Level 6 Graduate Diploma in Engineering (9210-01) - City & Guilds

8. Draw the sequence networks for different winding connections for given generator and
transformers.
9. Draw the sequence network for a given transmission system.
10. Identify different types of unbalanced faults and write down the basic equations for unbalanced
faults.
11. Calculate unsymmetrical fault currents with and without fault impedance.
Stability in electrical systems
12. Write swing equation of synchronous generator.
13. Explain transient stability and steady state stability.
14. Write power angle equation for simple systems for the pre-fault, during the fault and post fault
situations.
15. Calculate critical clearing angle and critical clearing time for single machine systems using equal
area criteria.
Protection of power systems
16. Explain protective relaying, protective zones, back-up protection, selectivity and reliability.
17. Classify relays by type, by time of operation and actuating quantities.
18. Distinguish between relay unit, protective scheme and protective system.
19. Explain the basic concepts protection of generators, transformers and transmission lines.
20. Perform simple calculations involving current transformers and potential transformers.
21. Carry out calculations involving in over current protection, distance protection and differential
protection.
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