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电力工程短路电流计算

2021-08-27 来源:年旅网
低压三相和单相接地故障电流计算表序号电路元件短路点元件阻抗(兆欧)短路点阻抗(兆欧)三相短路电流单相接地故(kA)障电流(Ka)短路电流短路冲击电流冲击系数(Ka)短路冲击电流最大有效值(Ka)R系统S(按∞考虑)(查表)变压器,D,yn11(查表)L1母线段(TMY3(2(100X8)+100 X10,18M1+2+3XRphpXphpZK=√Zphp=√Rk2+Xk2Rphp2+Xphp2I''=1.05Un√3/ZkId=Un/√3/ZphpXk/RkKp查图ip=√2KpI''Ip=I''√1+2(Kp-1)2120.000.690.005.960.000.690.005.9630.293.260.866.59A长度L1Rm'A0.989.221.5512.559.27 12.6424.8517.359.431.7360.7935.72180.016 Xm'0.181R'phpX'php.m4B0.0480.366L2电缆段(3X(ZR-BVV22-3X240+2X120)A+42.183.151.7510.979.5211.074.0816.6311.4119.9820.1910.983.481.4340.8223.63 第1页,共3页

低压三相和单相接地故障电流计算表序号电路元件短路点元件阻抗(兆欧)短路点阻抗(兆欧)三相短路电流单相接地故(kA)障电流(Ka)短路电流短路冲击电流冲击系数(Ka)短路冲击电流最大有效值(Ka)长度L2Rm'Xm'68 Z0.032 0.0257R'phpX'php.m5C长度L3Rm'0.140.06L3电缆段:ZR-VV-3X240+2X120B+5C 12.0015.159.6420.6052.5063.5722.5039.1325.5874.659.012.941.361.0813.769.06125 0.096 Xm'0.0771R'phpX'php.m60.420.18L4电缆段:VV-3X70+2X35D5.0211.921.563.56第2页,共3页

低压三相和单相接地故障电流计算表序号电路元件短路点元件阻抗(兆欧)短路点阻抗(兆欧)三相短路电流单相接地故(kA)障电流(Ka)短路电流短路冲击电流冲击系数(Ka)短路冲击电流最大有效值(Ka)D长度L3Rm'C+6 20.1732.5265.1342.6938.2777.886.022.821.611.129.536.1120 0.251Xm'R'phpX'php.m0.5960.0780.178第3页,共3页

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