Symmetrical Fault Analysis Interview Questions:
Following are the below Symmetrical Fault Analysis Interview Questions and Important Questions which is very useful for interviews and exams
1. Obtain an expression for generation of an unsymmetrical alternating current in a series R-L circuit when switch is closed to retain normal operation of power system. The circuit is energized by a sinusoidal ac source of (Vm sin ωt + α).
2. Describe and derive the equation of short circuit when there is short circuit transient on a transmission line ? Also describe the doubling effect.
3. Discuss the transient on a transmission line.
4. What do you understand by instantaneous maximum momentary current for line ? Explain it with the help of suitable diagram.
5. Discuss and explain the subtransient, transient and steady state reactances when a sudden 3-phase short circuit occurs at the generator terminals.
6. Write short note on the reactances of an alternator when sudden 3-phase short circuit occurs on its terminals.
7. Draw equivalent circuits of synchronous machine under subtransient, transient and steady-state conditions.
8. A 3-Φ short circuit occurs at the terminals of a synchronous motor. Explain with justification whether the machine will continue to act as motor ?
9. Draw a figure showing the variation of current in any one phase of an unloaded 3-phase alternator with respect to time for a sudden three-phase short circuit at the terminals of the alternator. Explain why does the current follow the shape shown in figure.
10. What are the different steps for the calculation of short-circuit kVA and short-circuit fault current.
11. Explain the steps involved in the symmetrical fault calculations. How can the load current be taken into account in fault calculations ?
12. List out the methods of reducing short-circuit current.
13. Why we do use reactors in power system ? Discuss their advantages.
14. What are limiting reactors ? Discuss their applications and location aspects.
15. Discuss the various strategic locational aspects of reactors for limiting the fault current and their advantages.
16. Discuss the use and location of current limiting reactors in a power system.
17. Describe various applications, locations and design features of current limiting reactors.
18. Compare the performance of ring bus-bar reactors and tie-bar reactors in power systems for limiting short-circuit currents.
19. Write short notes on the following :
- Short-circuit capacity.
- Transient on a transmission line.
- Analysis of symmetrical faults in power system networks.
- Bus-bar reactors and their locations.