Question

Shunt reactive compensation improves transmission-line_________, series capacitive compensation increases transmission-line__________.

Short answer

The shunt reactive compensation increases the voltage regulation and series capacitive compensation increases the load ability of transmission line.

Step-by-step solution

Determine the formula to evaluate the effect of shunt reactive line and series capacitive compensation:

The equation to calculate the percentage regulation is given as follows.

$\mathit{V}\mathit{R}\mathbf{ }\mathbf{\%}\mathbf{ }\mathbf{=}\mathbf{ }\frac{\left|V_{RNL}\right|\mathbf{-}\left|V_{RFL}\right|}{\left|V_{RFL}\right|}$

Here, V_RFLis the voltage regulation at full load and V_RNLis the voltage at no load.

The equation to calculate the load ability in the transmission line is given as follows.

${\mathit{P}}_{\mathbf{R}\mathbf{.}\mathbf{m}\mathbf{a}\mathbf{x}}\mathbf{=}\frac{{\mathbf{V}}_{\mathbf{s}}{\mathbf{V}}_{\mathbf{R}}}{{\mathbf{Z}}^{\mathbf{*}}}\mathbf{-}\frac{\mathbf{A}{\mathbf{V}}_{\mathbf{R}}^{\mathbf{2}}}{{\mathbf{Z}}^{\mathbf{*}}}\mathit{c}\mathit{o}\mathit{s}\left({\theta }_Z-{\theta }_A\right)$

Here, V_Sis sending end voltage, V_Ris receiving end voltage, Zis transmission line impedance, Ais the transmission line parameter,${\mathit{\theta }}_{\mathbf{Z}}$angle of impedance and${\mathit{\theta }}_{\mathbf{A}}$is the angle of parameter A.

Determine the effect of shunt reactive and series capacitive compensative on transmission line.

In reactive shunt compensation, the voltage at no load decreases which improves the voltage regulation of the transmission line.

In the series, a compensation capacitor is added in the transmission line series, increasing the reactive power in the transmission line and decreasing the impedance, increasing the transmission line load ability.

Hence, the reactive shunt compensation increases the voltage regulation, and series capacitive compensation increases the load ability of the transmission line.