(Question 1): For the power system shown in figure 1. Generator/Transmission line/step-down transformer feeds a 100 MW/25 Mvar load. Parameters of Transformer: 100 MW o Mar C Transformer Control Automatic Control Type AVR Automatic Min Tap Ratio 0.900000 Control Max Tap Ratio 1.100000 Options Regulation Min. Voltage 0.995000 Regulation Max. Voltage 1.000000 Bus 1 66.00 kV Bus 2 Bus 3 66.00 kv X=0.05 MVA Limit=200 11.00 kv 0% 0% 100 MW 1.00000 tap 25 Mar X=0.06 LTC Control Status: NO MVA Limt=200 Part 1: Off load Tap Changer Transformer: 1. Build the power system shown in figure 1 using PowerWorld Simulator. 2. Set the transformer as an off-load tap changer transformer. 3. Record the Load bus voltage as the off nominal tap ratio changes. 4. Tabulate your results in the following table. 5. Explain the changes happen on the voltage of the load bus with changing the tap ratio. (Use your Own words) Off Nominal Tap Ratio Load Bus Voltage 0.99750 0.99850 0.99950 1.00000 1.00312 1.01248 1.02496 1.03750