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5143B-11: Harmonic Resonance Overview

ABSTRACT: Harmonic voltage distortion is a result of the voltage drop created across the equivalent power system impedance by harmonic currents from customer nonlinear loads. Once the characteristics of the harmonic sources have been identified, the response of the power system at each harmonic frequency must be determined to determine the effect of the nonlinear loads on the harmonic voltage distortion. Power system problems related to harmonics arise most frequently when the capacitance in the

PQ

Research

5172: Voltage Fluctuations Caused by Transient Clouds in Distribution Systems with a High Level of PV Installations

The penetration of photovoltaic (PV) generators into distribution systems is creating new power quality concerns for utility companies in the form of voltage fluctuations resulting from rapid PV output change. This change in PV output is, in turn, caused by transient clouds. Individual clouds can move rapidly across the sky, blocking and unblocking the solar irradiance received by a PV installation. The resulting change in PV generator output can be as high as 80% of its capacity, which can occu

Jul 7, 2015 - May 12, 2016

PQ

Research

3264: Formulating Health and Condition Indices for Transmission Lines

A road map and methodologies had been proposed for the development of health indices (HI) for transmission lines. Unlike the traditional HI formulas that are pre-set and fixed once developed, the HI formula presented in this study provided the flexibility of adapting to future changes in data inputs and maintenance strategies.The proposed HI formulas are utility specific and are dependent on actual information provided by a utility. As the condition parameter weights were calculated instead of b

Jun 26, 2015 - Oct 15, 2018

OTE

Research

33105: CPF: Integrity Testing of Concrete Drilled Shaft Foundations

For achieving drilled shaft integrity, post-construction testing by cost effective Non-Destructive Testing (NDT) methods are routinely used in the Transportation Industry. The objective of this project is to review the applicability of NDT methods to test drilled shafts for Transmission Lines to provide concrete characterization of drilled shafts defects and develop guidelines for accepting or rejecting anomalous drilled shafts. This report is based on an extensive literature review, including F

Oct 5, 2015 - Jun 13, 2019

OTD

Research

0440: In-Person Seasonal Volume Forecasting Training

HOP

Research

0228: Seismic Hazard and Risk Workshop for Dams

This report presents a summary and conclusions of a workshop that focused on issues related to seismic hazard and risk for hydropower projects. The workshop brought together participants from a number of Dam Safety Interest Group members, their consultants, experts in seismic hazard analysis, geotechnical engineering, and risk analysis. The workshop covered a wide range of topics: seismic hazard analysis, site characterization, seismic performance assessment, dam safety seismic modificati

Mar 20, 2012 - Dec 1, 2012

DSIG

Research

3369: Guide to Reconductoring and Uprating Transmission Lines

Uprating existing transmission lines to increase power delivery can be an attractive alternative to new construction. This guide presents a methodology for uprating, reconductoring and condition assessment practices used, as well as documents utility experiences with the different methods. New devices, new types of conductors and new methodologies for uprating transmission lines are presented. The information for this guide is derived from a literature review, utility experiences and indus

Sep 1, 2010 - Sep 30, 2012

OTD

Research

3810: Business Transformation for Data Management in Modern Grid Operations

To operate modern distribution systems, utility operating systems and technologies depend on multiple robust datasets. The data can be sourced from field devices, station devices, enterprise IT systems, customer information systems, asset databases, geographic information systems (GIS), metering systems, and manual data collection processes. To effectively modernize grid operations, utilities continue to implement new technologies and systems. They also need to provide the necessary ongoing supp

Mar 28, 2022 - Aug 19, 2024

ADO

DOA

Research

3411-1: Transmission Underground Cable Reference Manual - Chapter 1: Maintenance

The information used in the preparation of this Manual already existed in various formats within the member utilities. Individual utilities had generally organized their practices in an ad hoc manner, corresponding to their own specific system needs. Since transmission cable systems have always been custom engineered to meet the specific utility requirements, there are a considerable number of variations in the procedures followed by the individual utilities. CEATI’s Transmission Undergrou

Aug 1, 2010 - Dec 31, 2013

TUC

Research

33106: Performance and Control of Vibrations of HTLS Conductors

Part AThe industry’s standard practice utilizes the Energy Balance Method (EBM) to evaluate the homogeneous conductor vibration and does not consider the tension loads shared between the aluminum and core for multi-layered bi-metallic and bi-material conductors at different operating temperatures. This assumption has been proved, to some extent, adequate to predict the mechanical (vibration) performance of the common (AAAC, ACSR) conductors with the error becoming more prominent as the mat

Jan 7, 2016 - May 8, 2019

OTD

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