(b) For a 4-bus 3-phase, 100 kV, 50 Hz power system, the following Y-bus and corresponding Z-bus matrix are obtained using bases of 100 MVA and 100 kV. - j28.333 j5 j6.667 j10 - j28.333 j6.667 pu. j5 j10 Ybus = j6.667 j10 - j16.667 j0 ло j6.667 j0 - j16.667 j0.0903 j0.0597 j0.0719 j0.0780] j0.0597 j0.0903 j0.0780 j0.0719 Zbus = j0.0719 j0.0780 j01356 j0.0743 Lj0.0780 j0.0719 j0.0743 j0.1356] pu. A symmetrical three-phase fault occurs at bus 4. By assumming prefault voltages to be at nominal values and prefault current to be zero, determine fault currents (in A) at bus 4 and voltages (in V) at all buses during fault if the fault is: (i) solid (bolted) fault. (ii) through reactance of 10 Q to the ground. (iii) Give comment based on your observation on the differences between results obtained from parts (i) and (ii) above.
Load flow analysis
Load flow analysis is a study or numerical calculation of the power flow of power in steady-state conditions in any electrical system. It is used to determine the flow of power (real and reactive), voltage, or current in a system under any load conditions.
Nodal Matrix
The nodal matrix or simply known as admittance matrix, generally in engineering term it is called Y Matrix or Y bus, since it involve matrices so it is also referred as a n into n order matrix that represents a power system with n number of buses. It shows the buses' nodal admittance in a power system. The Y matrix is rather sparse in actual systems with thousands of buses. In the power system the transmission cables connect each bus to only a few other buses. Also the important data that one needs for have a power flow study is the Y Matrix.
Types of Buses
A bus is a type of system of communication that transfers data between the components inside a computer or between two or more computers. With multiple hardware connections, the earlier buses were parallel electrical wires but the term "bus" is now used for any type of physical arrangement which provides the same type of logical functions similar to the parallel electrical bus. Both parallel and bit connections are used by modern buses. They can be wired either electrical parallel or daisy chain topology or are connected by hubs which are switched same as in the case of Universal Serial Bus or USB.
![(b)
For a 4-bus 3-phase, 100 kV, 50 Hz power system, the following Y-bus and
corresponding Z-bus matrix are obtained using bases of 100 MVA and 100 kV.
[- j28.333
j5
j6.667
j10
j5
- j28.333
j10
j6.667
Ybus
p.u.
j6.667
j10
- j16.667
j0
j10
j6.667
j0
- j16.667
[ j0.0903 j0.0597 j0.0719 j0.0780
Zbus
j0.0597 j0.0903 j0.0780 j0.0719
pu.
j0.0719 j0.0780 j01356 j0.0743
Lj0.0780 j0.0719 j0.0743 j0.1356]
A symmetrical three-phase fault occurs at bus 4. By assumming prefault voltages to
be at nominal values and prefault current to be zero, determine fault currents (in A) at
bus 4 and voltages (in V) at all buses during fault if the fault is:
(i)
solid (bolted) fault.
(ii)
through reactance of 10 Q to the ground.
(iii)
Give comment based on your observation on the differences between results
obtained from parts (i) and (ii) above.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F34428c1e-16bb-411a-b14a-221e7801c407%2Fde7da6f7-31ef-4f18-94e1-c57eb9d7854d%2Fe0nvv9_processed.png&w=3840&q=75)
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