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.
Short Transmission Line
A short transmission line is a transmission line that has a length less than 80 kilometers, an operating voltage level of less than 20 kV, and zero capacitance effect.
Power Flow Analysis
Power flow analysis is a topic in power engineering. It is the flow of electric power in a system. The power flow analysis is preliminary used for the various components of Alternating Current (AC) power, such as the voltage, current, real power, reactive power, and voltage angles under given load conditions and is often known as a load flow study or load flow analysis.
Complex Form
A power system is defined as the connection or network of the various components that convert the non-electrical energy into the electric form and supply the electric form of energy from the source to the load. The power system is an important parameter in power engineering and the electrical engineering profession. The powers in the power system are primarily categorized into two types- active power and reactive power.
![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.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F7657d60a-4450-4353-9dbc-163d3840656e%2F22592851-419f-4bfd-9fa6-98051488ead5%2Ftoikiam_processed.png&w=3840&q=75)
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