A $220km,230KV,3-$phase line, $z=0\mathrm{.}09+j0\mathrm{.}44\frac{}{k}m,y=j{2\mathrm{.}3}^{**}{10}^6\frac{S}{k}m$

At full load the line delivers $270$ MW at $0\mathrm{.}95$ pf lagging and at $220$ KV $.$ Using $$

Circuit, calculate

ABCD parameters

Sending end voltage and current

Voltage regulation percentage

$\left[\begin{array}{c}{V}_S\\ I_S\end{array}\right]=\left[\begin{array}{cc}(1+\frac{YZ}{2}{)}_A& B^Z\\ Y(1+\frac{YZ}{4}{)}^C& 1+\frac{P}{2}\end{array}\right]\left[\begin{array}{c}{V}_R\\ I_R\end{array}\right]$

$A=D=1+\frac{YZ}{2}$

$B=Z,$

$C=Y(1+\frac{YZ}{4})$