Figure 1.9 shows the single-line diagram of a balanced three-phase power system, in which a synchronous generator

Question:

Figure 1.9 shows the single-line diagram of a balanced three-phase power system, in which a synchronous generator has been connected to a no-load transmission line through a transformer.

Calculate the Thevenin reactance seen from the end of the transmission line. In this problem, the rated quantities of the generator are considered as the base values:

\[
\begin{gathered}
\mathrm{G}: 20 \mathrm{kV}, 300 \mathrm{MVA}, X_{G}=20 \% \\
\mathrm{~T}_{1}: 20 / 230 \mathrm{kV}, 150 M V A, X_{T}=0.1 \mathrm{p} \cdot \mathrm{u} . \\
\text { Line }: 176.33 \mathrm{~km}, X_{\text {Line }}=1 \Omega / \mathrm{km}
\end{gathered}
\]

1) 0.9 p.u.

2) 1.2 p.u.

3) 1.3 p.u.

4) 1.4 p.u.

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