December 2012
Beginner
528 pages
17h 31m
English
Content preview from Introduction to Electrical Power and Power Electronics
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161Power Cable
Current density J
R
o
0
J = e
–1
= 0.368
J
o
= 1.0
(b) Equivalent area of uniform
current density (shaded area)
(a) Actual current density decaying
from outer surface
δ
δ
FIGURE 6.5 Skin effect and resulting nonuniform current distribution in round conductor.
+ I
– I
(a) Round conductors get current
concentration near facing area
+ I
– I
(b) Bus bars with facing flats get current
concentration near facing strips
FIGURE 6.6 Proximity effect in two adjacent current carrying conductors.
162 Introduction to Electrical Power and Power Electronics
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