Question

A transposed overhead transmission line has following parameters:
Self reactance, $X_s=0.5\Omega /km;$

Mutual reactance, $X_m=0.2\Omega /km$
The value of positive sequence reactance $x_1$ and zero sequence reactance $x_0$ respectively for above mentioned line in $\Omega$/km will be

• A. 0.3, 0.9
• B. 0.8, 0.2
• C. 0.5, 0.4
• D. 0.6, 0.5

Answer 1

The correct option is A 0.3, 0.9

For given transmission line,
Positive sequence reactance, $x_1=X_s-X_m$

$=0.5-0.2$

$=0.3\Omega /km$
Zero sequence reactance, $x_0=X_s+2X_m$

$=0.5+0.2\times 2$

$=0.9\Omega /km$