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​​​​For a two-phase network, the phase voltages $V_{p}$ and $V_{q}$ are to be expressed in terms of sequence voltages $V_{\alpha}$ and $V_{\beta}$ as $\left[\begin{array}{l}V_{p} \\ V_{q}\end{array}\right]=\mathbf{S}\left[\begin{array}{l}V_{\alpha} \\ V_{\beta}\end{array}\right]$. The possible option(s) for matrix $\mathbf{S}$ is/are

  1. $\left[\begin{array}{cc}1 & 1 \\ 1 & -1\end{array}\right]$
  2. $\left[\begin{array}{ll}1 & 1 \\ 1 & 1\end{array}\right]$
  3. $\left[\begin{array}{ll}1 & 1 \\ 1 & 0\end{array}\right]$
  4. $\left[\begin{array}{cc}-1 & 1 \\ 1 & 1\end{array}\right]$

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