Expert Answers

 1. In the per-phase equivalent circuit of the Figure 9.10b below assume Rs =0 and Xs =1.2pu. the terminal voltage Va = 1< 0 pu and /a =<-π/pu Calculate Eaf and draw a phasor diagram similar 9.10a.

2. In problem #5 above with Eaf kept constant at the magnitude calculate and Vn =1 pu, calculate the maximum power in per unit that this machine can supply.

3. In the per-phase equivalent circuit of Figure 9.17b blow assume Rs =OXs = 1.2 pu Xs =0.33 pu and Xs =0.23pu. the terminal voltage Va = 1< 0 pu and the current Ia =1< - π/6pu Draw the phasor diagram similar to the figure 9.17a for the steady state, transient and the subtransient operation