Question for X15REE exam:

1. Symmetrical components, importance, utilization

2. Single-phase-to-earth short circuit (components diagram, equations)

3. Phase-to-phase short circuit (components diagram, equations)

4. Three-phase short circuit (components diagram, equations)

5. Double-phase-to-earth short circuit (components diagram, equations)

6. Homogenous powerline, characteristic impedance, propagation constant, Blondel constants

7. T-network – graphically and numerically

8. π-network - graphically a numerically

9. Static stability

10. Dynamic stability

11. Overhead powerline parameters – longitudinal

12. Overhead powerline parameters – cross

13. Direct current powerlines, voltage drops calculations (addition and superposition method)

14. Three-phase powerlines, voltage drops calculations

15. Node voltage method, admittance matrix

16. Waves on lines – reflection on the open and short-circuit end

17. Waves on lines – transmission through the cable-powerline boundary

18. Waves on lines – cross capacity

19. Waves on lines – cross resistance

20. Relations among protected object, protection and surroundings

21. Protected objects - models

22. Protection types, characteristics and equations

23. Basic protection elements

24. Overcurrent number

25. Basic principle of bimetal, short-circuit and cataract release

26. Type of busbar systems

27. Combined busbar switches

28. Transfer (help) busbar

29. Substations without busbars

30. Thermal and force effects of short-circuit currents, wire dimensioning

31. Grounding

32. Reactive power compensation

3 theoretical questions + 2 calculations time: 1-1,5 hours

Calculation problems:

Přílohy

REE_questions.doc

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