In relation to AC transmission system, (a) Assuming a lossless short line has a reactance of X, discuss (using phasor diagrams that show receiving & sending end voltages and voltage drops across R &X) the impact of the following actions on the receiving end voltage and on voltage regulation when: (i) A lagging power factor load at the receiving end is increased. (ii) A unity power factor load at the receiving end is increased. (iii) A leading power factor load at the receiving end is increased.

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Q2.
In relation to AC transmission system,
(a) Assuming a lossless short line has a reactance of X, discuss (using phasor
diagrams that show receiving & sending end voltages and voltage drops
across R &X) the impact of the following actions on the receiving end
voltage and on voltage regulation when:
(i) A lagging power factor load at the receiving end is increased.
(ii) A unity power factor load at the receiving end is increased.
(iii) A leading power factor load at the receiving end is increased.
(b) For the system that is shown in Figure Q2, use all relevant data from the
diagram to:
(i) Discuss the reasons that caused the reactive power to flow back
into the generator and the necessary actions that may be taken to
avoid this occurrence.
(ii) Discuss the changes that may occur under surge impedance loading
of the system in Figure Q2 and the reasons for these changes. Use
relevant equation/s to support your discussion and in so doing you
may assume that the line is lossless.
Total system losses
47.19 MW
One
Two
1039MW
O Mvar
1086 MW
1086.20 MW
1039.00 MW
-193 Mvar
-193.43 Mvar
-0.00 Mvar
Amps
0.97 pu
-10.66 deg
1.00 pu
0.00 Deg
Figure Q2 A two bus power system.
Transcribed Image Text:Q2. In relation to AC transmission system, (a) Assuming a lossless short line has a reactance of X, discuss (using phasor diagrams that show receiving & sending end voltages and voltage drops across R &X) the impact of the following actions on the receiving end voltage and on voltage regulation when: (i) A lagging power factor load at the receiving end is increased. (ii) A unity power factor load at the receiving end is increased. (iii) A leading power factor load at the receiving end is increased. (b) For the system that is shown in Figure Q2, use all relevant data from the diagram to: (i) Discuss the reasons that caused the reactive power to flow back into the generator and the necessary actions that may be taken to avoid this occurrence. (ii) Discuss the changes that may occur under surge impedance loading of the system in Figure Q2 and the reasons for these changes. Use relevant equation/s to support your discussion and in so doing you may assume that the line is lossless. Total system losses 47.19 MW One Two 1039MW O Mvar 1086 MW 1086.20 MW 1039.00 MW -193 Mvar -193.43 Mvar -0.00 Mvar Amps 0.97 pu -10.66 deg 1.00 pu 0.00 Deg Figure Q2 A two bus power system.
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