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# 趋肤效应 - PowerPoint PPT Presentation

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### 趋肤效应

γ=1/ρ-材料的电导率；

Κ-材料电导率（或电阻率）温度系数；对于铜μ=

μ0=4π×10-7H/m; 20℃时ρ=0.01724×10-6 Ω/m，电阻率温度系数为1/234.5（1/℃），Κ=（1+（T-20）/234.5）。

T-导线温度（℃）。铜导线温度20℃、不同频率下的穿透深度：

Sf =S Rac =Rdc

S -- 导线截面面积

Rdc -- 导线的直流电阻

Rac -- 导线的交流电阻

(* 在计算圆导线和扁导线的交流趋肤效应电阻时，设定趋肤深度条件为小于圆线半径或扁线窄边高度的1/2，在趋肤深度大于这个设定时，计算趋肤效应电阻是无意义的)

1、用多股细线并联代替单根导线来减低趋肤效应的影 响：

D =2 x =1.50mm

Sfn =πx df 2 / 4 =0.13726 mm2

Jn =In/Sfn=5.66 A/mm2

2、用带状导线来减低趋肤效应的影响：

a =2 x mm

W = mm

S =I/J=100/5=20.0 mm2

Sf =2 x d x ( b + a - 2 x d )=4.842mm2

3、利用管和泊减低趋肤效应的影响：