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. -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
REE_questions.doc | 33792 bytes |