远距离电缆截面对电压损耗的影响.doc

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1、1KV交联聚乙烯绝缘电力电缆用于三相380V系统的电压损失截面mm2　电阻θ=80℃Ω/km感抗　Ω/km电压损失[%（A.km）]cosΨ0.50.60.70.80.91铜45.3320.0971.2531.4941.7331.9712.2072.4363.5540.0920.8461.0061.1641.3211.4761.62102.1750.0850.5290.6260.7220.8160.9090.991161.3590.0820.3420.4020.460.5180.5740.619250.870.0820.2310.2680.3040.340.3730.397350.622

2、0.080.1730.1990.2240.2490.2710.284500.4350.0790.130.1480.1650.180.1940.198700.310.0780.1010.1130.1240.1340.1430.141950.2290.0770.0830.0910.0980.1050.1090.1041200.1810.0770.0720.0780.0830.0870.090.0831500.1450.0770.0630.0680.0710.0740.0750.061850.1180.0780.0580.0610.0630.0650.0640.0542400.0910.077

3、0.0510.0530.0540.0540.0530.041ïïþïïýü按照铜芯240平方毫米、300A、cosΨ0.8时Δua=0.054计算线路电压损失D=¢+¢=DD=¢+¢=Δu=ILΔua=300A*0.4km*0.054=6.48V/2根=3.24V