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33112: Guidelines for Compact Line Design

Utility experience in the past few years has shown the possibility to eliminate the impact of transmission lines on the community by implementing techniques such as compact lines. The major motivation for the implementation of compact lines is that by using conductors that are spaced closer together and supported by smaller and more attractive structures, overhead transmission lines will be less visually intrusive and more likely to be accepted by the public.CEATI awarded project # T173700-33/11

Oct 15, 2016 - May 28, 2019

OTD

Research

3313: Review Various Options to Prevent Cascading Type Failures and Assess their Cost Effectiveness

Many transmission lines have experienced large-scale progressive collapses called cascades. This study investigates and reports on measures to prevent transmission line cascades and reduce the damage caused by cascades. The report includes a description of how cascades start and progress, reviews the literature for examples of historic cascades, examines those cascades to see what lessons can be learned. Additionally, the report reviews previous studies by the WISMIG concerning current design

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3360: Technology Watch for the Drag Coeeficient of Ice-Covered Conductors

The drag coefficient of ice-covered conductors and shield wires is difficult to prescribe in design standards and guidelines because of the wide variation in the shapes of ice accreted from freezing rain or supercooled clouds and fog. There is a factor-of-two variation (0.7 to 1.35) in published drag coefficients of bare conductors with the variation attributable to a) Reynolds number, b) wind tunnel used, and c) conductor stranding. For this project, the experimental literature on measured drag

OTD

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3377: Robotic Maintenance and Its Implications for Design

Electric power utilities are interested in investigating developing, robotic-based maintenance, inspection, upgrade, and construction technologies for transmission lines, particularly with regard to how the accommodation of these technologies and practices could impact the design of transmission lines. This study investigates and evaluates methods for robotic maintenance of transmission lines, specifically their impact on transmission line design practices, in that some changes might need to be

Feb 15, 2011 - Jan 26, 2012

OTD

Research

33109: Numerical Simulation of Transmission Line Vibration Caused by Ice Shedding

The structural design of overhead lines accounts for extreme climatological events, including wind and ice loads, properly combined to provide adequate reliability of components. Apart from direct climatological loads (transverse and vertical), the line is also exposed to longitudinal loads arising from differential ice loads. These arise from ice shedding, a phenomenon that occurs when ice sheds and creates unbalanced longitudinal loads on adjacent structures. This work presents reviews of lite

Nov 9, 2016 - Mar 10, 2020

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Research

3356: Ground Clearance Buffers for the Design and Analysis of Transmission Lines

Report is available to all members of TODEM Interest Group at:http://my.ceati.com/en/event/ground-clearance-buffers-for-the-design-and-analysis-of-transmission-lines/1536/In the design and/or analysis of overhead transmission lines, for minimum ground clearances, electric utilities follow the requirements of national safety codes (such as the NESC in the United States and the CSA in Canada) and any other appropriate state, regional or local regulatory requirements. Codes and regulatory requireme

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

The primary objective of this project is to review the current knowledge of “best practices” in designing EHV overhead lines. Primary focus here will be the mechanical aspects of line design. The information should be presented to TODEM members in a way that they can understand. It is also expected that the document will provide a quick reference guide so that a less experienced engineer can understand the issues and the technical content and follow the EHV line design process in a transparent m

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Research

33147: Assessment of Existing Foundation Capacity for Line Uprating/Upgrading

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Research

3390: Best Practices for Design of Transmission Line Structures Located in Water for Protection against Additional Loads Imposed During Floods and Foundation Scour

This report is a best practices guideline for the design of electric power transmission line structure foundations located in or near water. Effects of ground loss due to moving water, increased hydraulic or ice loads, water surface freezing, floating logs and debris and foundation soil liquefaction need to be addressed in design, in addition to structure imparted loads. A literature review, case history summary and industry survey were performed to characterize the conditions, the overall magni

Jun 1, 2013 - May 11, 2015

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Research

3388: Guide for Design, Installation and Repair of ACSR Conductor Splices

This report reviews the current information relating to the design, installation, failure mechanisms, inspection, and repair practices of ACSR conductor splices/connectors in the transmission system. The information was gathered through the literature review and a survey of industry practice.Few standards describe the design and inspection requirements for ACSR conductor splices. Most utilities follow guidelines from either the conductor manufacturer or connector manufacturer to design and insta

May 1, 2012 - May 26, 2014

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