(Solved): a) From the long-length transmission line model, given in the formula sheet, drive an equivalent ...

a) From the long-length transmission line model, given in the formula sheet, drive an equivalent $$?$$-model. [6 points] b) A three-phase, $$60?\mathrm{Hz}$$, completely transposed $$500?\mathrm{kV},250?\mathrm{km}$$ line has two $$795,000?\mathrm{c}u\dots$$ $$26/2$$ ACSR conductors per bundle and the following $$ABCD$$ parameters: $$\begin{array}{c}A=D=0.9313??0.209^{?}\\ B=97?872^{?}\\ C=1.37\times 10^{?}?90^{?}\end{array}$$ [ 14 points] The full load at the receiving end of the line is $$600\mathrm{MVA}$$ at $$0.9$$ p.f. lagging and at $$95\%$$ of rated voltage. Determine the following: 1) Sending-end voltage $$V_s$$. 2) Current $$I_s$$ and real power $$P_s$$. 3) Percent voltage regulation. $$?$$ 4) Transmission-line efficiency at full load. 5) Full-load line losses. 6) Theoretical maximum power transfer.