电缆线的电压损耗如何计算 电缆电压压降如何计算？
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1、X平方米铜线载流为I，20℃，铜电阻率：0.0175Ω·mm2/m。
2、用于单相220V电路，电压降U=I*R=I*0.0175*Y*2/X，损耗功率P=U*I。
3、用于三相380V电路，电压降U=I*R=I*0.0175*Y*1.732/X，损耗功率P=U*I*1.732。
导线材料、截面S、长度L、负电流I为基数，计算单根导线电阻：R=电阻率*L/S，铜线电阻率为0.0172，铝线为0.0283，计算单根导线电压降：U=RI
电压损耗=功率损耗/电流
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