Module Three - Alternating Current and Three-Phase Systems - NCCER Substation Slides

Module Three - Alternating Current and Three-Phase Systems - NCCER Substation Slides

1. Alternating Current and Three-Phase Systems Module Three – 80201-11

2. Objectives When you have completed this module, you will be able to do the f ollowing: Describe how single-phase and three-phase alternating current is developed . Calculate the peak and effective voltage or current values for an AC waveform. Describe phase relationships in AC circuits. Describe impedance and explain how it affects AC circuits. Describe the operating principles and functions of inductors. Describe the operating principles and functions of capacitors. Explain the principles and functions of transformers. Explain the following terms as they relate to AC circuits: • True power • Apparent power • Reactive power • Power factor

3. Figure 1 – Conductor moving across a magnetic field

4. Figure 2 – Angle versus rate of cutting lines of flux

5. Figure 3 – One cycle of alternating voltage

6. Figure 4 – Amplitude values for a sine wave

7. Figure 5 – Frequency measurement

8. Figure 6 – Root-mean-square ( rms ) amplitude

9. Figure 7 – Voltage waveforms 90 degrees out of phase

10. Figure 8 – Waves in phase

11. Figure 9 – Resistive AC circuit

12. Figure 10 – Voltage and current in a resistive AC circuit

13. Figure 11 – Factors affecting the inductance of a coil

14. Figure 12 – Inductor voltage and current relationship

15. Figure 13 – Capacitors

16. Figure 14 – Charging and discharging capacitor

17. Figure 15 – Capacitors in parallel

18. Figure 16 – Capacitors in series

19. Figure 17 – Voltage and current in a capacitive AC circuit

20. Figure 18 – Summary of AC circuit phase relationships

21. Figure 19 – Power calculations in an AC circuit

22. Figure 20 – RLC circuit calculation

23. Figure 21 – Power triangle

24. Figure 22 – Basic components of a transformer

25. Figure 23 – Transformer action

26. Figure 24 – Steel laminated core

27. Figure 25 – Cutaway view of a transformer core

28. Figure 26 – Transformer winding polarity

29. Figure 27 – Transformer turns ratio

30. Figure 28 – Tapped transformers

31. Figure 29 – Importance of an isolation transformer

32. Figure 30 – Autotransformer schematic diagram

33. Figure 31 – Current transformer schematic diagram

34. Figure 32 – Potential transformer

35. Figure 33 – Three-phase voltage development

36. Figure 34 – Wye-wye arrangement

37. Figure 35 – Closed delta arrangement

38. Figure 36 – Delta-wye arrangement

39. Figure 37 – Three-phase transformer connections

40. Supplemental Art

41. Course Map

42. Effective Voltage

43. Turns and Voltage Ratios

44. Power Distribution