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33122: Comparative Evaluations of Direct Embedment, Drilled Shafts and Steel Caisson Foundations for Tubular Steel Pole Structures

This report presents an evaluation of three foundation types for tubular steel pole transmission line structures: direct embedment, drilled shafts, and steel caisson foundations. The aim of this study is to provide engineers with a critical analysis methodology to aid in determining the most economical foundation type for different applications. This report delves into historical and contemporary methods for selecting and sizing foundations and examines their applicability across various soil ty

Dec 19, 2017 - Feb 4, 2025

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33149: Developing Tools for Galloping Control and Dynamic Load Assessment

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33114: Guidelines for Optical Ground Wire Technology

Overhead Optical Ground Wire, or OPGW, serves two (2) main systems – i) power delivery and ii) telecommunications – with the following functions: i) provide protection to overhead lines against lightning strikes and provide a return path to short circuit currents during system faults, and ii) provide a high capacity optical communications network. OPGW is considered an integral part of the power network system. The OPGW network must withstand various installation and in-service stres

Nov 13, 2017 - Jan 22, 2019

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Research

3316B/2: Spatial Factors for Extreme Ice and Extreme Wind: Task 2 Calculation of Spatial Factors from Ice and Wind Data

A concern of utilities is the spatial effect - the increase in risk from environmental loads of spatial structural systems (such as transmission lines) compared to point structures (such as a building or microwave tower at a particular location). The environmental loads are measured at relatively few locations (weather stations) while the spatial structural system is exposed to all the storm systems that intersect any portion of the system. In Canada, the CSA standard for overhead lines specifie

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33140: Best Practices on Geotechnical Site Investigations of Transmission Lines

Electric transmission lines (TLs) are a critical infrastructure used for transporting high-voltage electric power over long distances. Compared to other infrastructure projects, geotechnical site investigation and foundation design for transmission structures are very challenging due to their diversity and complexity associated with wide spatial variabilities of soil conditions along the TL routes, requiring time-consuming and cost-intensive investigative work. Proper guidelines addressing these

Feb 4, 2022 - May 28, 2024

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Research

3308: Inspection Techniques for Detecting Latent Damage to Existing Overhead Transmission Lines from Previous Ice and Wind Storms

A checklist template has been developed to facilitate the customized inspection of transmission line components for latent component damage after a severe ice and/or wind storm event has taken place.This report includes sufficient technical and illustrative details to permit a user to customize the checklist template for application on a specific transmission line section for any given storm severity level of the users’ choice. While the report suggests six typical storm severity levels (i

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3250: CPF: Historic Transmission Line Structure Design Practices Compared to Today’s Practices and Requirements

Some of the existing transmission lines in North America were built at the beginning of the twentieth century. As the structures deteriorate over time, it becomes necessary to replace some of the supporting structures, or, in some cases, the complete structure. Moreover, these structures were designed in accordance with the requirements of the standards at the time they were built, and over the intervening period, the requirements of the standards have changed significantly. This report reviews

Mar 15, 2013 - May 1, 2014

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3344: Modeling and Forecasting Icing Events Using Regular Weather Models

Ice accretion on electric power network equipment can cause severe damage to overhead conductors, supporting structures, and other components of electric power transmission systems. Every year, severe ice storms lead to prolonged power outages, with serious technical, economic and societal consequences. In view of these challenges, an enhanced ability to model and forecast icing events is highly desirable. It has the potential to significantly improve the reliability of high voltage transmission

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3326: Guide to Define Design Criteria for Outdoor Station Insulators Taking Into Account Pollution and Icing

The objective of this report is to realize a comprehensive literature survey related to insulator performance under ice and pollution conditions, especially in regards to station insulators. This will be used, along with contractor experience, to prepare a guide dealing with design criteria for outdoor station insulators under ice and pollution conditions. This report explains how to assess a location for the co-incidence of meteorological conditions (ice, snow or fog) and pre-existing conditi

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3256: CPF: Guide for Cathodic Protection of Transmission Line Structures

The primary purpose of this document is to provide practical information and guidance on the design, operation and maintenance of cathodic protection systems ― galvanic systems in particular ― for transmission and distribution (T&D) structures.Electrical transmission structures are composed of two distinct sections: the aboveground section that supports the overhead conductor, and the underground section (i.e., structure foundation) that supports the aboveground structures and the conductor. Bot

Aug 14, 2014 - May 24, 2016

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