Electrical Power Transmission_ Fault analysis

Which one of line faults is the most common?

• L-G fault

• L-L fault

• L-L-G fault

• L-L-L-G fault

The main goal of fault analysis is:

• to find the magnitudes of voltages which can damage the devices.

• to identify the type of fault in the system.

• to determine the causes of the fault.

• to determine the magnitudes of the currents that existed during the fault.

Which devices can contribute fault current during a fault?

• Devices with renewable energy sources.

• Devices with mechanical components.

• Devices with energy storage.

• Devices with high power ratings.

What are the three time periods typically used to approximate time-varying reactance?

• Pre-fault, Post-fault, and Recovery.

• Subtransient, Transient, and Steady-state.

• Instantaneous, Delayed, and Continuous.

• Transient, Reactive, and Synchronous.

Which of the following simplifications are made for fault current analysis in networks? (more than 1 correct options)

• Transmission lines are represented by their series reactance.

• Transformers are represented by their leakage reactance.

• Induction motors are ignored or treated as asynchronous machines.

• Synchronous machines are modeled as a constant voltage behind direct-axis sub-transient reactance.