Defined in File BranchData.hpp
Buses for a branch.
Values:
\(V_{\mathrm{r}1},V_{\mathrm{i}1}\) Required Known bus-1 terminal voltage, the tapped side [p.u.]
\(V_{\mathrm{r}2},V_{\mathrm{i}2}\) Required Known bus-2 terminal voltage [p.u.]