Transmission Lines Para Metres

Transmission Lines Inductance a  2 1 0 Ia

La  D  D

X



D

Y



D

2 X

 D

D

X 1

 D

D

Y 1

 D

7

ln

D H / m per phase r '

2 Y

 ...  D

X 2

n  ...  D

Y 2

Xn

Yn

n

r '= 0 . 7 7 8 r D is the geometrical distance between lines, and r' is the inner radius.

Capacitance 2   D  ln    r    8 .8 5  1 0 C=

1 2

Series and shunt impedances Series impedance The impedance caused by lineresistance and lineinductance in series. R

d c ,T



Tl  A

Shunt impdance The impedance caused by capacitance between transmission line.