Answer Happy

1)For the system shown below, where all quantities are in p.u.,
find δ2, δ3, and |V2|, and QG3, using the power flow equations.
[12.5 marks] 1 V   1.0 0 3 3 V   1.0  3 0 PG  1.0 0.5 pu Load
S j   0.1 pu Z j L  0.1 pu Z j L  V222  V  QG
2) 2. The system shown below has two identical generators,
both grounded through Xg. All parameters are given in per unit.
[12.5 marks] Bus 1 Bus 2 Bus 3 Bus 4 0.1 pu X j tr  0 '' 0.1 pu
0.02 pu 0.1 pu g X j X j X j    1 2 0 0.1 pu 0.3 pu XX j X j  
 2 S j  0.5 0.1 pu  4 S j  0.5 0.1 pu  Determine the fault
currents for a solid double-line-to-ground fault at Bus 3, ignoring
the loads and assuming a flat voltage profile.
1. For the system shown below, where all quantities are in p.u., find 82, 83, and |V2], and Qg3, using the power flow equations. [12.5 marks) Z = j0.1 pu Z = j0.1 pu V2 =|vz|282 V, = 1.028 V = 1.020 Pa3 = 0 Soad = 1.0+ 0.5 pu QG3 2. The system shown below has two identical generators, both grounded through Xg. All parameters are given in per unit. [12.5 marks] Bus 1 S, = 0.5+ 0.1 pu Krom X" = j0.1 pu X, = j0.02 pu X = j0.1 pu X = X2 = j0.1 pu X, = j0.3 pu Bus 2 Bus 3 Y A x = j0.1 pu T Bus 4 Se = 0.5+ j0.1 pu Determine the fault currents for a solid double-line-to-ground fault at Bus 3, ignoring the loads and assuming a flat voltage profile.