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3306: Investigation of the Differences in the Application of the Canadian and U.S. Methodology for Estimates of Ice Loads for a 50-yr Return Period

A concern of utilities in the United States and Canada is the discontinuity in 50-yr return period ice loads between the Canadian CSA map and the map for the United States in the ASCE 7 Standard. The purpose of this study by the Cold Regions Research and Engineering Laboratory (CRREL) and Environment Canada (EC) is to investigate the differences at the common border. The study area extends from eastern Michigan and northwest Ohio, across Ontario, and into western New York. This report explains t
Jun 1, 2002

OTD

Research

33142: Evaluation of NDE of Wood Poles

The objective of this project is to prepare a state of the art report for evaluating in-service wood pole strength data based on non-destructive tests (NDE). The study should evaluate all NDE tools available in the market place and their effectiveness, in the use of in-service pole conditions particularly, validating field assessments and measurements by actual pole bending test data that are available in open literature or manufacturer’s own database. In addition, the study should address the a
Oct 23, 2020

OTD

Research

3146: Implementation of Dynamic Line Ratings

Sep 28, 2021

OTD

PSPO

Research

33117: Understanding Ground Anchoring Systems for Overhead Line Foundations

This guidance document presents a state-of-the-art report on “best practices” for designing ground anchoring systems for transmission line structures and is intended to provide transmission utilities a guide for the cost-effective design of ground anchorage systems to reduce the cost of foundations. The  study  approach  is  developed  from  a  review  of  the  literature  related  to  anchorage 
Aug 15, 2018 - Jan 19, 2022

OTD

Research

3325B: Extreme Ice Thicknesses and Concurrent Wind Speeds in Canada Along the U.S. Border

Weather data at Canadian weather stations along the contiguous U.S. border were used to improvethe U.S. map of 50‐year equivalent radial ice thicknesses from freezing rain. Freezing rain stormswere extracted from the merged weather and daily precipitation data, and ice thickness wasestimated for each storm using the CRREL and Simple ice accretion models. The more severe stormswere investigated in contemporaneous local newspapers to determine the severity and extent of iceand wind‐on‐ice storm da
Aug 1, 2006

OTD

Research

3398A: Best Practices Guide for Extra High Voltage AC Transmission Lines (230 kV - 765 kV) - Electrical Aspects of EHV Line Design

The scope of this project includes a critical review of available technical information and recent developments paired with the rationale for these best practices and finally, the development of this guide. To address both the electrical and mechanical issues effectively, the present study was conducted in two phases. This report addresses the first phase of the study and includes the electrical aspects of EHV AC line design. The second phase of this study will address the mechanical aspects of
Jan 2, 2015 - Feb 15, 2019

OTD

Research

33113: Understanding and Development of a Database for Line Failures

Infrequent failures of overhead transmission line (OHTL) facilities, particularly under extreme loading conditions, are inevitable if engineers are doing their jobs effectively as it’s impractical and unreasonable from the perspective of costs to design, construct and maintain facilities such that there is zero risk of failure. Therefore, failures will occur and when they do there is much to be learned.However, all too often information that could prove invaluable to improve design, procur
Jul 5, 2017 - Jul 19, 2018

OTD

Research

33103: Seismic Effects on Transmission Lines and its Major Components

Transmission lines and their major components are critical infrastructure for electrical power transmission and are used throughout the world. The state-of-the-practice for the design of transmission line structures is commonly governed by loading caused by wind/ice combinations and broken wire forces. However, earthquake effects are not commonly considered in transmission line structural design, even in high risk seismic areas. A survey conducted as part of this project shows that the majority
Jul 20, 2015 - May 15, 2017

OTD

Research

33127: Transmission Line Structures Under Downbursts and Tornadoes

Downbursts and tornadoes belong to a category of windstorm events often referred to as High-Intensity Wind (HIW). They represent a major hazard for transmission line (TL) structures as many failures occurred during HIW in various countries around the globe, including Canada.  As such, a vigorous research program related to this subject was conducted during the past fifteen years at the University of Western Ontario (UWO). In the first part of this report, a summary of the outcomes of this e
Oct 1, 2019 - Jan 19, 2022

OTD

Research

3363: LiDAR Analysis of Existing Transmission Lines: Survey of WISMIG Utility Practices

The use of LiDAR (Light Detection and Ranging) surveys is becoming more popular in the transmission line industry. A number of WISMIG utilities are using LiDAR surveys as an alternative to ground based surveys which are time consuming and hazardous at times. Some utilities use LiDAR for vegetation management while others use them for up-rating and asset management, etc. This benchmarking study was carried out to gather information on the practices of various WISMIG utilities, and the vendors us
Aug 1, 2009

OTD

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