Power System Studies: Fault Analysis using Simulation Tool

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Solution A: The simulation tool plays important role for the power system studies. The
designing of power system involves lots of Data and their processing need to be done
within fraction of time with high accuracy indeed. Tools like MATLAB, PsCAD, ETAP,
EMTP, PSS etc. very important and useful tool for the power system protection studies.
The setting of relay can be done with the software simulation, setting 2,3 or 10 relay can be
done on paper with hand calculation but when interconnected power system need to be
studied the computer simulation plays important role. Relay setting task need so much
attention since it involves with the protection of power system, CT ratio, CB rating, fuse
rating and the impedance of network are key parameter need to be considered.
Solution B: For the given network below data are not provided so with the assumption of
suitable data related to the given network are assumed. Since long line network is assumed
line voltage and line impedance are chosen according to 220 kV line data with total
impedance rather than specifying the line length.

Figure 1 Given Network
Suitable data are selected for generator G1, G2, and transformer T1,T2. The line impedance
of 50 ohm and 75 ohm also selected for line sections. The single line diagram with naming
of generator and transformer with their type of connection (star grounded) and delta star is
specified in below diagram.

Figure 2 Single Line Diagram
G1 200 MVA, 20kV, Xd=15%
G2 300 MVA, 20kV, Xd=20%
T1 300 MVA, 220/22 kV, X=10%
T2 300 MVA, 220/22 kV, X=10%
The base MVA of the network is chosen =300 MVA
The HV side of transformer T2 is connected in star configuration. The available rated
voltage 220kV and other side is 22 kV
The generator G2 base voltage is 20 kV and between transformer T2 and bus 5 is