Study of unsymmetrical fault (L-G) analysis using power world simulator.

Experiment No. 07

Aim of the Experiment: –

Study of unsymmetrical fault (L-G) analysis using power world simulator.

Apparatus Required: –

  1. Power World Simulator installed in a Computer System.

Diagram: –

Fig. No. 1
Fig. No. 2
Fig. No. 3
Fig. No. 4
Fig. No. 5
Fig. No. 6
Fig. No. 7
Fig. No. 8
Fig. No. 9
Fig. No. 10
Fig. No. 11
Fig. No.12
Fig. No. 13

Theory: –

The faults on the power system which give rise to unsymmetrical fault currents (i.e. unequal fault currents in the lines with unequal phase displacement) are known as unsymmetrical faults.

On the occurrence of an unsymmetrical fault, the currents in the three lines become unequal and so there is a phase displacement among them.

There are three ways in which unsymmetrical faults may occur in a power system: –

a. Single line-to-ground fault (L-G)

b. Line-to-line fault (L-L)

c. Double line-to-ground fault (L-L-G)

Procedures: –

  1. Launch Power World Simulator: Open Power World Simulator on your computer.
  2. Create a New Case: Create a new case in Power World Simulator to start your analysis.
  3. Define the Buses: Define the four buses (Bus 1 to Bus 3) in the case. Assign bus types: Bus 1 as the slack bus, Bus 2  as generator bus.
  4. Define the Transmission Lines: Create the transmission lines that connect the buses. Specify the line parameters such as resistance, reactance, and line charging.
  5. Set Generator Parameters: Define the generator parameters for the generator buses (Bus 2 and Bus 1). Specify the base MVA, voltage limits, and generation limits for each generator.
  6. Set Fault Scenario: Select the fault scenario you want to analyze, such as a three-phase fault, phase-to-ground fault, or phase-to-phase fault. Determine the fault location by selecting the buses and phases involved in the fault.
  7. Configure Fault Parameters: Specify the fault impedance, fault location, and fault clearing time. Set these parameters based on the fault scenario you selected.
  8. Run Unsymmetrical Fault Analysis: Initiate the unsymmetrical fault analysis in Power World Simulator. The software will calculate the fault currents, voltages, and power flows during the fault condition. It will determine the faulted bus voltages and the currents flowing through the transmission lines, generators, and loads.
  9. Analyze the Results: Study the results obtained from the unsymmetrical fault analysis. Examine the fault currents and voltages to understand the magnitude and flow of faulted currents in the system. Analyze the impact of the fault on voltage stability, system protection, and relay coordination. Identify areas of high fault current and potential equipment damage.
  10. Visualize the Results: Use Power World Simulator’s visualization tools to graphically represent the fault analysis results. Generate one-line diagrams, phasor diagrams, or other graphical representations to visualize the fault currents, voltages, and power flows. This will help you better understand and communicate the analysis outcomes.

Observation Table: –

See Fig. No. 12 & Fig. No. 13

Conclusion: –

To be written by student.

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