230问答网 > 三相电35平方铝线，距离5百米，电机总功率9千瓦可以安全使用吗？线损

三相电35平方铝线，距离5百米，电机总功率9千瓦可以安全使用吗？线损

2025-03-26 22:08:02
推荐回答（1个）
回答1：

　　U=380v S=35mm2（铝） L=500m P=9kw COS=0.8
R=0.0315*500/35=0.45欧 I=9000/1.732*380*0.8=9000/526.528=17.1A
U=IR=17.1*0.45=7.69v P=3I2R=3*17.1*17.1*0.45=395w
如果满载时理论上；1.末端电压损失约7.7v 2.线损约0.4kw，根据计算是在允许范围内，所以可以安全使用的。

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