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Figure 1: Synchronous machine configuration settings


Simulation and Results

As part of the example model setup, the user can perform three types of scenarios. The user can enable or disable three three-phase faults on different model buses.

Scenario 1: Three-phase fault on Bus 7

The first scenario is about introducing a three-phase fault on Bus 7 at 0.1s by 0.1s. This scenario gives the user an idea of reliability in power systems, and how it reacts after clearing a fault. The user can change these settings by going into the fault subsystem and changing the values of T1 and T2, configuring the fault activation and clear times, respectively. By default only this fault is enabled,  it is necessary to check the Enable option within the fault subsystem called Fault1 and also check the disable option within the faults subsystem called Fault2 and Fault3. 

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Figure 2: Fault configuration settings


The following are the results from ScopeView following the first scenario, a three-phase fault on Bus 7.

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Figure 3: Bus Voltage and Fault current with a three-phase to-ground fault at Bus 7

Figure 4: Bus 7 voltage and grid current with a three-phase to ground fault at Bus 7

Figure 5. Machine Terminal Voltages and Speeds with a three-phase to-ground fault at Bus 7

Scenario 2: Three-phase fault on Bus 12

The model is also equipped with a three-phase fault on Bus 12. Similar to scenario 1, the default times for this fault are set to activate at 0.1s and clear 0.1s later. By default this fault is disabled and only the three-phase Fault1 described in the scenario1 is enabled. To activate only this fault it is necessary to check the Enable option within the fault subsystem called Fault2 and also check the disable option within the faults subsystem called Fault1 and Fault3. 

The following are the results from ScopeView following the three-phase fault on Bus 12.

Figure 6: Bus Voltage and Fault current on Bus 7 with a three-phase to-ground fault at Bus 12


Figure 7: Bus 7 voltage and grid current with a three-phase to ground fault at Bus 12


Figure 8. Machine Terminal Voltages and Speeds with a three-phase to-ground fault at Bus 12


Scenario 3: Three-phase fault on Bus 14

The model is also equipped with a three-phase fault on Bus 14. Similar to scenario 1 and scenario 2, the default times for this fault are set to activate at 0.1s and clear 0.1s later. By default this fault is  Disabled. To activate only this fault it is necessary to check the Enable option within the fault subsystem called Fault3 and also check the disable option within the faults subsystem called Fault1 and Fault2. 

The following are the results from ScopeView following the three-phase fault on Bus 14.

Figure 9: Bus Voltage and Fault current on Bus 7 with a three-phase to-ground fault at Bus 14


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Figure 10: Bus 7 voltage and grid current with a three-phase to-ground fault at Bus 14


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Figure 8. Machine Terminal Voltages and Speeds with a three-phase to-ground fault at Bus 14