Question for X15REE exam (download|REE_questions.doc): 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: Compensation\\ Waves on lines \\ Static stability\\ Voltage losses\\ Nodal networks\\ Short-circuits\\

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REE_questions.doc

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