Question

Q2. The one-line diagram of a simple power system is shown below. The transmission line impedance is shown on the one-line diagram. The generator, transformers and the loads are rated as follows: (CLO2) (9 marks * (1/3)). Generator (G) : 200 MVA, 18 kV, X = 0.1 pu Transformer 1 (T1) : 250 MVA, 20? / 200Y kV, X = 0.12 pu Transformer 2 (T2) : 120 MVA, 230Y / 23? kV, X = 0.07 pu Load1 : S1 = 120 MW + j90 MVar, at 18 kV Load2 : S2 = 40 MW + j30 MVar, at 20 kV (a) Draw the impedance diagram and indicate all impedances in per unit. Choose a base of 200 MVA, 20 kV in the generator (G) circuit (6 marks). (b) Given that $V_1 = 1.0\angle 0 pu$, calculate the real and reactive power absorbed by Load 2 in MW and MVar (3 marks).

          Q2. The one-line diagram of a simple power system is shown below. The transmission line
impedance is shown on the one-line diagram. The generator, transformers and the loads are
rated as follows: (CLO2) (9 marks * (1/3)).
Generator (G) : 200 MVA, 18 kV, X = 0.1 pu
Transformer 1 (T1) : 250 MVA, 20? / 200Y kV, X = 0.12 pu
Transformer 2 (T2) : 120 MVA, 230Y / 23? kV, X = 0.07 pu
Load1 : S1 = 120 MW + j90 MVar, at 18 kV
Load2 : S2 = 40 MW + j30 MVar, at 20 kV
(a) Draw the impedance diagram and indicate all impedances in per unit. Choose a base of 200
MVA, 20 kV in the generator (G) circuit (6 marks).
(b) Given that $V_1 = 1.0\angle 0 pu$, calculate the real and reactive power absorbed by Load 2 in MW
and MVar (3 marks).

Q2. The one-line diagram of a simple power system is shown below. The transmission line
impedance is shown on the one-line diagram. The generator, transformers and the loads are
rated as follows: (CLO2) (9 marks * (1/3)).
Generator (G) : 200 MVA, 18 kV, X = 0.1 pu
Transformer 1 (T1) : 250 MVA, 20? / 200Y kV, X = 0.12 pu
Transformer 2 (T2) : 120 MVA, 230Y / 23? kV, X = 0.07 pu
Load1 : S1 = 120 MW + j90 MVar, at 18 kV
Load2 : S2 = 40 MW + j30 MVar, at 20 kV
(a) Draw the impedance diagram and indicate all impedances in per unit. Choose a base of 200
MVA, 20 kV in the generator (G) circuit (6 marks).
(b) Given that V1 = 1.0∠ 0 pu, calculate the real and reactive power absorbed by Load 2 in MW
and MVar (3 marks).

Added by Jenny M.

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