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5108: Techniques to Assess Harmonic Distortions for Systems with Distributed Harmonic Sources

Harmonic distortions are traditionally caused by a few large centralized nonlinear loads. In recent years, the widespread use of variable frequency drives and similar devices has changed this situation. Systems with a large number of distributed harmonic sources are becoming a concern for utilities. Unfortunately, there are no methods available to predict the harmonic distortion levels in such systems. Traditional harmonic analysis techniques and associated commercial software packages are inade

Mar 1, 2004

Research

5143B-06: Capacitor Bank Restrike Case Study

ABSTRACT: Capacitor bank switch restrike events often produce high transient voltage surges that result in severe energy duties for adjacent arresters or damage unprotected equipment. Therefore, it is desirable to select a switching device that will minimize the possibility of a restrike. In addition, it is advisable to protect adjacent equipment with appropriately rated arresters. A capacitor bank switching device de-energizes the bank at a current of zero. Since the current is capacitive, the

Mar 1, 2010

Research

5180: Frequency Response of Instrument Transformers and Related Systems for Power Quality Applications

In this project, a review is conducted on different types of instrument transformers in terms of operation principles, installation, technical characteristics, and application. Comparisons among these instrument transformers are made to highlight their relative advantages and disadvantages.Detailed descriptions are provided on traditional inductive, electronic, and modern optical structures with respect to design; permanent vs. portable types with respect to installation; and metering vs. protec

Nov 25, 2019 - Aug 26, 2020

Research

5141: Impact of Utility Voltage Variations on Customer Systems: An Application Guide

The objective this project was to develop an application guide which provides a review of voltage variation phenomena that can negatively affect utility and customer power systems. The guide includes relevant standards-related information and representative waveforms for many of the common voltage variations that occur on the electric power system, including voltage sags during transmission and distribution system faults, momentary interruptions during circuit reclosing, undervoltages during in

Jan 1, 2009

Research

5143B-15: ASD Nuisance Tripping Case Study

ABSTRACT: Power quality problems related to utility capacitor bank switching include customer equipment damage or failure, nuisance tripping of adjustable-speed drives or other process equipment, transient voltage surge suppressor failure, and computer network problems. This case highlights several of the more common power quality problems associated with the application of utility distribution system capacitor banks. The frequent switching of capacitor banks, coupled with the increasing ap

Mar 1, 2010

Research

5113: Sag, Swell and Short Interruption Evaluation from the Canada PQ Survey 2000

This report explains the methodology of swells, sags and short interruptions phase and temporal aggregations and gives the results obtained after applying these two methods to data from “Canadian Distribution Power Quality Survey 2000”

Jan 1, 2003

Research

5146B: Power Quality Impact of Mass Penetration of Energy Efficient and Consumer Electronic Devices, Phase 2

The mass penetration of both energy efficient and consumer electronic devices in homes are resulting in noticeable distortions to the voltage and current waveforms in power distribution systems. This project investigates the potential impact of such home appliances, i.e. modernresidential loads, on the power quality of both secondary and primary distribution systems. Impacts such as harmonic voltage and current distortions, transformer loading, neutral voltage and current rise, telephone interfe

Mar 25, 2010 - Apr 1, 2012

Research

5151: Development of a Flicker Evaluation Program

AUSketcher is a flicker simulation/prediction software application designed to utilize readily-available input data to predict short-term flicker severity (Pst) values that could be present anywhere in the system modeled. The user builds a positive sequence model of a power system and provides information about fluctuating loads that are in the system. Using this information, the software calculates fluctuating voltages at each bus in the system model and, using these fluctuating voltages, calcu

Sep 7, 2009 - Apr 1, 2013

Research

5143B-02: Overview of Voltage Variations

ABSTRACT: Voltage sags and momentary interruptions are often the most important power quality problem for customers. These conditions are characterized by short duration changes in the rms voltage magnitude supplied to the customer. The impact on the customer depends on the voltage magnitude during the disturbance, the duration of the disturbance, and the sensitivity of the customer’s equipment. Voltage sags and momentary interruptions are inevitable on the electric power system. The most

Mar 1, 2010

Research

50121: Bonding of Telecommunications Sheath/Messenger to the Power Neutral

A telecommunication line parallel to an overhead or underground power distribution line is subject to electromagnetic induction from the power system under both normal loading and fault conditions. In order to minimize the possible hazards and damage caused by the electromagnetic coupling from the power system, bonding of an overhead telecommunication messenger or underground communication cable sheath to the electric utility’s neutral is common practice.This project studied the electromag

Apr 8, 2014 - May 25, 2016

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