Given the electrical system below and the pertinent information for each element of the system, answer the items considering Sb=100MVA and Vb=138kV on the B01 bus and phase sequence direct:

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1) Obtain the equivalent single-phase circuits of positive, negative and zero sequence in PU; (20 points)

2) Obtain the Vab voltage phasors (in volts) for each bus in the informed operational condition; (10 points)

3) Obtain Zbus through the direct method and positive sequence Ybus of the analyzed system; (20 points)

4) List the positive-sequence Th¥nin equivalents of each bar; (10 points)

5) Obtain the frank three-phase short-circuit currents of buses B04 and B05; (10 points)

6) Inform the current phasors (in Ampere) of phases A, B and C that flow from B01 to the power bank transformers, during a frank FT fault on phase A of bus B03; (15 points)

7) Inform the voltage phasors of phases A, B and C (in volts) of the B04 bus, during a frank FT fault on the phase A of bus B01; (15 points)