1 / 47

EEE 360 Energy Conversion and Transport

EEE 360 Energy Conversion and Transport. George G. Karady & Keith Holbert Chapter 4 Transmission Lines and cables. Lecture 6. 4.1 Construction. Transmission lines and cables. Extra-high-voltage lines Voltage: 345 kV, 500 kV, 765 kV Interconnection between systems High-voltage lines

lanf
Download Presentation

EEE 360 Energy Conversion and Transport

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. EEE 360 Energy Conversion and Transport George G. Karady & Keith Holbert Chapter 4 Transmission Lines and cables 360 Chapter 4 Transmission lines and cables

  2. Lecture 6 360 Chapter 4 Transmission lines and cables

  3. 4.1 Construction 360 Chapter 4 Transmission lines and cables

  4. Transmission lines and cables • Extra-high-voltage lines • Voltage: 345 kV, 500 kV, 765 kV • Interconnection between systems • High-voltage lines • Voltage: 115 kV, 230 kV • Interconnection between substations, power plants • Sub-transmission lines • Voltage: 46 kV, 69 kV • Interconnection between substations and large industrial customers • Distribution lines • Voltage: 2.4 kV to 46 kV, with 15 kV being the most commonly used • Supplies residential and commercial customers • High-voltage DC lines • Voltage: ±120 kV to ±600 kV • Interconnection between regions (e.g., Oregon-California) 360 Chapter 4 Transmission lines and cables

  5. Transmission lines and cables • Three-phase conductors, which carry the electric current; • Insulators, which support and electrically isolate the conductors; • Tower, which holds the insulators and conductors; • Foundation and grounding; and • Optional shield conductors, which protect against lightning 360 Chapter 4 Transmission lines and cables

  6. Transmission lines and cables 360 Chapter 4 Transmission lines and cables

  7. Transmission lines and cables Distribution Line 360 Chapter 4 Transmission lines and cables

  8. Transmission lines and cables 360 Chapter 4 Transmission lines and cables

  9. Transmission lines and cables Definition of Parameters 360 Chapter 4 Transmission lines and cables

  10. Transmission lines and cables 360 Chapter 4 Transmission lines and cables

  11. Transmission lines and cables Connection diagram residential Concert conduit with cables in a manhole 360 Chapter 4 Transmission lines and cables

  12. 4.2 Components of transmission lines 360 Chapter 4 Transmission lines and cables

  13. Transmission lines and cables Frequently used towers • Lattice tower, used for 220 kV and above; • Guyed lattice tower, 345 kV and above; • Tapered steel tube with cross-arm, 230 kV and below; • Concrete tower, for distribution and sub-transmission; and • Wood tower, for distribution to 220 kV 360 Chapter 4 Transmission lines and cables

  14. Aluminum Conductor Steel Reinforced (ACSR); All Aluminum Conductor (AAC); and All Aluminum Alloy Conductor (AAAC). ACSR Coductor Transmission lines and cables 360 Chapter 4 Transmission lines and cables

  15. Transmission lines and cables Insulators 360 Chapter 4 Transmission lines and cables

  16. Transmission lines and cables Insulator Chain 360 Chapter 4 Transmission lines and cables

  17. Transmission lines and cables Composite insulator. • (1) Sheds of alternating diameters prevent bridging by ice, snow and cascading rain. • (2) Fiberglass reinforced resin rod. • (3) Injection molded EPDM rubber weather sheds and rod covering. • (4) Forged steel end fitting, galvanized and joined to rod by swaging process. (Source: Sediver, Inc., York, SC) 360 Chapter 4 Transmission lines and cables

  18. Transmission lines and cables • (1) is the clevis ball, • (2) is the socket for the clevis, • (3) is the yoke plate, and • (4) is the suspension clamp. (Source: Sediver) • Figure 4.15 Line post-composite insulator with yoke holding two conductors. 360 Chapter 4 Transmission lines and cables

  19. 4.3 Cables 360 Chapter 4 Transmission lines and cables

  20. Transmission lines and cables Figure 4.16 Single-phase high-voltage cable with solid dielectric 360 Chapter 4 Transmission lines and cables

  21. Transmission lines and cables Figure 4.17 Three-phase distribution cable with solid dielectric. 360 Chapter 4 Transmission lines and cables

  22. 4.4 Transmission Line Electrical Parameters 360 Chapter 4 Transmission lines and cables

  23. Transmission lines and cables Table 4.1 ACSR cable technical data 360 Chapter 4 Transmission lines and cables

  24. Transmission line parameter Resistance Ohm/mile Table 4.1 Inductance Henry/mile Equation Capacitance Farad/mile Equation Transmission lines and cables 360 Chapter 4 Transmission lines and cables

  25. Transmission lines and cables Data from the Table 4.1 • Name Bird name Kiwi • Conductor Diameter • Resistance at 50C or 75C • Geometrical Mean Radius (GMR) 360 Chapter 4 Transmission lines and cables

  26. Transmission lines and cables Data needed for calculation • Transmission line length • Number of conductor / Bundle • Conductor diameter and GMR • Distance between phases • Conductor height 360 Chapter 4 Transmission lines and cables

  27. Transmission lines and cables Typical transmission line • Horizontal arrangement • Two ground conductors • Two conductors per bundle 360 Chapter 4 Transmission lines and cables

  28. Transmission lines and cables Resistance • Stranding increase resistance • Increases by temperature • Increases by skin effect • AC resistance higher than DC • Accurate value from Table 4.1 360 Chapter 4 Transmission lines and cables

  29. Transmission lines and cables Capacitance Two-conductor bundle Three-conductor bundle Four-conductor bundle: 360 Chapter 4 Transmission lines and cables

  30. Transmission lines and cables Inductance 4.31 Transposed line Two-conductor bundle Three-conductor bundle Four-conductor bundle: 360 Chapter 4 Transmission lines and cables

  31. Transmission lines and cables Inductance/Capacitance 360 Chapter 4 Transmission lines and cables

  32. Transmission lines and cables Inductance/Capacitance 4.31 Transposed line Two-conductor bundle Three-conductor bundle Four-conductor bundle: 360 Chapter 4 Transmission lines and cables

  33. Numerical exerciseTransmission lines Parameter calculation MATCAD 360 Chapter 4 Transmission lines and cables

  34. Transmission lines Parameter calculation MATCAD D 360 Chapter 4 Transmission lines and cables

  35. Transmission lines Parameter calculation MATCAD 360 Chapter 4 Transmission lines and cables

  36. Transmission lines Parameter calculation MATCAD 360 Chapter 4 Transmission lines and cables

  37. Transmission lines Parameter calculation MATCAD 360 Chapter 4 Transmission lines and cables

  38. Equivalent circuit 360 Chapter 4 Transmission lines and cables

  39. Transmission lines Parameter calculation MATCAD 360 Chapter 4 Transmission lines and cables

  40. Transmission lines and cables Figure 4.50 Equivalent network of a short line. 360 Chapter 4 Transmission lines and cables

  41. Transmission lines and cables Figure 4.49 Equivalent network of a medium-length line. 360 Chapter 4 Transmission lines and cables

  42. j X IS R Ir ICR Ics I VS VR C/2 C/2 Transmission lines and cables Figure 4.49 Equivalent network of a medium-length line. 360 Chapter 4 Transmission lines and cables

  43. Numerical exerciseTransmission lines Loading MATCAD 360 Chapter 4 Transmission lines and cables

  44. Transmission lines and cables • Steps of calculation (4.5.1.3) • Given data: • The power is variable, selected value is: • Load current calculation: 360 Chapter 4 Transmission lines and cables

  45. Transmission lines and cables • Steps of calculation (4.5.1.3) • Capacitive current: • Line current • Supply voltage: 360 Chapter 4 Transmission lines and cables

  46. Transmission lines and cables • Steps of calculation (4.5.1.3) • Capacitive current: • Supply/network current 360 Chapter 4 Transmission lines and cables

  47. Transmission lines and cables Figure 4.48 Equivalent network for a long transmission line. 360 Chapter 4 Transmission lines and cables

More Related