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3387: Transmission Line Monitoring Package for Extreme Events

Continuous monitoring of overhead transmission lines has expanded from measures of terminal electrical properties (voltages, currents) to include mechanical and environmental measures along the line. The new, so-called Smart Grid data, can allow early identification of imminent dangers with sufficient lead time to take the appropriate remedial actions. The most frequent extreme event faced by typical power lines is a combination of low wind speed and high ambient temperature, correlated with pea

Jun 25, 2012 - Jun 1, 2014

OTD

Research

3373: Technology Watch on High Temperature, Low Sag Conductors for Transmission Lines

High Temperature Low Sag (HTLS) conductors present one of the most practical and economical solutions that have been considered by utilities to increase the power transfer capacity of transmission lines. This project was undertaken to provide details on various new HTLS conductors including ACSS, metal composite core conductor (such as ACCR), organic composite core conductors (including ACCC, HVCRC, Lo-Sag), gap-type conductors (including GTACSR, GZTACSR), and invar reinforced core conductors (e

Oct 1, 2010 - May 15, 2013

OTD

Research

2025: OTD Project Listings and Matrix

This document summarizes all projects completed within the Overhead Transmission Design group. The document includes topics and focus areas of the group with the corresponding project number of completed projects with the topics. To access the projects listed, members can search for the project number(s) on the CEATI member portal and access all relevant project documents, tools and presentations

Jan 1, 2025 - Jul 31, 2025

OTD

Research

3307: High-Frequency De-Icing of Power Transmission Lines Phase I

Icing of power transmission lines during winter storms is a persistent problem, causing outages and costing millions of dollars in repair expenses. Excitation at approximately 8 kHz to 200 kHz can be used melt ice off of power transmission lines while the lines remain in service. The ice is melted by a combination of dielectric losses in the ice and skin-effect losses in the conductor. This report analyzes the heating effects and develops recommendations for specific excitation patterns for de

Nov 1, 2003

OTD

Research

3398B-7: Understanding Vibration Issues in EHV Line Design and Mitigations

This chapter of "Best Practices Guide for Extra High Voltage AC Transmission Lines (230 kV - 765 kV) - Mechanical Aspects of EHV Line Design" is a best practice guide for utility engineers which covers the mechanisms, problems and solutions concerning conductor vibrations.Stand-alone sections are devoted to the different phenomena, beginning with an introduction covering wind characteristics and the basics such as wave propagation velocity, conductor stiffness, resonant frequency, mode shape, lo

May 14, 2020 - Aug 15, 2024

OTD

Research

3389: Application Guide for Wind Speed-Up Factors

Changes in the local topography affect the local wind speed which, in turn, influences wind loading on structures. The significance of the local topography on wind loads has been investigated by several researchers since the 1970s. Following these studies, several national wind loading standards and codes of practice such as NBCC 2005; ASCE/SEI 7-10, AS/NZS 1170.2:2002; EN 1991-1-4:2005 provide simplified guidance in the form of speed-up factors for generic topographic shapes, including isolated

Jun 1, 2012 - Dec 19, 2014

OTD

Research

33139: Design Implications for Lattice Towers and Pole Structures regarding Foundation Serviceability Limits

The objective of this project is to prepare a state of the art report on the assessment of serviceability limit criteria for various foundation types and compile this information in the form of best practices. The variability of tolerable displacements/rotations of foundations and its impact on design of structures (towers, poles) should be considered and studied. A guideline should be provided for each foundation type what is acceptable serviceability limits (displacements, rotations, different

Jan 18, 2022

OTD

Research

3385: Guide for Determining Deflection Criteria for Steel Poles and Drilled Shaft Foundations

Transmission line support structures can be quite flexible and may undergo large deflections under various climatic and other loading conditions. Large deflections of these structures can have a significant impact on the transmission line system. These deflections can affect wire clearances, as well as the stringing and sagging of the conductors, and can cause secondary moments on structural members, as well as significant appearance problems.The objective of this project is to evaluate the impa

Apr 1, 2012 - Jul 4, 2013

OTD

Research

3398B-4: Line/Structure Configuration - Its Impact on Line Design

The purpose of this section of "Best Practices Guide for Extra High Voltage AC Transmission Lines (230 kV - 765 kV) - Mechanical Aspects of EHV Line Design" is to inform a non-electrical engineer of all aspects relating to line design as well as the interplay between the electrical, civil, and mechanical aspects of line design. This includes the types of transmission line structures, tower top configurations, bundle configurations, etc. Examples are given as to the types of line structures, cond

May 14, 2020 - Mar 4, 2024

OTD

Research

T386: Field Trials of Galloping Control Devices for Bundled Conductor Lines

The main objective of this project is to evaluate the performance of promising add-on devices to control galloping due to ice and wind on bundle conductor transmission lines. To accomplish this objective, a survey of Canadian electrical utilities was conducted during 1984 to determine the extent and severity of bundle line galloping across Canada. Based on the results of this survey, field test sites on 2,3 and 4 conductor bundle lines were selected from most of the provinces. Two types of gallo

Nov 1, 1983 - Dec 1, 1992

OTD

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