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.
SOFTWARE
Numerical Simulations of Cascade and Mitigation by Load Control and Load Reduction Devices
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This research project aims to develop a “user-friendly software,” based on numerical models, to study the transient response of the conductor and its effect on the tower after a break. The transient response will be simulated with and without the load reduction and load control devices. Several of these devices, including sliding clamps, will be considered in developing the model and response evaluations. The numerical model will be validated by using the available published test data. It is expected that the final model will be able to predict the cascade potential based on load redistribution and hence the cascade length (zone). This project is an extension of an earlier CEATI project aimed at understanding the impact of various load control devices on dynamic loads and response sensitivities.
GUIDANCE DOCUMENT
Corrosion Manual on Steel Towers and Grillage Foundations
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This report provides a high-level summary of practical guidelines to address corrosion issues in steel structures of electric power transmission and distribution (T&D) lines. The topics within this guide were selected to meet the needs of utility personnel and contractors working on the inspection and maintenance of transmission line structures. The report includes a full-range approach that covers all relevant subjects, including corrosion inspection and corrosion risk mitigation methods specific to both above-ground and below-ground T&D structures.
RESEARCH REPORT
Impact of Climate Change and Adaptation to Climate Extremes in Overhead Line Design
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The frequency and severity of extreme weather events are increasing, partly due to climate change, yet transmission infrastructure standards continue to assume stationary climate conditions. This report reviews current science and practice for estimating future loads under both stationary and nonstationary conditions; develops methods and guidelines for projecting extreme wind and ice loads along with their uncertainties and impacts on design standards; and examines adaptive design frameworks for overhead transmission lines. The guidance will support utilities in cost-effectively designing and upgrading overhead lines while accounting for evolving climate risks with confidence.
GUIDANCE DOCUMENT
Optimal Placement of Anti-Cascading Structures in Overhead Line Design
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This report presents a systematic methodology for determining not only the containment loads on the surviving structure after a cascade, but also the optimum location of an anti-cascade structure that will be able to resist these loads after a cascade event. In addition, the report presents information on cascade and failure mode identification, current industry practices, and a review of various design standards and specific case studies on cascade failures. Finally, the report presents a literature review on various mitigation strategies that use anti-cascade devices to reduce the likelihood of a cascade.