(Solved): show steps For the single line diagram in the figure, assume that a double line-to-ground fault has ...

For the single line diagram in the figure, assume that a double line-to-ground fault has happened in Bus 1, phases $$B$$ and $$C$$ to ground. Positive, negative and zero sequence impedances are given as follows: Zth $${}^{+}={\mathbf{Zth}}^{?}=j0.3$$ p.u. and Zth $${}^0=00.1$$ p.u. Calculate zero sequence current la0 in pu, and choose one of the following options $$10<90^{?}\mathrm{pu}$$ $$2<90^{?}\mathrm{pu}$$ $$10<?90^{?}\mathrm{pu}$$ $$2.67<?90^{?}\mathrm{pu}$$