4. (30 points) The figure below shows the one-line diagram of a generator, a step-up transformer bank, a transmission line, a step-down transformer bank and a wye-connected three-phase impedance load. Zonet

1 Zone 2 Generator Vgen=24kV Zgen-j0.10pu Sgen=80MVA Transformer 1 24kV :220kV ZT1=j0.1pu ST1=60MVA YY Transmission Line Length-100 miles Zline (0.5+j2)/mile Zone] Transformer 2 220kV: 11kV ZT2=j0.1pu ST2=40MVA Load Vload=10.45kV Zload (2+j1) Sload=30MVA a. (20 points) Sbase34 =100MVA and Vbase1=22kV. Determine Vbase2, Vbase3, Vgenpu, Zgpu_new, ZT1pu_new, ZT2pu_new, Zlinepu, and Zloadpu. b. (10 points) Assuming ABC phase sequence, draw the per unit equivalent circuit including the transformer phase shift using the American standard.