Question

The parameters of transposed overhead transmission line are, $X_s=0.8\Omega /km$ and$X_m=0.2\Omega /km$. The value of negative sequence reactance $X_2$ and zero sequence reactance $X_0$ respectively will be $\left(in\Omega /km\right)$

• A. 0.3, 0.6
• B. 0.6, 1.2
• C. 0.6, 0.9
• D. 0.3, 1.2

Answer 1

The correct option is D 0.3, 1.2

We know for transposed transmission line,

$X_2=X_s-X_m=X_1$

$X_0=X_s+2X_m$

Given, $X_s=0.8\Omega /kmand{X}_m=0.2\Omega /km$

where,

$X_1=+$ve sequence reactance

$X_2=-$ve sequence reactance

$X_0=$ zero sequence reactance

$\therefore$ Negative sequence reactance

$X_2=0.8-0.2=0.6\Omega /km$

Zero sequence reactance,

$X_0=0.8+2\left(0.2\right)=1.2\Omega /km$