ELEN3001: Power System Analysis - Report Writing - Engineering Assignment Help

Assignment Task

1. 3-phase fault on Bus 1 and Bus 4.

o Information and Instruction

- S base = 100 MVA, V base = 110 kV.

- Prefault voltage = 1.05∠0° p.u at all buses

- The load (M: Motor) presents in the same manner as a synchronous machine at the fault moment.

- In your solution, present the current value in p.u and Amperes.

a) Draw the per-unit impedance diagram.

b) Calculate the Thevenin's equivalent impedance in p.u when the fault occurs at Bus 1.

c) Calculate the sub-transient fault current (????"????1)using Thevenin's method, and Calculate the fault current contribution through G (????"????1 ) and M (????"????1 ). [Bus 1 Fault]

d) When the load (M: Motor) is being operated at 100 MVA, power factor = 0.85 lagging, at 1.05pu voltage, calculate the load current (???????? ) and calculate the summation of the sub-transient current and the load current ???????? at G (????"????1 ) and M(????"????1 ). [Bus 1 Fault] (Make sure the direction of the fault current and load current.)

e) Calculate the Thevenin's equivalent impedance in p.u when the fault occurs at Bus 4.

f) Calculate the sub-transient fault current (????"????4)using Thevenin's method, and Calculate the fault current contribution through G (????"????1 ) and M (????"????4 ). [Bus 4 Fault]

g) calculate the summation of the sub-transient current and the load current ???????? at G (????"????4 ) and M(????"????4 ). [Bus 4 Fault] (Make sure the direction of the fault current and load current.)

h) Verify your calculation using Power World Simulation fault analysis.

- On Bus 4, put the Generator (because The load (M: Motor) presents in the same manner as a synchronous machine at the fault moment.)

- Put the sub-transient parameters for Generator and Motor reactance (“Internal Sequence Impedance– Positive”).

- Your fault analysis results only show the sub-transient current. The simulation runs without the load current. (with only two generators)

- The snapshots of the fault results must be attached as shown below.

: Attach the line diagram.

: Attach the snapshot of the fault analysis result of Bus 1 Fault and alalyse it.

: Attach the snapshot of the fault analysis result of Bus 4 Fault and analyse it.

• The introduction of this report is NOT required.

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