Generator Fault Level Calculation

[vabworld]

How to calculate fault level for generator source? What all technical parameters required for the same?

[aaronzachariah · Accepted solution]

To calculate fault level for a generator source, you'll need to consider several technical parameters. These include:

1. Generator Rating (MVA or kVA): This is the capacity of the generator.

2. Generator Impedance (in per unit): It represents the internal impedance of the generator and can be obtained from the manufacturer's data.

3. Short-Circuit Time (in seconds): The time it takes for protective devices to clear a fault.

4. Short-Circuit Current (in kA): This depends on the generator's capacity, impedance, and the system voltage.

5. System Voltage (kV): The voltage at which the generator operates.

6. Transformer Impedance (if applicable): If there's a transformer between the generator and the fault point, its impedance needs to be considered.

Once you have these parameters, you can use various methods like the per-unit system or symmetrical components to calculate the fault level. Remember to consult with a qualified electrical engineer or use appropriate software for precise calculations.