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Research

D488: Voltage Unbalance on Distribution System Phase I

The aim of this report was to define the typical amount of voltage unbalance experienced on power distribution systems across the country. The first step was to determine the technical approach to unbalanced evaluation and calculation. The second step was to contact 31 utilities by way of a survey designed to construct a voltage unbalance database. Some 50 million voltage measurements were then recorded at six test sites across the country and processed to assess the typical voltage unbalance fo

Feb 1, 1989

Research

D711B: Performance of Power Line Monitors

The objective of this project was to gain a better understanding of the capabilities and limitations of power line monitors currently used by utilities. It is not intended as a guide for making purchase decisions on the latest available equipment. Areas of specific interest include ranges of performance, the validity of comparing results from different units, the methods used by selected monitors and resulting implications on accuracy of information, performance when the measurements fall outsid

Apr 1, 1993

Research

U856: Power Quality Labels for Sensitive Electronic Equipment to Withstand Voltage Surges, Sags and Swells from the Utility System or Customer Sites

This report details the development of a position paper on the creation and implementation of a power quality classification/labelling system. This system is intended to facilitate the matching of the level of AC voltage waveform aberrations at a given point of connection of end-use equipment (a "site") with the equipment's immunity to those aberrations. Power quality mitigation equipment is included in this system to enhance end-use equipment immunity or site power quality.The report presents a

Mar 28, 1994

Research

5102: Impact of the Introduction of the Electromagnetic Compatibility (EMC) Concept in The North American Electric Industry

The objective of this project was to determine the similarities and differences between the existing North American and IEC standards and the likely impact on suppliers and users of electricity.The project was carried out as a series of tasks. These examined the use of IEC standards in the electricity supply industry in Europe, the cost and benefits to suppliers and users, the effects of deregulation of the supply industry in Europe, comparisons of use of standards, cost and benefits between Eur

Feb 1, 1999

Research

U131: Customer Damage Resulting from Electric Service Interruptions

This project is an investigation of the direct short-term costs or losses incurred by electric utility customers as a result of local random supply interruptions. The major objective of the project is the identification of load-group categories. Additional objectives are to study the variation of cost with interruption and load characteristics and with history and expectation of reliability. The results of this investigation are compared with results of previous work, and the availability of int

Apr 1, 1982

Research

5101: 1998 Survey of Options and Devices Available for the Prevention, Correction and Mitigation of Electric Power Quality Disturbances

The proliferation of disturbance sensitive loads has made power quality one of the major concerns for utility companies and customers. Many innovative devices for disturbance mitigation have been developed and field-tested. As a result, a wide variety of options are now available for utility companies to improve the quality of their power supply.This report documents the results of a survey on the various solutions available for the prevention, correction and mitigation of power quality disturba

Aug 10, 1998

Research

D441: Power System Harmonic Measurement

Waveform distortion exists in power systems as a result of the generation of harmonics by common non-linear electrical equipment connected to the system. Waveform distortion occurs at all voltage levels and appears as harmonic currents and voltages. The harmonics can degrade or damage electrical equipment and interfere with nearby telephones.Proper control of the effects of harmonics requires a basic understanding of the problem and the tools for predictive analysis and verification through meas

Dec 1, 1984 - Dec 1, 1985

Research

D874: Propagation Characteristics of Power Quality Disturbances

This report deals with the propagation characteristics of power line disturbances, used to describe the disturbance severity at locations situated farther from the origin of a disturbance. The nature of the disturbance at the source, the power line parameters and the grounding system adopted are some of the factors that contribute to the characteristics of propagation. An in-depth analysis of this complex issue and evaluation of these characteristics are the major topics tackled by this project.

Dec 31, 1987

Research

D610: Optimum Metering System for Loads with High Harmonic Distortion

The objective of this project was to identify optimum metering systems for loads with high harmonic distortions. Field measurements of distortion waveforms were recorded at sites on the Nova Scotia Power Corporation and the TransAlta Utilities systems. These field measurements were analysed and reproduced on the three phase non-sinusoidal test systems at the National Research Council of Canada. Fifteen revenue meters were tested on the three-phase system with waveforms representing the field con

Aug 1, 1987 - Aug 1, 1988

Research

D981: Development of Analysis Procedures and Software for Determination of Source Direction for Power Line Disturbances

The measurement of power quality has gained priority in recent years. Fast growing digital technology has permitted an ever growing number of powerful and more precise devices being introduced in the market.Various power quality surveys have been performed by Canadian and US utilities. The first objectives of this project were to develop reliable procedures for identifying the direction of flow of each of the disturbances. The approach proposed in this report is to classify disturbances as stea

Apr 1, 1994 - Feb 1, 1996

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