TADP 640 Transmission Line Design Advanced

Course Information:  3 credits.  Advanced structures, foundation testing and design, thermal conductor ratings, sag and tension calculation, survey methods.  This course further develops the strategies that were learned in the Introduction course and introduces advanced concepts for designing transmission lines. 

Course Description/Objectives:  

  • Week Zero: Introduction to Blackboard tools
  • Week 1: Guyed Structures  
  • Week 2: Lattice Towers     
  • Week 3: Steel Poles           
  • Week 4: Foundations (soil properties, foundations under compression)
  • Week 5: Foundations (under lateral load, under uplift)
  • Week 6: Advanced Sag and Tension
  • Week 7: Special Problems in Sag and Tension
  • Week 8: LiDAR Survey Technology, Thermal Ratings

As exercises students will be given data on a line segment and will be required to compute the conductor temperature, do a clearance assessment, and be given a task of upgrading the line to a greater MVA rating using the several techniques presented. 


Module Descriptions:

Module 1: Sag & Tension & LiDAR Survey Technology (2 weeks)


Week 1: Special problems in Sag and Tension

  • Derivation of the Catenary Hyperbolic equation
  • Calculation of conductor tension with survey points.
  • Adding / changing a structure.
  • Adding / removing conductor.
  • Moving structures.


Week 2: Advanced Sag and Tension, Thermal Ratings, LiDAR Survey  

  • Actual sag and tension behavior. 
  • Thermal Ampacity Ratings of Transmission Lines
  • Upgrading of Transmission Lines
  • LiDAR Survey Technology

Module 2: Structures (3 weeks)

Weeks 3 & 4: Lattice Towers

  • Introduction to lattice towers, anatomy of tower geometry
  • Lattice tower families
  • Analysis of truss members, two dimensional and three dimensional, Matrix methods of analysis, Tower analysis details with Software, Illustrated Examples
  • Buckling capacity of compression members, Euler's Theory, Buckling modes
  • Compression capacity of angle members, Global and local buckling, K factors, ASCE 10-97 code, Illustrated examples
  • Tension capacity of angle members, ASCE 10-97 code, Illustrated examples
  • Connection capacity under shear and bearing, ASCE 10-97 code, Illustrated examples
  • Other design considerations, ASCE 10-97 code, Tower weight calculations, Tower testing, Analysis of existing lattice towers

Weeks 4 &5: Poles

  • Analysis and Design of wood poles, NESC code requirements, Illustrated examples
  • Design of steel poles_polygonal tubular members and round members, ASCE 48-05, Illustrated examples
  • Design consideration of anchor bolts, Wood equivalent steel poles: Wood vs. steel poles: economic considerations, life-cycle costs

Week 5: Guyed Structures

  • Configurations of guyed structures: Single poles (Steel poles, Wood poles), Stub poles, Multi-pole structures,
  • Analysis and deign of guyed structures, Compression capacity, Illustrated examples

Module 3: Foundations (3 weeks)

Week 6: Geotechnical Properties

  • Methods of determining soil properties: SPT test, Pressuremeter test and other tests, Empirical correlations, Soil boring log interpretation

& Foundations under Compression

  • Bearing capacity theories, guidelines for bearing capacity of soils
  • Applications: Footings, Grillages, Worked-out examples, software and codes


Week 7: Foundations under Lateral load

  • Lateral capacity theories: Broms and Brinch-Hansen theories, Elastic analysis
  • Direct Embedment foundations, worked-out examples
  • Concrete Pier foundations, worked-out examples

& Foundations under Uplift

  • Uplift capacity theories
  • Applications: H-frames, Grillages, Footings, Screw foundations, worked-out examples, software and codes

Week 8:  Conductors and Conductor Motion

  • Conductor Stress-Strain-Creep Chart. 
  • Conductor Galloping & control.
  • Conductor Vibration & control