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3398B-8: Construction: Issues and Challenges

OTD

Research

3338: Safety Measures During Emergency Restoration

This report provides recommendations for the safety of utility emergency restoration workers, other emergency responders and the public during the restoration of power due to emergency situations.The intent is to assist the sponsoring utilities in developing proper safety procedures for their emergency response personnel and the public during catastrophic situations to minimize injuries or deaths due to accidents.Keywords: Emergency, catastrophic events, safety, emergency restoration, restoratio

OTD

Research

3319B: Additional Load Control Devices (LCDs) for Overhead Lines

In an earlier report (CEATI Report No. T003700-3304 Load Control Devices (LCDs) for Overhead Lines, Phase 1) prepared for the Wind and Ice Storm Mitigation Interest Group (WISMIG), 25 different load control devices were described and classified as either force limiting devices, force reduction devices, structure based force control methods, or load removal devices or methods. Since that report was completed, references to many new devices have been found. This report supplements CEATI Report N

OTD

Research

3312B: Cost Benefit Analysis for Overhead Lines by Comparing Two Design Alternatives (Overhead Groundwires versus Surge Arresters)

Transmission line surge arresters (TLSA) are a commercially viable alternative to the use of overhead groundwire protection (OHGW). Bias against the use of OHGW is particularly strong among structural engineers in areas of high icing and low lightning flash density. Existing practice and performance of unshielded lines is reviewed using the context of local lightning, icing and grounding problems. A method for comparing the lightning performance of lines with a single OHGW against the use of

OTD

Research

3380: Determination of the Drag Coefficient (Cd) for Bare and Ice-Covered Transmission Conductors

The objective of this study was to evaluate the feasibility of using computational methods to determine the drag coefficient of bare and ice covered conductors. The drag coefficient on bare and idealized ice-covered stranded single and twisted-pair conductor sections was determined using direct wind tunnel measurements and computational fluid dynamics (CFD) simulations for Reynolds numbers ranging between 104 and 105. The drag coefficient measurements were made in the CRREL Environmental Wind Tu

Jul 1, 2011 - Oct 11, 2013

OTD

Research

Resiliency Resources Inventory

This Resiliency Resources Inventory is a compilation of resources across a sub-set of CEATI's transmission and distribution groups focused on enhancing the reliability and resilience of T&D systems. The inventory identifies ongoing and completed projects, as well as completed webinars, workshops and information exchanges showcasing innovations and best practices across multiple facets of power system resiliency. The inventory identifies resources on infrastructure hardening, grid moderniza

Research

33145: Application of Digital Twin Technologies To OHL Design and Maintenance

The primary objective of this study is to discuss the importance of Digital Twins for electric utilities and provide our members the best available information on the impact of digital twin technologies on the performance and operations of existing and future power transmission grids. A framework for developing and transforming current design and operation practices that includes the application of Digital Twins for electric utilities should be presented with some case studies and examples based

OTD

Research

33126: Selection Criteria of Backfill Materials and its Impact on Assessing Foundation Capacity

This report provides a state-of-the-practice assessment of commonly used and alternative backfill materials for the design and construction of direct embedment poles installed in drilled holes (shafts), grillages, and pad and chimney foundations for the electric transmission industry. The challenge associated with backfill materials derives from the need to achieve a specified in place density so that a foundation functions as designed. In addition to the confined spaces where backfills must typ

Nov 9, 2018 - Feb 14, 2024

OTD

Research

3316B: Spatial Factors for Extreme Ice and Extreme Wind: Task 1 Literature Review on the Determination of Spatial Factors

A concern of utilities is the spatial effect, which is the increase in risk of large structures, such as transmission lines, to environmental loads compared to point structures. The CSA standard for overhead lines specifies a spatial factor of 1.5 be applied to the mapped 50-year point ice thicknesses. In the United States, the spatial effect is discussed in ASCE standards and guidelines, but no spatial factor is specified. This report is a review of the literature on the spatial effect for both

OTD

Research

33121: Operating Limit for Conductor Temperature and its Impact on Splices

This report summarizes key information gleaned from technical literature and utility survey responses regarding the use of HTLS conductor systems (conductors and connectors) in uprating existing lines and in designing and constructing new overhead transmission lines.According to the most recent CIGRE technical brochures on HTLS conductors [1], [2], ACSR is traditionally grouped with AAC, ACAR, and AAAC as conductors expected to be operated at low temperatures not exceeding 95 Celsius for ex

Sep 1, 2018 - Feb 5, 2021

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