A Single Area consists of 3 generating units (G1/G2/G3) with the following characteristics: G1: 425 MVA rating, R1 = 0.015 pu (on the 425 MVA base), initial output P1 = 300 MW. G2: 300 MVA rating, R2 = 0.02 pu (on the 300 MVA base), initial output P2 = 200 MW. G3: 300 MVA rating, R3 = 0.03 pu (on the 300 MVA base), initial output P3 = 200 MW. The frequency of the system is 60 Hz. Assuming D = 0 pu and using a common base of 1000 MVA, what is the new steady-state frequency for a load increase of 100 MW? Select one: O a. None of these O b. 59.96 Hz O c. 58.75 Hz O d. 59.88 Hz

If the load draws a current of 2727 A, in phase, from a generator, which of the following statement is true? O A. The reactive power is flowing from generator to the load and the real power is flowing from the load to the generator. O B. Since the current is in phase with the generator voltage, both the real and reactive power is flowing from the generator to the load. O .Since the current is leading the generator, both the real and reactive power is flowing from the load to the generator. O D. The real power is flowing from generator to the load and the reactive power is flowing from the load to the generator. O E. None of the other choices are correct

In the system shown in Figure 1, the transformers are connected star-star with both star points grounded and the generator is connected in star with its star points grounded. The per unit impedances of each element on a 40 MVA base are given in Table 1 and the voltage levels are given in Table 2. Z [p.u.] 0 2 tööt Generator 0.01 +j0.08 p.u. L Figure 1: A section of the distribution system Transformer T1 Line V BASE [KV] 0.04 + j 0.03 + j 0.15000000000000002 0.06000000000000000 Generator Table 1: Sequence impedances (p.u. on 40 MVA base) 3 T2 181. Line 3 10 Table 2: Voltage bases (kV) Load 1 Transformer T2 Load Current A load current of 11.316 kA is flowing with a lagging power factor of 90 %. Convert this to a current vector in per-unit. IL = 0.04 + j 0.06000000000000000