1% c.
0.01s
Lm
Q
万方数据
Special Features
February 2007 Vol.1 No.1
mm2
L/Q 0.05
ipm= √2
E*d X*d
.Kpm.Irm
E*d
X*d
Kpm
1.0
Irm
ipm= √2
智能建筑电气技术 ELECTRICAL TECHNOLOGY OF INTELLIGENT BUILDINGS 2007，1(1) 0次
参考文献(2条) 1.国家质量技术监督局 GB/T 15544-1995.三相交流系统短路电流计算 1995 2.王振声.王玉卿 35～6/0.4kV配变电系统短路电流计算实用手册 2004
tmin=0.05s Ib=3 33311A=99933A=100kA
tmin=0.10s Ib=3 29110A=87330A=87.3kA
2.5
F5
E
~
RL=roL=0.013 23=0.3mΩ XL=xoL=0.008 23=0.19mΩ Rk=KGRG+RL=0.916 0.0012+0.0003=0.0014Ω Xk=KGX″d+XL=0.916 0.0047+0.000024=0.0043Ω
Ib=0.6236 49385.5=30796A
2.2
F2
RL=roL=0.013 3=0.039mΩ
XL=xoL=0.008 3=0.024mΩ
Rk=KGRG+RL=0.916 0.0012+0.000039=0.001138Ω
Xk=KGX″d+XL=0.916 0.0047+0.000024=0.0043Ω
Abstract The paper introduces the calculation of short-circuit current of diesel generating set and power supply and distribution system, and expounds the calculation method and formula. Various short-circuit parameters have been calculated in combination with the front-end of diesel generator power supply and distribution system of a Data Center which is give a reference to the readers. Keywords equivalent voltage source, the initial value of symmetric short-circuit current, short-circuit current crest, symmetric short-circuit capacity
I″k
√ I″k=
cUn √3 Zk
=√3
cUn R 2k+Xk2
=
√
3
1 380 √0.0011382+0.00432
=49303A
ip
ip=κ√2 I″k
κ
1.02+0.98e-3Rk/Xk=1.02+0.98e-3
=1.465 0.001138 0.0043
ip=1.465√2 49303=102132A
本文链接：http://d.wanfangdata.com.cn/Periodical_znjzdqjs200701006.aspx
下载时间：2009年11月24日
UrG/√3
Cmax
RG
X″d
X″d
=
UrG . √3IrG
X″d=
ZrG.
x″d
1.2
√3IrG
RL=roL
XL=xoL
L
ro xo 1.3
1.00 Ω
Ω
m mΩ/m mΩ/m
√ I″k=
cUn √3 Zk
=√3
cUn
R
2 k
+Xk2
cUn/ √ 3
Rk
Rk=KGRG+RL
Xk
Xk=KGX″d+XL
1
1.1
√ ZGK=KGZG=KG RG+X″d2
KG=
Un UrG
cmax 1+ xd″sinϕrG
Un
380V
UrG
400V
ZGK
x″d
x″d =X″d /ZrG
Electrical Technology of Intelligent Buildings
万方数据
2007 2
1
1
ϕrG
IrG
RG=0.0012Ω
x″d =0.061
X″d =
UrG √3 IrG
. x″d
I=
PrG
rG cosϕUrG. √ 3
= 1670 1000 0.8 400 √3
= 3013A
X″d= √3
400 3013
.0.061=0.0047Ω
KG= UG UrG
cmax = 380
1
1+x″dsinϕrG 400 1+0.061 0.6
49385.5 3013
=0.7136
Ib=0.7136 49385.5=35241A
Electrical Technology of Intelligent Buildings
万方数据
2007 2
1
1
tmin=0.10s
49385.5
µ=0.62+0.72e-0.32I″k G/IrG=0.62+0.72e-0.32 3013 =0.6236
tmin=0.05s µ=0.7136 Ib=0.7136 46680=33311A
tmin=0.10s µ=0.6236 Ib=0.6236 46680=29110A
2.4
F4
I″k
I″k=3 I″kF3=3 46680=140043A
ip
ip=3iPF3=3 92408=277224A
Ib
tmin=0.02s Ib=3 39319A=118137A=118kA