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Consider a HVDC link which uses thyristor based line-commutated converters as shown in the figure. For a power flow of $750$ MW from System $1$ to System $2$, the voltages at the two ends, and the current, are given by: $V_{1} = 500 kV, V_{2} = 485 kV$ and $I = 1.5 kA$. If the direction of power flow is to be reversed (that is, from System $2$ to System $1$) without changing the electrical connections, then which one of the following combinations is feasible?

  1. $V_{1} = −500 kV, V_{2} = −485 kV$ and $I = 1.5 kA$
  2. $V_{1} = −485 kV, V_{2} = −500 kV$ and $I = 1.5 kA$
  3. $V_{1} = 500 kV, V_{2} = 485 kV$ and $I= −1.5 kA$ 
  4. $V_{1} = −500 kV, V_{2} = −485 kV$ and $I = −1.5 kA$
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