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5135: Electrical Utility Guide for Uniform and Consistent Practices in Defining, Monitoring and Reporting Compliance with Steady-State Voltage Levels at Points of Common Coupling

A basic attribute defining the quality of supply voltage in utility systems is the steady-state voltage at the point of common coupling. Several widely used Standards exist, in North America and elsewhere, that are referenced by electrical utilities for defining steady-state voltage levels. However, the definitions incorporated in these standards are not always consistent, and the prescribed tolerances related to steady-state voltage levels may be ambiguous. In some instances, the definitions

Jan 1, 2009

Research

5152: Power Factor Correction Capacitor Software Tool

The project was undertaken to help utilities provide good information to their customers on power factor correction capacitor (PFC) applications. Many customers have deployed PFCs based on flawed or incomplete information, including analyses done only at peak load. In those cases, PFCs do not provide the expected cost and energy savings after deployment, and this disappointment may create a customer relations problem for the utility. Unexpected harmonic resonance problems have also been encounte

Aug 26, 2009 - Dec 1, 2011

Research

5160: Understanding, Avoiding and/or Mitigating Distribution Power Lines Electrical Noise Transfer to Communication Circuits

The increasing number of harmonic producing loads on the distribution system causes concerns for telephone interference with facilities that are installed in close proximity to the feeders. This project is intended to describe the mechanism of noise transfer and methodologies to limit excessive interference levels.The following items are discussed in the report: (1) noise sources, (2) coupling mechanism, (3) receptor circuit, (4) standards and interference limits, (5) measurements and (6) mitiga

Mar 23, 2012 - Feb 6, 2013

Research

7019: Power Quality Energy Efficiency Guide

Power quality has become the term used to describe a widerange of electrical power measurement and operational issues.Organizations have become concerned with the importanceof power quality because of potential safety, operational andeconomic impacts. Power quality is also a complex subject requiring specificterminology in order to properly describe situations andissues. Understanding and solving problems becomes possiblewith the correct information and interpretation.This Power Quality Referenc

Jun 12, 2006 - Aug 15, 2006

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Research

5142D: Harmonic Distortion Level Evolution at Residential PCC in North America, Phase IV

In 2000 [24] and 2008 [8], surveys were performed in Canada to measure the harmonics caused by domestic loads. Each survey was performed over one year in single week intervals for each location; together confirming observations made by Professor Alexander Emanuel in 1995 [3] which revealed that the growth rate of harmonics can be up to 0.35% per year.Although harmonic orders 9 and 15 were the only orders identified as being critical in the 2008 survey [8], the safety margin allowing for addition

May 5, 2016 - Apr 17, 2017

Research

5123: Power Quality Impact Assessment of Distributed Wind Generation

This report addresses the important aspects of distributed wind generation impacts on power quality. The results presented in this report provide distribution engineers with data necessary to effectively understand and evaluate the impact of wind turbine installations on distribution systems. This report discusses the various wind turbine technologies and how they can affect distribution system voltage regulation, flicker, harmonics, and protection coordination. Sensitivity analyses are also

Jun 1, 2005

Research

5176: Guide for Variable Frequency Drive Installations

This handbook provides the reader with information for the issues associated with the use of variable frequency drives (VFDs). The handbook also provides a description of the AC motor characteristics when operated at fixed speed from the utility line and when operated by a VFD. The many potential issues upstream and downstream of the VFD are discussed and mitigating solutions are provided. Since the electrical characteristics of the distribution system are different at every site, VFD issues wil

Aug 11, 2017 - Nov 7, 2018

Research

5134: Interharmonics: A Tutorial on Their Sources, Characteristics, Measurement and Mitigation

Interharmonics are spectral components whose frequencies are not integral multipliers of the supplyfundamental frequency. They can be produced by variable frequency drives, arc furnaces, andfluctuating loads. Interharmonics are more troublesome than harmonics. Firstly, the frequencies ofinterharmonics can vary with the operating conditions of the interharmonic‐producing loads, whichmakes them more difficult to mitigate. Secondly, interharmonics can cause flicker in addition todistorting the wave

Jul 1, 2007

Research

5143C: Power Quality Case Study Library

The objective of this project was to develop a practical application guide that provides a review of common power quality problems and solutions, and a library of representative power quality case studies. This report includes relevant standards-related information and representative measurement data and computer simulations for many of the common power quality problems that occur on the electric power system. This report presents the complex subject of power quality using easily understandable

Mar 1, 2010

Research

5142B: Harmonic Distortion Level Evolution at Residential PCC in North America

In 2000 and 2008, harmonic surveys were performed in Canada to measure harmonics caused by domestic loads. Each survey was performed over a single week at each location, and together they confirmed observations made by Professor Alexander Emanuel in 1995The duration of this project is planned for several years, but requires a minimum period of at least three years. If at all possible, each harmonic recorder will remain connected at the same location but some recorders may be relocated for variou

Apr 15, 2010 - Feb 10, 2015

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