供电半径与电缆截面选择自动计算表格

供电半径与电缆截面选择,,,,,,,,

低压导线截面计算公式:S=PL/CΔU％,,,,,,,,

电压降(线路损耗衰减电压),,ΔU=U1－U2－(Δδ*U2),,46.60,,,,

电压衰减损耗率,,ΔU％=ΔU/U1×100,,11.65,,,,

,,Δδ=(U1－ΔU－U2)/U2,,-0.07,,,,

导线设计截面Smm²,导线计算截面Smm²,负荷有功功率Pkw,线路输送距离Lm,电压损失系数C,电压衰减损耗率ΔU％,电压偏差率Δδ,线路末端电压U2(V),线路前端电压U1(V)

120,104.2,51,1250,52.53,11.65,0.07,380,400

150,134.8,66,1250,52.53,11.65,0.07,380,400

,,,,,,,,,

"电压损失系数C:三相四线制供电且各相负荷均匀时，铜导线为85，铝合金为52.53,铝导线为50；",,,,,,,,

,单相220V供电时，铜导线为14，铝导线为8.4。,,,,,,,

供电半径计算公式,,L=2*C*S*ΔU％/P,,,,,,

"电压损失系数C:三相四线制供电且各相负荷均匀时，铜导线为75，铝合金为52.53,铝导线为50；",,,,,,,,

,单相220V供电时，铜导线为12.56，铝导线为8.4。,,,,,,,

电压损失ΔU％:按5～10%计。,,,,,,,,

,导线截面Smm²,负荷有功功率Pkw,电压损失ΔU％,电压损失系数C,最大合理供电半径m,,,

,120,51,5,52.53,1236,,,

,150,66,5,53.53,1217,,,

,,,,,,,,,

,,,,,,,,,

复核计算,,,,,,,,

方法一:,线路电压降计算公式为△U=（P*L）/(A*S),,,,,,,

电压损失ΔU％,电压降△U(V),负荷功率P(KW),线路长度L(m),材质系数A,导线截面S(mm²),电压等级(V),,

2.9,11.2,51,1250,47.6,120,380,,

3.0,11.6,66,1250,47.6,150,380,,

"A为导体材质系数（铜大概为77，铝合金大概为47.6,铝大概为46）",,,,,,,,

方法二:,"线路电压降计算公式为：△U=(P/(1.732*U))*(电阻率ρ*电缆长度L/电缆截面),计算值≦19V为合格",,,,,,,

电压损失ΔU％,电压降△U(V),负荷功率P(KW),"线路长度

L(m)",电阻率ρ,"导线截面

S(mm²)",电压等级(V),,

4.7,18.02,51,1250,0.0279,150,380,,

5.0,18.90,66,1250,0.0279,185,380,,

电阻R=ρ*L/s(电缆截面mm2),,,,,,,,

"电阻率ρ铜为0.0172欧*㎜2/米,铝合金为0.0279欧*㎜2/米,铝为0.028欧*㎜2/米",,,,,,,,

,,,,,,,,,

方法三:,线路电压降计算公式为：△U=I*R,,,,,,,

电压损失ΔU％,电压降△U(V),线路电流I(A),线路电阻R(Ω),负荷功率P(KW),"线路长度

L(m)",电阻率ρ,"导线截面

S(mm²)",电压等级(V)

5.6,21.2,91.16,0.233,51,1250,0.0279,150,380

5.9,22.2,117.98,0.189,66,1250,0.0279,185,380

"I=P/1.732*U*COSØ,其中:COSØ按0.85计",,