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1、220kV不分段運行,上#1主變一系統(tǒng)參數(shù) 500kV Z1=0.0044695, Z0=0.0048689 220kV Z1=0.0100612, Z0=0.0126255 SB=100MVA, VB=525/230 kV二 變壓器阻抗標(biāo)么值1. 變壓器短路電抗 UK1-2=14%，UK1-3=55%，UK2-3=40%2. 變壓器阻抗標(biāo)么值 X1=(14%+55%-40%)/2×100/10000.0145 X2=(14%+40%-55%)/2×100/10000 X3=(55%+40%-14%)/2×100/10000.04053. 站用變阻抗標(biāo)么值 Xk=

2、 Uk×100/0.636.5×100/0.63=10.317三 三相對稱短路等值電流1. 等值電路2. (1) 500 kV母線短路X=0.0044695/(0.0100612+0.0145)=0.0037814Id0.11/ X=0.11/0.003781429.09kAIch1.52 Id =1.52×29.0944.22kAich2.55 Id =2.55×9.9174.18kA (2) 220 kV母線短路X=0.0100612/(0.0044695+0.0145)=0.006574Id0.251/ X=0.251/0.00657438.18k

3、AIch1.52 Id =1.52×38.1858.03kA ich2.55 Id =2.55×38.1897.36kA (3) 35 kV母線短路X=(0.0044695+0.0145)/0.0100612+0.0405=0.047074Id1.56/ X=1.56/0.04707433.14kAIch1.52 Id =1.52×33.1450.37kA ich2.55 Id =2.55×33.1484.51 kA (4) 380V母線短路X=(0.0044695+0.0145)/0.0100612+0.0405+10.317=10.364Id144.

4、34/ X=144.34/10.36413.93kAIch1.52 Id =1.52×13.9321.17kAich2.55 Id =2.55×13.9335.51 kA四. 單相接地短路電流1. 等值電路見下圖 2. 母線單相短路電流(1) 500 kV母線短路 X10.0037814 X0(0.0126255/0.0405+0.0145)/0.0048689=0.004051Id0.11×3/(2×X1+ X0)=0.33/(2×0.0037814+0.004051)28.41kA(2) 220 kV母線短路 X10.006574 X0(0

5、.0048689+0.0145)/0.0405/0.0126255 =0.0064298Id0.251×3/(2×X1+ X0)=0.753/(2×0.006574+0.0064298)38.46 kA220kV分段運行, #1主變接入I母，#3主變接入II母一系統(tǒng)參數(shù) 500kV Z1=0.0044695, Z0=0.0048689 220kV I母：Z1=0.0124864, Z0=0.0186741 II母：Z1=0.0115956, Z0=0.0174469 SB=100MVA, VB=525/230 kV二 變壓器阻抗標(biāo)么值 X1=(14%+55%-40

6、%)/2×100/10000.0145 X2=(14%+40%-55%)/2×100/10000 X3=(55%+40%-14%)/2×100/10000.0405站用變阻抗標(biāo)么值 Xk= Uk×100/0.636.5×100/0.63=10.317三 三相對稱短路等值電流(一)等值電路 (二) 500 kV母線短路X=0.0044695/(0.0124846+0.0145) /(0.0115956+0.0145)=0.0033432Id0.11/ X=0.11/0.003343232.9kAIch1.52 Id =1.52×32.9

7、50.01kAich2.55 Id =2.55×32.983.9kA(三) I母線短路電流(1) 220 kVI母線短路X=0.0124846/(0.0115956+0.0145)/0.0044695+0.0145=0.0074241Id0.251/ X=0.251/0.007424133.81kAIch1.52 Id =1.52×33.8151.39kA ich2.55 Id =2.55×38.1886.21kA (2) 35 kVI母線短路X=0.0124846/(0.0115956+0.0145)/0.0044695+0.0145+0.0405 =0.047

8、9241Id1.56/ X=1.56/0.047924132.55kAIch1.52 Id =1.52×32.5549.48kA ich2.55 Id =2.55×32.5583.01 kA (3) 380VI母線短路X=0.0124846/(0.0115956+0.0145)/0.0044695+0.0145+0.0405+10.317=10.365Id144.34/ X=144.34/10.36513.93kAIch1.52 Id =1.52×13.9321.17kA ich2.55 Id =2.55×13.9335.51 kA(四) II母線短路電

9、流 (1) 220 kVII母線短路X=0.0115956/(0.0124846+0.0145)/0.0044695+0.0145=0.0071032Id0.251/ X=0.251/0.007103235.34kAIch1.52 Id =1.52×35.3453.71kA ich2.55 Id =2.55×35.3490.11kA (2) 35 kVII母線短路X=0.0115956/(0.0124846+0.0145)/0.0044695+0.0145+0.0405 =0.0476032Id1.56/ X=1.56/0.047603232.77kAIch1.52 Id

10、=1.52×32.7749.81kA ich2.55 Id =2.55×32.7783.57 kA (4) 380VII母線短路X=0.0115956/(0.0124846+0.0145)/0.0044695+0.0145+0.0405+10.317=10.365Id144.34/ X=144.34/10.36513.93kAIch1.52 Id =1.52×13.9321.17kA ich2.55 Id =2.55×13.9335.51 kA四. 單相接地短路電流(一) 等值電路見下圖(二)500kV母線單相短路電流X1=0.0033432X0=0.0

11、048689/(0.0145+0.0186741/0.0405)/(0.0145+0.0405/0.0174469) =0.0048689/0.0258006/0.0266939 =0.00355106Id0.11×3/(2×X1+ X0)=0.33/(2×0.0033432+0.00355106)32.23kA(三)220kVI母線單相短路電流X1=0.0074241X0=0.0186741/0.0145+0.0048689/(0.0145+0.0405/0.0174469) /0.0405 0.0075784Id0.251×3/(2×X1+

12、 X0)=0.753×(2×0.0074241+0.0075784)=33.58 kA(四)220kVII母線單相短路電流X1=0.0071032X0=0.0174469/0.0145+0.0048689/(0.0145+0.0405/0.0186741) /0.0405 0.007370252Id0.251×3/(2×X1+ X0)=0.753×(2×0.0071032+0.007370252)34.9 kA220kV分段運行, #1、#2主變接入I母，#3主變接入II母一系統(tǒng)參數(shù) 500kV Z1=0.0044695, Z0=0.

13、0048689 220kV I母：Z1=0.0124864, Z0=0.0186741 II母：Z1=0.0115956, Z0=0.0174469 SB=100MVA, VB=525/230 kV二 變壓器阻抗標(biāo)么值 X1=0.0145 X20 X30.0405站用變阻抗標(biāo)么值 Xk= 10.317三 三相對稱短路等值電流(一) 等值電路(二) 500 kV母線短路X=0.0044695/(0.0124846+0.0145/2) /(0.0115956+0.0145)=0.0031976Id0.11/ X=0.11/0.003197634.4kAIch1.52 Id =1.52×3

14、4.452.2kAich2.55 Id =2.55×34.487.72kA(三) I母線短路電流(1) 220 kVI母線短路X=0.0124846/(0.0115956+0.0145)/0.0044695+0.0145/2=0.0058663Id0.251/ X=0.251/0.005866342.79kAIch1.52 Id =1.52×42.7965.04kA ich2.55 Id =2.55×42.79109.11kA (2) 35 kVI母線短路X=0.0124846/(0.0115956+0.0145)/0.0044695+0.0145/2+0.040

15、5 =0.0463663Id1.56/ X=1.56/0.046366333.65kAIch1.52 Id =1.52×33.6551.14kA ich2.55 Id =2.55×33.6585.8kA (3) 380VI母線短路X=0.0124846/(0.0115956+0.0145)/0.0044695+0.0145/2+0.0405+10.317=10.365Id144.34/ X=144.34/10.36513.93kAIch1.52 Id =1.52×13.9321.17kA ich2.55 Id =2.55×13.9335.51 kA(四)

16、 II母線短路電流 (1) 220 kVII母線短路X=0.0115956/(0.0124846+0.0145/2)/0.0044695+0.0145=0.007074Id0.251/ X=0.251/0.00707435.48kAIch1.52 Id =1.52×35.4853.93kA ich2.55 Id =2.55×35.4890.47kA (2) 35 kVII母線短路X=0.0115956/(0.0124846+0.0145/2)/0.0044695+0.0145+0.0405 =0.047574Id1.56/ X=1.56/0.04757432.79kAIch

17、1.52 Id =1.52×32.7949.84kA ich2.55 Id =2.55×32.7983.62 kA (4) 380VII母線短路X=0.0115956/(0.0124846+0.0145/2)/0.0044695+0.0145+0.0405+10.317=10.365Id144.34/ X=144.34/10.36513.93kAIch1.52 Id =1.52×13.9321.17kA ich2.55 Id =2.55×13.9335.51 kA 四. 單相接地短路電流(一) 等值電路見下圖(二)500kV母線單相短路電流X1=0.00

18、31977X0=0.0048689/(0.0186741/0.0405+0.0145/2)/(0.0174469/0.0405+0.0145) 0.00341564Id0.11×3/(2×X1+ X0)=0.33/(2×0.0031977+0.00341564)33.64kA(三)220kVI母線單相短路電流X1=0.0058663X0=0.0186741/0.0145/2+0.0048689/(0.0145+0.0405/0.0174469) /0.0405 0.0060165Id0.251×3/(2×X1+ X0)=0.753/(2×0.0058663+0.0060165)=42.42 kA(四)220kVII母線單相短路電流X1=0.007074X0=0.0174469/0.0145+0.0048689/(0.0145/2+0.0186741/0.0405) /0.0405 0.0073364Id0.251×

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