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380V25千瓦多大电缆

更新时间: 2021-04-05 08:49:14     

1、首先要计算25KW负荷的线电流。如果是25千瓦的对称三相,电流是44.74A,查表需要10平方铜芯线,它的截流量是59A。

2、三相电路功率的计算公式是:P=1.732IUcosφ。由三相电路功率公式可推出线电流公式:I=P/1.732Ucosφ;

式中:P为电路功率,U为线电压,三相是380V,cosφ是感性负载功率因素,一般综合取0.8,25KW负载的线电流:I=P/1.732Ucosφ=25000/1.732*380*0.8=25000/526.53=47.5A。

关键词: 380v25 千瓦 电缆

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