Definition Sheet (PDF)


Overhead transmission lines are subjected to extreme events that may damage line sections and affect power supply to customers. Even when the best design criteria are met, there continues to be a risk of extensive damage to overhead lines when structural loads exceed the design criteria.  Experiences with several devastating events such as the ice storm in Canada and the north eastern U.S. in 1998, the major wind storm event in France in 1999 and the major icing event in China in 2008, along with hurricanes and high intensity winds (HIW) recently occurring in many countries, have demonstrated the significant devastation that severe weather causes to transmission systems. These problems may best be addressed by a better understanding of these issues through gaining knowledge in the subject areas, improving current technologies and by sharing needed research efforts as well as closing the existing “knowledge gaps” in the industry.  The objective of this interest group is to develop and share strategies to deal with overhead transmission line design issues and to mitigate the impact of extreme events, develop benchmarks for increased utilization of existing lines as well as the design of new lines, address corrosion of transmission components, develop containment strategy against line cascade and develop technologies to reduce life cycle costs.

Topics and Issues:

  • Extreme Events
  • Maximizing Availability/ Utilization of ExistingTransmission Lines
  • Investigation of New Technologies
  • Development of New Transmission Lines – Constraints: Environmental, Visual, Structural
  • Understanding Resiliency Issues and its Impact on LineDesign
Program Services
  • Networking & Information Sharing

    • Annual face-to-face Business Meetings with webinar call-in options
    • 4-5 conference calls and learning webinars
    • Access to a network of ~1,000 electrical utility peers from around the world
  • Industry Benchmarking

    • Requests for Information where your questions or concerns are circulated to other group
      participants with rapid-fire response rates
    • Internal benchmarking surveys for state-of-the-industry intelligence
  • Collaborative Technical Projects

    • The flexibility to support only those projects which are relevant to your organization, meaning you know exactly, where your research dollars are going
    • Supported by CEATI management, participating utilities and consultants work together across all phases of a project’s life-cycle, ensuring your organization receives practical, high-quality deliverables
  • Unparalleled Return on Investment

    • Ability to split project funding costs with other organizations, resulting in highly-leveraged funding opportunities
    • Reduced pricing on published reports, training courses, and industry-open conferences
Project Portfolio

Ongoing Projects

T213700 33/136
Line Ampacity Using Seasonal Weather Data
T213700 33/135
Seismic Adequacy of Steel Tubular Pole Structures
T203700 33/134
Determination of Reserve Capacity of Existing Structures Considering Site Specific Wind Loads
T203700 33/133
Application of New Innovative Materials in Line Design – Its Effectiveness in Improving Reliability and Performance
T203700 33/132
Mitigation of Line Deterioration
T203700 33/131
Development of Fragility Models for Key Line Components
T203700 33/130
Life Cycle Cost Evaluation of Transmission Lines
T203700 3398B-8
TODEM 3398B Section 8 - Construction: Issues and Challenges
T203700 3398B-7
TODEM 3398B Section 7 - Vibration Issues and Mitigations
T203700 3398B-4
TODEM 3398B Section 4 - Line/Structure Configuration - Its Impact on Line Design
T203700 3398B-5
TODEM 3398B Section 5- Mechanical Design of EHV Line Insulators and Hardware Fitting
T203700 4105
A Comparison of Phodar vs. LiDAR - Advantages and Disadvantages of Each
T193700 33/129
Self-Damping Measurement of HTLS Conductor
T193700 33/128
Development of Vulnerability Assessment of Line Components and Line Exposures to Extreme Events
T193700 33/127
Transmission Line Structures Under Downbursts and Tornadoes
T193700 33/126
Selection Criteria of Backfill Materials and its Impact on Assessing Foundation Capacity
T193700 33/125
Vibration of Tower Structures
T193700 33/124
Guidelines for Appropriate Sampling Techniques in Inspection of Line Components for Risk Assessment
T193700 3398B-3
TODEM 3398B Section 3 - The Challenge in Route Selection, Siting Process & Environmental Issues
T183700 33/123
Calibration of Overhead Lines Based on Reliability Based Design Philosophy

Completed Projects

T183700 3399B
State of the Art Report on Design Practices for Long Span/Tall Transmission Tower Systems
T173700 33/114
Guidelines for Optical Ground Wire Technology
T173700 33/116
Review of Sensor Technologies in Monitoring Foundation Movements, Vibration Detection, Insulator Leakage and Ampacity
T173700 33/115
Innovative Visual Designs of Transmission Structures for Better Public Acceptance
T173700 33/113
Understanding and Development of a Database for Line Failures
T173700 3272
CPF: Guidelines for Managing Transmission Line Clearances
T163700 3270
New Below Ground Coatings For Direct Embedded Steel Pole Transmission Line Structures And Assessment Of Existing Coatings And Methods Of Repair
T163700 33/111
Guidelines for Assessment of Existing Foundations
T163700 33/108A
Impact of Climatological Influences on Overhead Line Design
T163700 33/109
Numerical Simulation of Transmission Line Vibration Caused by Ice Shedding
See all reports

Webinar Library

Maximizing Transmission Capabilities on Existing Right of Ways
Available to Utilities Only   Get Access
June 2021
Structural Analysis and Design of Slip-Joint Connections in Polygonal Transmission Steel Poles
Available to Utilities Only   Get Access
May 2021
Pro-active Corrosion Control Management
Available to Utilities Only   Get Access
July 2020
Application Guide for Wind Speed-Up Factors for Transmission Line Towers
Available to Utilities Only   Get Access
May 2020
The 10% + 2 Feet Rule for Pole Foundations
Available to Utilities Only   Get Access
February 2020
Technologies and Policies for Grid Reliability & Resilience
Available to Utilities Only   Get Access
November 2019
Vibratory Caissons
Available to Utilities Only   Get Access
September 2017
Fiber-optic sensing system for icing detection and dynamic ampacity rating on overhead power lines
Available to Utilities Only   Get Access
February 2016
Dynamic Line Rating using SMARTLINE™ Ratings
Available to Utilities Only   Get Access
May 2013
Summer Conference Call
Available to Utilities Only   Get Access
July 2011
Upcoming Events
TODEM Fall 2021 General Meeting
Attendance Open to Electrical Utilities   Request Invitation
October 2021
Ampacity and Dynamic Line Rating – Innovations and New Technologies Workshop
Attendance Open to Electrical Utilities   Request Invitation
November 2021 in GoToWebinar