Overview

The Overhead Transmission Design Interest Group is a consortium of electric utilities that captures knowledge on overhead transmission line design issues and conducts applied R&D to foster knowledge, practical solutions, and benchmarking with peers.

This interest group also focuses on developments under a sustainable-based design approach for overhead lines.

Focus areas

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    Extreme Events
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    Maximizing Availability/Utilization of Existing Transmission Lines
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    Investigation of New Technologies
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    Development of New Transmission Lines – Constraints: Environmental, Visual, and Structural
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    Understanding Resiliency Issues and Their Impact on Line Design
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    Electrical Aspects of Line Design

This group is for

Overhead transmission design and standards engineers
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Technical Advisor Support
Asim Haldar
Asim Haldar
Overhead Transmission Design

Asim Haldar received his MEng and PhD in Ocean Engineering from the Memorial University of Newfoundland, with a specialization in behavior of offshore structures. Prior to his retirement in 2014, he was the Manager of Research and Development (R & D) in the Engineering Services Division of Nalcor Energy. He had previously been a lead engineer in the design and upgrading of more than 1500km of existing and new HV and EHV lines, working in the utility industry for more than 45 years. Dr. Haldar has conducted numerous studies in the areas of conductor dynamics, reliability-based optimization, cascade mitigations, sensor-based monitoring of wind and ice loads on a full-scale overhead test line, full scale foundation tests and risk-based asset management. Asim has published more than 100 technical papers and reports in his field of expertise (overhead line design issues and behavior of offshore structures). Dr. Haldar also guided the publication of more than 50 research reports as a Technical Advisor to CEATI. He is also the Founder and CEO of Haldar & Associates, Inc., a consulting company focused on providing engineering services to the utility industry including educational training courses.

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Gil Mourant
Gil Mourant
Overhead Transmission Equipment

Gil Mourant, P. Eng., is a consulting civil engineer with over 40 years’ experience in transmission line design, inspection, construction and testing, in Canada and internationally. He recently retired as VP Engineering and Special Projects with Valard Construction. Previously served as Transmission Line consultant for Teshmont Consultants. In his roles, he provided engineering leadership with senior management skills and technical insight on design and construction, ensuring projects achieved their goals of technical competency, quality, budget, schedule and risk mitigation. He continues to provide consulting services in a technical advisory capacity to CEATI.

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Top Resources
RESEARCH REPORT
White Paper on Resiliency
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This white paper provides insights on practical applications of key resiliency concepts in power systems, addressing issues of resiliency quantification, robustness, redundancy, response and recovery, reliability, and the relevant challenges and opportunities in integrating these with national resiliency goals, climate change policy, and regulatory frameworks. It also highlights and investigates some key barriers to achieving resilient power systems and, more specifically, resilient transmission line systems.
RESEARCH REPORT
Calibration of Overhead Lines Based on Reliability Based Design Philosophy
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This project develops a state-of-the-art framework for calibrating overhead transmission lines using a reliability-based design (RBD) philosophy. It compares legacy allowable stress design (ASD) and RBD approaches to assess additional capacity and remaining asset life of existing lines. Analyses cover steel towers, H-frame wood poles, and tubular poles, and incorporate meteorological loading models and return period methodologies used in North American standards (NESC, CSA).
GUIDANCE DOCUMENT
Best Practices Guide for Extra High Voltage AC Transmission Lines - Electrical Aspects of EHV Line Design
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This project develops a best practices guide for the electrical design of extra high voltage (230–765 kV) AC transmission lines. Based on a critical review of current technical information and recent advancements, Phase 1 covers key electrical considerations, including power system fundamentals, corona effects, EMF, conductor selection, insulation coordination, and lightning. A second phase will address mechanical design aspects.
TRAINING
Overhead Transmission Line Foundation Design Training Series
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CEATI’s seven-session Overhead Transmission Line Foundation Design Training Series equips line designers with foundational and advanced knowledge to support modernized overhead transmission infrastructure. The program covers geotechnical principles, design philosophy, and multiple foundation types, including drilled shafts, direct embedment, grillage, helical piles, and anchors, with both hand calculations and software examples.
GUIDANCE DOCUMENT
Optimal Placement of Anti-Cascading Structures in Overhead Line Design
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This report presents a systematic methodology to determine containment loads on surviving structures after a cascade event and to identify the optimal placement of anti-cascade structures capable of resisting those loads. It also examines failure modes, industry practices, relevant design standards, and case studies, and includes a literature review of mitigation strategies using anti-cascade devices to reduce cascade risk.