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3336: Strength of Steel Angles Subjected to Short Duration Axial Load

This report presents the results of a test program to determine the compression strength of single angle members subjected to short duration axial load, also referred to as Rapid Load. Lattice steel transmission towers are largely constructed of single angle members. When a conductor breaks, the load on the tower is of large magnitude but short duration. This research attempts to answer two questions: 1) do angles in transmission towers have a higher compressive strength under short duration axi

Jan 1, 2009

OTD

Research

3327: Real-Time Monitoring Of Energized Overhead Transmission Lines For Thermal Rating, Clearance Measurement And Climatic Data (Temperature, Wind And Ice)

This report reviews the current state of the art for real‐time monitoring of overhead transmissionlines for both thermal ratings and the measurement of ice and wind loads. The results of aquestionnaire on the experience of nine utilities with real‐time systems are tabulated and discussed.This includes experience with most currently available commercial systems and some customsystems. The advantages and disadvantages of each system are explained. Instruments suitable formeasuring wind speed, wind

Nov 1, 2006

OTD

Research

3359: Simulation of the Cascade Process of Towers

This document provides a synthesis of investigations made on the cascading tower process. It aims at estimating the loads generated by a tower failure on the adjacent towers for several cases of initial default on the line: failure of a tower, conductor breakage, etc. The main results are as follows.Concerning transversal failure:The critical point is the load transmitted by the ground wires. Conductors transmit lower loadings because of the insulator strings.It is very important to take into ac

Aug 1, 2009

OTD

Research

3325A: Updating the Wind and Ice Loads Design Information Used for Reliability Based Design

Within this report, reference 50-year return period wind speeds and ice thickness values for Canadaare updated for the Canadian Standards Association reliability-based design standard for electricaltransmission lines. Relationships to estimate other return period values, and, in particular, factors toestimate 150-year and 500-year return period values are also provided to support the reliability-baseddesign methods in the standard. This update represents the first comprehensive national update o

Sep 1, 2009

OTD

Research

33132: Mitigation of Line Deterioration

The economic, reliability, and safety consequences of transmission line failure can be immense. Degradation of overhead transmission line components affects their electrical and/or mechanical performance over time and can ultimately cause component or line failure in service. The ability to respond to and manage these risks requires an understanding of the degradation mechanisms affecting transmission line components. Effective asset management also demands planning for the identification, evalu

Nov 9, 2018 - Apr 27, 2023

OTD

Research

3353: Methodology for Transmission Line Failure Investigations

Electrical utilities, all over the world, face transmission line failures caused by natural climatic or other manmade causes. Utilities can not prevent these random events nor can they afford to design transmission lines that would not experience failures. However, by conducting a thorough investigation after a failure event, to understand and establish the cause of failure in the transmission system, utilities can make improvements to minimize the likelihood of future failures. This report prov

Mar 1, 2009

OTD

Research

3396B: Corrosion Manual on Steel Towers and Grillage Foundations

While structural material degradation due to corrosion is inevitable in aging electric utility structures, it is crucial to identify corrosion-related issues and select and apply proper corrosion mitigation methods before corrosion damage compromises the structural integrity of the assets. Considering the increasing competition within the energy market, corrosion management ― among other asset maintenance efforts ― has emerged as a major financial challenge for electric utilities that own and ma

Feb 15, 2018 - Jun 23, 2022

OTD

OTE

Research

3398B-3: The Challenge in Route Selection, Siting Process & Environmental Issues

CEATI requested WSP prepare this document as part of the Transmission Overhead Design and Extreme Event Mitigation Program (TODEM) “Best Practices Guide for Extra High Voltage AC Transmission Lines (230 kV - 765 kV) - Mechanical Aspects of EHV Line Design”. This document covers 3398B Section 3 - Phase 1: “The Challenge in Route Selection, Siting Process & Environmental Issues”.CEATI’s membership is drawn from around the globe and many regulatory jurisdictions. Recognizing there is a range of

Nov 15, 2019 - Sep 18, 2021

OTD

Research

3376: Standardized Guidelines for LiDAR Survey of Transmission Lines

This report provides an update on the use of the LiDAR survey for utility transmission line purposes. Included is a summary of the technology, survey methods, data processing, benefits, and caveats of the use of spatial data collected via LiDAR methods. A guide for the development of a supply specification, as well as a sample template, is also included. Utilities were contacted and requested to respond to a questionnaire on their use of LiDAR data. LiDAR suppliers were also contacted and respo

Sep 1, 2010 - Jan 26, 2012

OTD

Research

3339: Benchmark Study for a Line Modeled in ADINA (Stick Model) with Various Anti-Cascading Structures

The objectives of this project were to (1) assess the peak dynamic and residual static loads on the supporting structure in a transmission line due to a conductor’s rupture; (2) study the effect of flexibility of supporting structures in the transmission line on maximum dynamic impact and residual conductor loads; and (3) carry out a sensitivity study of various parameters, such as conductor tension, ice load, insulator string length, and type of terrain, on the peak dynamic and residual s

Jan 1, 2008 - Dec 31, 2012

OTD

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