Load 어 G Load Figure 1. One line diagram of a three bus power transmission system. In Figure 1, the power flows in the transmission lines are to be found. In this system, 100 MVA and 154 kV are the base values. The generator bus, which is shown as Bus 1, is considered to be an infinite bus and the voltage magnitude and the angle are 1 and 0°, respectively. The voltages of Bus 2 and Bus 3 are not known, but they will be determined after the load flow. The per unit values of transmission lines are given in Table 1. Table 1. Nominal 7 equivalent circuit parameters of transmission lines. Transmission Line Between bus 1 and 2 Z 0.04+j 0.14 Y j 0.002 Between bus 1 and 3 0.02+j 0.1 j 0.001 Between bus 2 and 3 0.01+j 0.25 j 0.003 The loads on Bus 2 and Bus 3 can be modelled according to the load type: Constant impedance, constant current, or constant power. The power flows of the transmission lines can be determined based on the model used. The model often used in power systems is the constant power representation of the load. To see the effect of these load models, the following questions have been prepared. Please, use the Nominal- 7 equivalent circuit model of the transmission lines when you are answering the questions. Questions 1. If the load impedance of Bus 2 is 0.9+j 0.3 pu and the load impedance of Bus 3 is 0.6+j 0.4 pu, find the power flow of transmission lines and the voltages of busses in MVA and kV, respectively. Check if the generator power is equal to total of load powers. 2. If the load current of Bus 2 is 1-j 0.3 pu and the load current of Bus 3 is 1.2-j 0.8 pu, find the power flow of transmission lines and the voltages of busses in MVA and kV, respectively. Check if the generator power is equal to total of load powers. 3. If the power of the load in Bus 2 is 1+j 0.3 pu and the power of the load in Bus 3 is 1.2+j 0.8 pu, find the power flow of transmission lines and the voltages of busses in MVA and kV, respectively. Check if the generator power is equal to total of load powers.