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3355: Technology Watch for Gaps in Knowledge About Conductor Fatigue

Transmission lines are engineering systems. Their design and maintenance require expertise in several aspects of engineering, in particular electrical, civil and mechanical. It is common practice though, in engineering, to separate problems into smaller ones and to try to find practical solutions to some particular aspects in order to achieve a safer and more economical product.The problem under study, aeolian vibrations and fatigue of conductors, presents a good example of such an approach. The

Jul 1, 2009

OTD

Research

33136: Line Ampacity Using Seasonal Weather Data

Demand for electricity is growing worldwide, yet the appetite to build more power lines is not increasing proportionally. Building new overhead lines (OHL) is expensive, so transmission owners are searching for new ways to transfer higher levels of power without building significant additional infrastructure.To avoid damage, the line rating is set so the ampacity does not cause a conductor to exceed maximum safe temperatures or breach clearance limits. The rating depends on the properties of the

Aug 16, 2021 - Apr 5, 2024

OTD

Research

4105: An Analysis of PhoDAR vs. LiDAR for Collecting Spatial Data by Electrical Utilities and Operational Recommendations for Use

Advancements and innovations in mapping technologies provide electrical utility operators with timely and multidimensional spatial data to meet compliance requirements, situational awareness, and predictive modeling in support of vegetation management and asset monitoring. Photogrammetry techniques commonly referred to as PhoDAR or Structure from Motion (SfM), and LiDAR are common 3D digital mapping techniques that are continually advancing and thus gaining popularity for use in the market. Furt

Feb 1, 2019 - Mar 30, 2023

OTD

Research

33120: Galloping Mitigation – Performance Evaluation of Various Anti-Galloping Control Devices

Galloping is an extremely destructive type of wind-induced conductor motion. For overhead lines, typical galloping mitigation techniques include the use of various in-span mechanical anti-galloping devices that utilize different mechanisms to mitigate galloping motion or reduce some impacts on the line caused by galloping. Field experiences have indicated that the performance of different anti-galloping devices varies significantly. To obtain better confidence regarding the performance of these

Sep 26, 2018 - Aug 25, 2021

OTD

Research

33130: Life Cycle Cost Evaluation of Transmission Lines

In order to stay competitive, electric utilities are required to invest in the upgrade and expansion of their infrastructures to provide services to an increasing customer base. Since these projects require significant investments, utilities are increasingly interested in accurately identifying the initial construction cost and maintenance costs to determine the lowest life cycle cost and the total cost of ownership. This report presents an integrated model that consistently determines the life

Feb 28, 2020 - Sep 18, 2021

OTD

Research

3321A: The Galloping Phenomenon - Occurring Problems and Solutions: PSE&G Data

This report attempts to reproduce galloping events through simulation (based on examples of galloping at an actual facility), to reproduce the loads on towers during galloping and to compare galloping prevention effects with different countermeasures. 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 element method.Keywords:Galloping, simulation, countermeasures, transmis

Jul 1, 2005

OTD

Research

33138: White Paper on Resiliency

The significant disruptions to power systems in recent extreme events make it timely to investigate what resiliency against such events really means, what is the value of resiliency, and what would be required to ensure that an adequate level of resiliency is provided – including, from the important perspective of transmission line systems. As such, this White Paper first presents a widely accepted and adopted definition of power system resiliency for the electricity sector and transmission line

Nov 26, 2021 - Feb 28, 2023

OTD

Research

3364: Conductor Fatigue Work for ARMOR-GRIP® Suspension Clamps

This test program was initiated to determine the comparative Aeolian vibration fatigue performance of a conductor installed in an ARMOR-GRIP Suspension (AGS) clamp versus a bolted suspension clamp. To establish the fatigue performance of the AGS compared to a bolted suspension clamp, the conductor/clamp system was tested at one dynamic level. The antinode loop velocity was used as the control for the first test. To completely define the fatigue endurance characteristics between the two clamp sys

Jun 1, 2011

OTD

Research

3382: Estimation of Safe Design Tension for TW (Compact) ACSR Conductors to Safeguard against Aeolian Vibrations

One of the objectives of this project is to investigate and develop recommendations for safe design tension of single, undamped, trapezoidal-wire (compact) ACSR conductors with respect to Aeolian vibrations. It is done by means of a mathematical model fed with specific empirical data regarding trap-wire conductor self-damping and fatigue endurance characteristics. The possibility to extend those recommendations to twisted-pair (T2 or VR) conductors is explored in the report. Another objective is

Apr 1, 2011 - Mar 12, 2012

OTD

Research

3391: Guide for Fire Protection of Transmission Lines

High voltage transmission lines traverse a wide variety of terrain and environments. Many are exposed to some degree of wildfire risk, which can adversely affect various transmission line components and, ultimately, system reliability. Wildfires can affect transmission components in different ways. Intense heat, flame impingement and soot deposition have the potential to ignite or damage support structures, hardware and insulators. Smoke and flame induced line faults similarly degrade overall sy

Jul 3, 2013 - Nov 9, 2015

OTD

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