短路电流计算及电缆校核公式

一、 X0= 0.400 X0= 0.400 L = 0.00 L = 0.00 XL= 0.000XL= 0.000 Sb= 0.00 Sb= 12.500 Sb= 0.000 X0= Ud= 7.000 Ud= 8.000 Ud= 7.500 L = Xb= - Xb= 0.640 Xb= - XL= Sf= 0.00 Sf= 10.000 Sf= 0.000 X“d= 0.200 X“d= 0.183 X“d= 0.183 Xf= - Xf= 1.464 Xf= - 0.0000.000 -0.640- -1.464- -S1- 0.000 0.640 -1.464- -S1- 0.640 -1.464- 2、阻抗变换 xxxxxxx电站短路电流计算110kV上网方案 (Sj=100 MVA，Uj=Up kV；单位MW、MVA、km) 1、基本参数 6.3kV G3 G1 6.3kV 115kV T1 T3 G2 37kV T2 6.3kV 115kV d-2 d-1 d-1 37kV 6.3kV d-2 d-1 37kV 6.3kV d-2 d-1 115kV 6.3kV d-2 -S1- 0.640 -1.464 -S1 0.640 1.464 S1 1.464 10000000000.000 0.744 S1S4Sx 有名值 I“ 短路容 量S“ 有名值 I0.2 kVMWKAKAMVAKA 110kV系统Sx0.7449.1641.34312.310134.312.310 发电机F110.001.4640.1831.1466.1277.01976.64.1004.697 发电机F23450.00 10000000000.00 0.0000.0006.1270.0000.04.1000.000 19.329210.917.007 110kV系统Sx0.1040.5029.5754.807957.44.807 发电机F110.002.1040.2630.0634.2900.26953.63.2530.204 发电机F23450.00 10000000000.000 0.0000.0006.1270.0000.04.1000.000 5.0761011.15.011 标幺值 I*“ (查表) 标幺值 I*0.2 6.3 115 电源名称 额定容 量Se 直连电 抗 X 短路点 d-1 d-2 3、短路电流计算成果 短路电流计算成果表 电源计算数据短路电流计算数据 t=0st=0.2s平均 电 压 Up 计算电 抗 Xjs （查表） 电源额 定电流 Ie d1点短路时 37kV 6.3kV d-2 d-1 37kV 6.3kV d-2 d-1 d-1 I*0S= 6.127 I*0.2S= 4.1 I*4S= 3.081 I*t=0s6.127 I*t=0.2s 4.1 I*t=4s3.081 Xjs0.180.200.220.240.260.280.300.320.340.360.38 t=06.1275.5265.0554.6474.2903.9933.7273.4943.2853.0952.922 t=0.24.1003.8563.6333.4333.2533.0962.9502.8172.6922.5742.464 t=43.0813.2343.1913.1513.0983.0432.9932.9432.8912.8372.782 I*0S= 6.127 I*0.2S= 4.1 I*4S= 3.081 I*t=0s6.127 I*t=0.2s 4.1 I*t=4s3.081 Xjs0.180.200.220.240.260.280.300.320.340.360.38 t=06.1275.5265.0554.6474.2903.9933.7273.4943.2853.0952.922 t=0.24.1003.8563.6333.4333.2533.0962.9502.8172.6922.5742.464 t=43.0813.2343.1913.1513.0983.0432.9932.9432.8912.8372.782 I*0S= 4.29 I*0.2S= 3.253 I*4S= 3.098 I*t=0s4.29 I*t=0.2s 3.253 I*t=4s3.098 Xjs0.180.200.220.240.260.280.300.320.340.360.38 t=06.1275.5265.0554.6474.2903.9933.7273.4943.2853.0952.922 t=0.24.1003.8563.6333.4333.2533.0962.9502.8172.6922.5742.464 xjsIch；额定开断电流I“；允热稳定电流2 允许通过时间tI“20.2 0.2 ； 额定关合电流ich 以下是查算发电机短路电流曲线表的中间过程可不必查看！ 0.000 0.263 d-1短路时F234回路I*t计算 注释 发电机电抗标么值：Xf=X“d%/100*Sj/Sf有名值计算：I“=Ie*I“* 变压器电抗标么值：Xb=Ud%/100*Sj/Sb短路容量：S“=1.732*Up*I“ t=43.0813.2343.1913.1513.0983.0432.9932.9432.8912.8372.782 I*0S= 6.127 I*0.2S= 4.1 I*4S= 3.081 I*t=0s6.127 I*t=0.2s 4.1 I*t=4s3.081 Xjs0.180.200.220.240.260.280.300.320.340.360.38 t=06.1275.5265.0554.6474.2903.9933.7273.4943.2853.0952.922 t=0.24.1003.8563.6333.4333.2533.0962.9502.8172.6922.5742.464 t=43.0813.2343.1913.1513.0983.0432.9932.9432.8912.8372.782 Xjs0.180.200.220.240.260.280.300.320.340.360.38 t=06.1275.5265.0554.6474.2903.9933.7273.4943.2853.0952.922 t=0.24.1003.8563.6333.4333.2533.0962.9502.8172.6922.5742.464 t=43.0813.2343.1913.1513.0983.0432.9932.9432.8912.8372.782 Xjs0.540.560.600.650.700.750.800.850.900.951.00 t=02.0131.9381.8021.6581.5341.4281.3361.2541.1821.1181.061 t=0.21.8261.7961.6651.5501.4511.3631.2861.2171.1551.0991.048 t=42.3962.3552.2632.1371.9641.7941.6421.5311.4031.3081.225 Xjs1.401.451.501.551.601.651.701.751.801.851.90 t=00.7510.7250.7000.6770.6550.6350.6160.5980.5810.5650.550 t=0.20.7660.7400.7170.6940.6730.6530.6340.6160.5990.5820.566 t=40.8130.7800.7500.7220.6960.6720.6490.6280.6090.5900.572 Xjs2.302.352.402.452.502.552.602.652.702.752.80 t=00.4530.4430.4340.4250.4160.4080.4000.3920.3850.3780.371 t=0.20.4620.4520.4410.4310.4220.4130.4040.3960.3880.3800.373 t=40.4620.4520.4410.4310.4220.4130.4040.3960.3880.3800.373 d-2短路时F234回路I*t计算 xjsIch；额定开断电流I“；允热稳定电流2 允许通过时间tI“20.2 0.2 ； 额定关合电流ich 以下是查算发电机短路电流曲线表的中间过程可不必查看！ 有名值计算：I“=Ie*I“*小插件 Y-变换计算 短路容量：S“=1.732*Up*I“1 3 2 3 2 X1 X3 XX31 X21 1 X32 X1 2.7282.6752.6242.5752.5272.4822.438 2.3962.3552.2632.1371.9641.794 I*t=0s3.095 I*t=0.2s2.574 I*t=4s2.837 0.400.420.440.460.480.500.520.540.560.600.650.700.75 2.7672.6272.5002.3852.2802.1832.095 2.0131.9381.8021.6581.5341.428 2.3612.2672.1792.0982.0231.9531.887 1.8261.7961.6651.5501.4511.363 2.7282.6752.6242.5752.5272.4822.438 2.3962.3552.2632.1371.9641.794 0.400.420.440.460.480.500.52 2.7672.6272.5002.3852.2802.1832.095 2.3612.2672.1792.0982.0231.9531.887 2.7282.6752.6242.5752.5272.4822.438 1.051.101.151.201.251.301.35 1.0090.9620.9190.8800.8430.8100.780 1.0020.9590.9200.8850.8520.8210.792 1.1521.0871.0290.9770.9300.8880.849 1.952.002.052.102.152.202.25 0.5360.5220.5090.4970.4850.4740.463 0.5510.5370.5230.5100.4970.4850.473 0.5560.5400.5250.5120.4980.4860.474 2.852.902.953.003.053.103.15 0.3640.3580.3510.3450.3390.3340.328 0.3660.3590.3530.3460.3400.3340.329 0.3660.3590.3530.3460.3400.3340.329 0.5320m时，则按经济电流密度选择 空气中多根并行敷设时 在空气中或穿管敷设时 Khj*K1*K2*Ixu不合要求空气中 聚氯乙希护套电缆 允许载流量表中系铝芯电缆数值，铜芯电缆可乘以1.29系数 不同环境温度时校正系数参见电力工程电缆设计规范GB50217-94；水-机电-手册电一P318 70mm2 回路持续工作电流 选用交联聚乙希绝缘 回路额定功率 回路额定工作电压 满足要求 回路最高工作电压 电力电缆额定电压 缆芯截 面mm2 空气中敷设（环境温度40度） 6kV10kV 20 1.840*10-6 d 200度 0 40度 c 90度 芯线在额定时的最高允许温度（交联聚乙希绝缘取90度；聚氯乙希绝缘取65度） 芯线在20度时的电阻率 （铝芯取3.1*10-6欧*cm；铜芯取1.84*10-6欧*cm） 芯线在短路时的最高允许温度（交联聚乙希绝缘取200度；聚氯乙希绝缘取130度） 电缆敷设地点的环境温度 无钢铠 有钢铠 无钢铠 有钢铠 9187879090 113105102110105 134123118125120 165148148152152 195178178182182 221200200205205 247232222223219 278262252252247 321300295292292 365343333332328 *380370378374 *432422428424 123 20253035*0.900.85 1.071.000.930.851.001.000.98 1.061.000.940.87 1.051.000.940.88 1.041.000.950.9095 120-185 1.041.000.960.920.900.85 3*253*353*503*703*953*120 3*150 3*185 3*240 0.3110.2220.1560.1110.1010.0830.0720.0620.053 0.0230.0170.0120.0090.0070.0060.0050.0040.004 0.0140.0100.0070.0060.0040.0040.0030.0030.002 （1/ ）*JQ/（kj* 20* ）ln(1+ （ d-20）)/(1+ （ g-20）) 0.5*10-2 为了保证电缆末端发生短路时，电缆芯线温度不超过允许值，电缆允许热效应 t应不小于线路计算的短路电流热效应 d