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Figure 11.1 A basic three-phase circuit.

Figure 11.1 A basic three-phase circuit. Figure 11.2 Phasor diagrams of a balanced set of three-phase voltages. (a) The abc (positive) sequence. (b) The acb (negative) sequence. Figure 11.3 A sketch of a three-phase voltage source.

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Figure 11.1 A basic three-phase circuit.

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  1. Figure 11.1 A basic three-phase circuit.

  2. Figure 11.2 Phasor diagrams of a balanced set of three-phase voltages. (a) The abc (positive) sequence. (b) The acb (negative) sequence.

  3. Figure 11.3 A sketch of a three-phase voltage source.

  4. Figure 11.4 The two basic connections of an ideal three-phase source. (a) A Y-connected source. (b) A -connected source.

  5. Figure 11.5 A model of a three-phase source with winding impedance: (a) a Y-connected source; and (b) a  -connected source.

  6. Figure 11.6 A three-phase Y-Y system.

  7. Figure 11.7 A single-phase equivalent circuit.

  8. Figure 11.8 Line-to-line and line-to-neutral voltages.

  9. Figure 11.9 Phasor diagrams showing the relationship between line-to-line and line-to-neutral voltages in a balanced system. (a) The abc sequence. (b) The acb sequence.

  10. Figure 11.10 The single-phase equivalent circuit for Example 11.1.

  11. Figure 11.11 A single-phase equivalent circuit.

  12. Figure 11.12 A circuit used to establish the relationship between line currents and phase currents in a balanced  load.

  13. Figure 11.13 Phasor diagrams showing the relationship between line currents and phase currents in a -connected load. (a) The positive sequence. (b) The negative sequence.

  14. Figure 11.14 The single-phase equivalent circuit for Example 11.2.

  15. Figure 11.15 A balanced Y load used to introduce average power calculations in three-phase circuits.

  16. Figure 11.16 A -connected load used to discuss power calculations.

  17. Figure 11.17 The single-phase equivalent circuit for Example 11.5.

  18. Figure 11.18 The key features of the electrodynamometer wattmeter.

  19. Figure 11.19 A general circuit whose power is supplied by n conductors.

  20. Figure 11.20 A circuit used to analyze the two-wattmeter method of measuring average power delivered to a balanced load.

  21. Figure 11.21 A substation connected to a power plant via a three-phase line.

  22. Figure 11.22 A single phase equivalent circuit for the system in Fig. 11.21.

  23. Figure P11.6

  24. Figure P11.8

  25. Figure P11.10

  26. Figure P11.17

  27. Figure P11.18

  28. Figure P11.20

  29. Figure P11.30

  30. Figure P11.31

  31. Figure P11.39

  32. Figure P11.41

  33. Figure P11.46

  34. Figure P11.48

  35. Figure P11.50

  36. Figure P11.51

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