In 2008, WWF (World Wide Fund for Nature) published Plugged-in: The end of the oil age making the case for Electric Vehicles.
This book aims to demonstrate how automotive electrification can ease the necessary transition towards a transport paradigm which is both highly efficient and compatible with a sustainable renewable energy future.
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By Isabelle Heriakian / Published on Mon, 2009-12-07 15:48
Prior to designing a power supply system for a building or other structure, a designer shall carry out a detailed analysis concerning the requirements for reliability of power supply of loads to be installed in the designed building or facility.
This chapter of the Guide for Design Engineers develops a step by step methodology to size the source power.
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By Isabelle Heriakian / Published on Thu, 2009-11-26 15:08
Written by Yurij Varetsky (Lviv Polytechnic National University, Lviv, Ukraine) and Zbigniew Hanzelka (AGH—University of Science and Technology, Krakow Poland).
The objective of this paper is to present performance peculiarities of industrial power systems using single-tuned filters for limiting harmonics and improving reactive compensation.
An industrial plant with existing harmonic problems was selected for investigation.
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By Isabelle Heriakian / Published on Wed, 2009-11-25 15:24
Written by David Chapman (CDA UK) and Roman Targosz (ECI), the briefing paper "collecting economic data in power quality survey" is available only to registered members of the power quality economics community of practice.
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By Isabelle Heriakian / Published on Thu, 2009-11-05 01:00
This case study presents a methodology for improving power quality in an important industrial estate. A project was initiated to reduce the number of interruptions and enhance power quality in the estate and focused on reducing weak points in the power distribution system by inspecting distribution lines in both customer and utility areas. Once weaknesses were identified, corrective action would be taken and preventative measures taken to prevent re-occurance in order to provide high power availability to customers.
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By Isabelle Heriakian / Published on Mon, 2009-11-02 13:36
A semiconductor plant experienced a problem where the LV side main circuit breaker was tripped by voltage dips. As a result, power to all connected loads was interrupted and manufacturing processes were halted. The main cause of this problem was the unsuitable design of the under-voltage protection system. When a voltage dip occurred it was misinterpreted as an under-voltage event by the protection system, which erroneously tripped the circuit breaker.
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By Isabelle Heriakian / Published on Thu, 2009-10-29 16:09
This guide presents a methodology based on standard PN-IEC 60354 to check overloading capacity of transformers. Main changes versus standard PN-71/E-81000 are discussed and step by step examples are given. An essential advantage of the recommended methods of verification of overloading capacity of transformers is that the size and cooling modes of transformers are considered.
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By Guy Kasier / Published on Wed, 2009-10-21 14:19
Once an electrical installation had been installed in a home in the past, that was it. So, when a domestic electrical installation was fitted, it was and in a many cases still is considered to be an unmodifiable fixture. In fact, it has always been quite difficult to make any changes to a classical electrical appliance once it is installed. Fortunately the arrival of integrated home systems means that such flexibility is now available to us (see: Definition of integrated home systems), even if the communications aspect (see: Increasing communication) is, admittedly, still in its infancy.
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By Dave Nolan / Published on Mon, 2009-10-19 21:33
Too often, energy costs are merely viewed upon as a necessary overhead. Many claim that energy management is one of the most promising profit improvement-cost reduction programmes available today.
Energy Management offers an opportunity for facilities managers to bring themselves into the boardroom. I am completing a MSc in facilities management and I need your help in a study for my dissertation that intends to establish a Best Practice (a step by step process to implementing specific energy conservation measures to reduce costs and increase efficiency).
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By Hans De Keulenaer / Published on Wed, 2009-09-09 11:54
This document is an overall report of the seminar “Electricity in the next decade”, the first in an annual series of events regarding “Low carbon electricity systems”. KEMA, ECI and Leonardo ENERGY are jointly organising these events.
Next to the topics presented during the first event, a few additional topics have been added in order to create a white paper and a more complete picture on the theme “Electricity in the next decade”.
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By Peter Vaessen / Published on Tue, 2009-09-08 07:04
An option when there is no alternative
It is clear that wireless power transmission systems in the range of 100 W to 100 kW cannot compete with traditional systems just looking at the costs. At places where economic competition is not the prime consideration, it can be an option. Microwave wireless power transmission can supply power to places that are difficult to reach. Especially small communities in rural areas could be supplied with power using WPT.
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By Hans De Keulenaer / Published on Wed, 2009-09-02 14:54
This paper presents the effects of voltage sags on domestic and office equipment and provides equipment sensitive curves for safe and reliable operation based on the experimental results.
With the increased usage of sensitive electronic equipments in various industries, offices and household appliances, it is important to protect them from any power quality disturbances to avoid unnecessary losses of any kind. From the several types of power quality disturbances, the most frequent and concerning for electric utilities from a customer point of view was voltage sag.
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By Sarah Hatch / Published on Tue, 2009-09-01 10:33
A task of the IEA 4E EMSA Project - The International Energy Agency (IEA) Implementing Agreement for a Co-operating Programme on Efficient Electrical End-Use Equipment (4E) was set up in 2008 and is currently supported by around 12 countries. A new Electric Motor Systems Annex (EMSA) was launched at the end of 2008 and is made up of a number of Tasks.
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By Stefan Fassbinder / Published on Mon, 2009-08-31 08:33
Why do we need transformers? The answer is simple: impedance. If power losses in electricity distribution networks are to be kept within reasonable limits, then large amounts of electric power have to be transmitted across long distances at the highest feasible voltage. In absolute terms, the higher the trans-mission voltage, the smaller the current and hence the smaller the (resistive) power losses in the transmission cables. But increasing the transmission voltage also reduces a given power loss in relative terms.
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By Isabelle Heriakian / Published on Tue, 2009-08-04 09:03
Industrial facilities are source of major disturbances to power system due to more and more large power loads being installed that, apart of their good functional properties, are characterised by negative impact on the quality of power.
The adverse impact of non-linear loads on a power system can be mitigated by means of compensation equipment like fixed capacitor (FC), thyristor controlled reactor (TCR) - FC/TCR.
The purpose of FC/TCR compensator is compensation of the fundamental component reactive power and filtering selected current harmonics.
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By Guy Kasier / Published on Wed, 2009-07-15 09:42
A WelHops study some years ago assessed the needs of the elderly regarding the buildings and surroundings in which they wish to live. Still as relevant today as it was when it was carried out, this study ran from May 2005 to September 2007 as part of a European INTERREG IIIC project. Taking part were partners from Italy, Sweden, the UK, Spain, and Hungary.
The project objectives were to: -
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By Isabelle Heriakian / Published on Tue, 2009-06-16 13:04
When the limit values of unbalance factor, specified in standards are exceeded, the use of symmetrizatin systems is required. A symmetrizator should not cause significant active power losses during operation, it implies that the symmetrization process shall be carried out by means of reactive elements (LC) or using active methods (power electronic systems). In this step by step guide, you will learn how to solve unbalance issues.
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Case studies
By HDK / Published on Mon, 2009-06-15 06:31
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