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

T193700 33/128
A General Framework for GIS based Vulnerability Assessment of Overhead Lines under Extreme Events
T193700 33129
Self-Damping Measurement of HTLS Conductor
T193700 33127
Transmission Line Structures Under Downbursts and Tornadoes
T193700 33126
Selection Criteria of Backfill Materials and its Impact on Assessing Foundation Capacity
T193700 33125
Vibration of Tower Structures
T193700 33124
Guidelines for Appropriate Sampling Techniques in Inspection of Line Components for Risk Assessment
T183700 3398B
Best Practices Guide for EHV AC Transmission Lines (230 kV - 765 kV)
T183700 3256B
Additional Example Problems for Tubular Pole Corrosion
T183700 33123
Calibration of Overhead Lines Based on Reliability Based Design Philosophy
T183700 33122
Comparative Evaluations of Direct Embedment, Drilled Shafts and Steel Caisson Foundations for Tubular Steel Pole Structures
T183700 33121
Operating Limit for Conductor Temperature and its Impact on Splices
T183700 33120
Galloping Mitigation – Performance Evaluation of Various Anti-Galloping Control Devices
T183700 33119
Vibration Effects on Overhead Line Splices
T173700 33117
Understanding Ground Anchoring Systems for Overhead Line Foundations
T163700 33110
Residual Life Estimation of NCI Insulators
T163700 33109
Dynamic Loads on Lines due to Ice Shedding Phenomenon
T153700 33104
Guidelines to Establish Reliability of Existing Transmission Lines
T143700 3396
Transmission Line Corrosion Control Manual- Grillage Foundations, Anchor Rods and Direct Embedded Steel Members

Completed Projects

T183700 3399B
State of the Art Report on Design Practices for Long Span/Tall Transmission Tower Systems
T173700 33114
Guidelines for Optical Ground Wire Technology
T173700 33116
Review of Sensor Technologies in Monitoring Foundation Movements, Vibration Detection, Insulator Leakage and Ampacity
T173700 33115
Innovative Visual Designs of Transmission Structures for Better Public Acceptance
T173700 33113
Understanding and Development of a Database for Line Failures
T173700 3272
TR: 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 33111
Guidelines for Assessment of Existing Foundations
T163700 33108A
Impact of Climatological Influences on Overhead Line Design
T163700 33112
Guidelines for Compact Line Design
See all reports

Webinar Library

The 10% + 2 Feet Rule for Pole Foundations
Available to Utilities Only   Get Access
January 2020 - November -0001
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
Upcoming Events
TODEM Workshop: Understanding Innovative Digital Technology in Overhead Line Design
Attendance Open to Electrical Utilities   Request Invitation
March 2020 in Chicago, IL
TODEM Spring 2020 Meeting
Attendance Open to Electrical Utilities   Request Invitation
March - April, 2020 in Chicago, IL
Transmission Conference: Climate Change Impact and Resiliency of the Transmission Line Grid
Click for more info....
Attendance Open to All
November 2020 in San Diego, CA
TODEM 2020 Fall General Meeting
Attendance Open to Electrical Utilities   Request Invitation
November 2020 in San Diego, CA