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2×100+4×300MW发电厂电气部分初步设计（励磁系统）

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2025/12/2 20:21:02

图3-4 K3点短路等值电路图

X12?X3?X4?0.156?0.0875?0.2435

1X13?(X6?X7)//(X8?X9)//(X10?X11)//(X12?X13)??0.0397?0.0473??0.0224X?X140.033?0.44X16?X5?X14?5?0.033?0.44??1.14

X130.022X?X150.033?0.022X15?X5?X15?5?0.033?0.022??0.0567

X140.44111111X3??1(??)?1(??)?0.044

X12X16X150.24351.140.0567XX0.0440.044C1?3???0.181 C2?3???0.776

X120.2435X150.0567X0.044C3?3???0.0386

X161.14X??X3??X2?0.0386?0.0875?0.126

XX0.1260.126X1d????0.696 X2d????0.162

C10.181C20.776X0.126X3d????3.26

C30.0386发电机G1相对短路点的计算电抗为：

SN1100/0.85?0.156??0.184 SB100发电机G2相对短路点的计算电抗为：

S100/0.85Xjs2?X1d?N2?0.696??0.818

SB100发电机G3、G4 、G5、G6相对短路点的计算电抗为：

4?SN24?300/0.85Xjs3?X2d??0.162??2.287

SB10011??0.306 220KV系统相对短路点的计算电抗为：Xjss1?X3d3.26

（4）K4点短路即3#主变压器低压侧短路

Xjs1?X1?

图3-5 K4点短路等值电路图

X12?(X1?X2)//(X3?X4)?0.122

11X15??X8?X9?//?X10?X11?//?X12?X13???X8?X9???0.087?0.029

33X13?X5?X12?0.122?0.033?0.155 X14?0.44

111111X3??1(??)?1(??)?0.023X13X14X150.1550.440.029

C1?C3?X3?X13X3???X0.0230.023?0.148 C2?3???0.0523 0.155X140.440.023?0.793

X150.029X??X3??X6?0.023?0.0397?0.0627

XX0.06270.0627X1d????0.424 X2d????1.2 0C10.148C20.0523X0.0627X3d????0.079

C30.793发电机G1、G2相对短路点的计算电抗为：

2?SN12?100/0.85Xjs1?X1d??0.424??0.998

SB100发电机G3相对短路点的计算电抗为：

S300/0.85Xjs3?X7?N3?0.0473??0.167

SB100发电机G4、 G5 、G6相对短路点的计算电抗为：

3S3?300/0.85Xjs4?X3d?N?0.079??0.836

SB100220KV系统相对短路点的计算电抗为：

1Xjss1??0.833

X2d

（5）K5点短路即联络变压器低压侧短路

16151515图3-6 K5点短路等值电路图

X16?(X1?X2)//(X3?X4)?0.122 X18?X16?X5?0.122?0.026?0.148

星角变换：

X17??X6?X7??X8?X9??X10?X11??X12?X13??X14?0.44

1??0.087?4?0.022

X''5?X17?0.037 X14X''5?X14X'14?X''5?X14??0.595

X17111111X3??1(??)?1(??)?0.00.028X14X17X180.5950.0370.148XX0.0280.028C1?3???0.189 C2?3???0.047

X180.148X140.595X0.028C3?3???1.273

X170.022X??X3??X15?0.028?0.026?0.054

XX0.0540.054X1d????0.286 X2d????1.1 5C10.189C20.047X0.054X3d????0.042

C31.273发电机G1、G2相对短路点的计算电抗为：

2S2?100/0.85Xjs1?X2d?N1?0.286??0.673

SB100发电机G3、G4、 G5、G6相对短路点的计算电抗为：

4S4?300/0.85Xjs2?X4d?N2?0.042??0.593

SB100220KV系统相对短路点的计算电抗为：

11Xjs3???0.87

X2d1.15X'17?X''5?X17?（6）K6点短路即1#发电机高压厂用变压器低压侧短路

要计算K6点短路时各电源对短路点的计算电抗，先要计算K3点短路时各电源对短路点的转移电抗，由前面计算知：

X1?0.156，X1d?0.696，X2d?0.162，X3d?3.26，

K6点短路计算：

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18 图3-4 K3点短路等值电路图 X12?X3?X4?0.156?0.0875?0.2435 1X13?(X6?X7)//(X8?X9)//(X10?X11)//(X12?X13)??0.0397?0.0473??0.0224X?X140.033?0.44X16?X5?X14?5?0.033?0.44??1.14 X130.022X?X150.033?0.022X15?X5?X15?5?0.033?0.022??0.0567 X140.44111111X3??1(??)?1(??)?0.044 X12X16X150.24351.140.0567XX0.0440.044C1?3???0.181 C2?3???0.776

2×100+4×300MW发电厂电气部分初步设计（励磁系统）

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