电缆允许短路电流和电缆金属屏蔽短路电流计算

s

s

s D R I W π2=

ηρs s A R 20

=

s

c

s s D k A K π=

s

s

T

s T

s

K W K k k

K R αρρ+

+

=

2

1421s

s

T

s T

s

K W K k k

K R αρρ+

-=

2

2421

()()()()[]()()[]

?

?????----=

1exp 11exp 1,022

22121121t R erfc t R R t R erfc t R R K R R W t s

s

θs

s K W

(

)]

?

?

?-12

t R fc