Day One
1. Basic Overview 1 hour
Discussion of Overhead Transmission Line Design considerations
" Transmission Lines as a System
o Electrical Fundamentals for Transmission Lines
o Towers, Poles, and Conductors
o Insulation
o Line Protection
" Structural Loading
" Codes and Clearances
" Standard Transmission Voltage Levels
" Environmental Impacts
2. Required Conductor Clearances 2 hours
Discussion of National Electrical Safety Code and its impact on Line Design.
" Vertical Clearances
" Horizontal Clearances
" Minimum Clearances
" Structure Clearances
" ROW Clearances
" Joint Use Clearances
" Navigable Waterway Clearances
" FAA Height Restrictions
" Sag Charts
3. Mechanical Loads on Structures 2 hours
Discussion of weather data and how lines are designed to withstand loads placed upon them from the wind, ice accretion (buildup), and in combination.
" Conductor Tension
" Wind Speed
" Ice Loading
" Construction Loads
" Potential for Uplift
" Air Break Switches
" Wireless Communication Antennas
4. Insulators 1 hour
Discussion of ceramic, glass and polymer insulators and the advantages of each.
" Suspension Type
" Post Type
" V Strings
" Switching Surges
" Lightning Surges
" Leakage Distance
" Contamination Considerations
" Insulation Coordination
" Mechanical Design Considerations
5. Conductors 2 hours
Discussion of the types of conductors (ACSR, ACAR, high strength steel, etc.) and their electrical and mechanical characteristics including ampacity, sag, allowable tensions, vibration and vibration damping.
" Conductor Selection
o Ampere Rating
o Evaluation of Losses
o Corona Levels/EMF
o Physical Loading
" Bundled Conductors
" Conductor Movement
o Insulator Swing
o Blowout
o Aeolian Vibration
o Galloping
o Ice Shedding
" Accessories
o Fittings
o Aerial Markers
o Spacers
o Dampers
" Standardization
Day Two
6. Overhead Ground Wires 1 hour
Discussion of the types of overhead ground wire (EHS, EHSS, Alumoweld, OPGW, etc.) and their effectiveness for lightning protection.
" Shielding Angle
o Positive
o Negative
" Fault Current
" Fiber Optic Communication
7. Noise 1 hour
Discussion of noise mitigation methods (Audible, RI, TVI, etc.)
" Causes and preventions
" Methods of Measurement
8. Structure Design 2 hours
Discussion of structural design of wood and steel support structures
" Loading Tables
o Vertical Loads
o Horizontal Loads
o Longitudinal Loads
" Overload Factors
" Structure Family
o Tangent Structures
o Angle Structures
o Strain Structures
o Terminal Structures
9. Foundation Design 2 hours
Discussion of foundation installation techniques and types.
" Geotechnical Surveys
" Guys and Anchors
" Lattice Towers
" Tubular Steel Poles
o Direct embedment
o Anchor Bolt Type
" Soil Types
10. Grounding 1 hour
Discussion of structure grounding methods.
" Ground Resistivity
" Ground Resistance
" Ground Rods
" Counterpoise
" Adjacent Facilities
o Other Lines
o Fences
o Pipelines
" Safety Grounds for Personnel
Day Three* (*1/2-day)
11. Environmental Coordination 1 hour
Discussion of the role of the engineers and designers in supporting environmental assessments of proposed transmission line projects.
" Construction Impacts
" Land Use
" Laydown Yards
" Access Roads
" Temporary and Permanent Impacts
" Visual Impacts
" EMF Considerations
" Plan of Development
12. Project Schedule 2 hours
Discussion of key milestones for proposed transmission line projects.
" Notice of Intent
" Preliminary Corridor Selection
" Right of Way Acquisition
" Geotechnical Surveys
" Tower Spotting
" Detailed Design
" Procurement and Shop Fabrication
" Construction
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