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33131: Development of Fragility Models for Key Line Components

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33101: State of the Art report on Designing Transmission Lines for Wet Snow Accumulation

Wet snow occurs in any region of the world where snow falls at ambient temperatures of around 0ºC. Wet snow may be sticky and easily adhere to exposed objects, such as electric transmission lines. Significant loading on transmission lines may result from wet snow accumulation, especially on conductors and ground wires; therefore, transmission lines must be designed to withstand such loads.It has been identified that wet snow accumulation is not sufficiently addressed in the current transmis

Sep 1, 2015 - Jul 30, 2017

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Research

33129: Self-Damping Measurements and Assessment of HTLS Conductors

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Research

3367: Methods for Conducting Extreme Event Model Simulations

This report, along with attached software, provides a methodology to examine the reliability of high-voltage transmission lines due to extreme wind and ice loads. The inventory, hazards, fragility and models are organized to allow the end user to perform rapid (Level 1) and modestly detailed (Level 2) reliability analyses. The models allow the user to examine the reliability of existing transmission circuits that have been damaged in actual storms and to establish the probable ca

Mar 3, 2010 - Aug 1, 2012

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Research

3350: Guide to Best Practices for the Design of 115-230 kV Overhead Transmission Lines

This Guide presents information on the design of 115 kV to 230 kV overhead transmission lines. It presents the elements of 115 kV to 230 kV lines, including materials, configurations, insulation, reliability, EMF, and economics. The objectives of this Guide are to provide a discussion of the factors that must be taken into account in the design of transmission lines and to provide best design practices.The Guide also includes some other (non-design-related) aspects of transmission lines, such as

Sep 1, 2008 - Oct 11, 2011

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Research

3399B: State of the Art Report on Design Practices for Long Span/Tall Transmission Tower Systems

This report provides information to the overhead transmission line design community regarding current state-of-the-art practices employed to design long span/tall tower transmission systems. It includes a review of articles and publications relevant to long span/tall tower systems, a summary of survey results of systems already in service, and a critical review of codes and standards from the standpoint of conventional versus advanced analysis methods. The report offers a discussion of conventio

Jan 15, 2018 - Aug 15, 2019

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Research

3319A: ADINA Modeling Guide and Benchmark Tests For Component Failure Analysis in Overhead Line Sections

Transient dynamic analysis of overhead line sections subjected to component failures has beenshown to be both feasible and reasonably accurate using the commercial software ADINA. Althoughseveral modeling tips are available in the open literature, the level of detail is insufficient forinexperienced ADINA users, and does not allow them to produce working models within areasonable timeframe.This modeling guide will facilitate the use of rational dynamic analysis of line sections under typicalcomp

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3375: Emergency Restoration Methods Under Extreme Events - Best Practices

No one is immune to the powerful and disastrous effects of nature’s forces unleashed. While natural forces, such as storms (thunder storms, ice storms, fire storms and dust storms), hurricane force gusts (including tornadoes), landslides (avalanches and mudslides), earthquakes and floods are destructive, human forces (vandalism and terrorism) often add to an already long list of threats to the energy infrastructure. More specifically, transmission and distribution electric power grids are,

Mar 14, 2011 - Feb 4, 2013

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Research

3321B: The Galloping Phenomenon - Occurring Problems and Solutions: NU Data

This report attempts to reproduce galloping events through simulation (based on examples of galloping at an actual facility), to determine the loads on towers during galloping and to compare the performance of existing galloping mitigation solutions or countermeasures (phase to phase spacers, detuning pendulums and spiral rods). This simulation study used the ""CAFSS"" analysis code, which is a non-linear analysis program for cables and three-dimensional framework structures using the finite el

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3317C: Evaluation of Live Line Conductor Vibration Recorders, Part II: Laboratory Span Tests

Aeolian vibration of overhead transmission conductors can lead to fatigue damage. The fatigue damage is evident by broken strands at the suspension clamp of the conductor. Field vibration recorders are used to indicate the stresses that result in fatigue damage by measuring the bending amplitude at the conductor’s suspension clamp. The bending amplitude is relatively small, in the range of 0.25mm (0.01 inch). The task of the vibration recorder is to measure these small amplitudes in a very

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