Case studies
By HDK / Published on Mon, 2009-06-15 06:31
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By Glycon Garcia / Published on Fri, 2009-06-12 08:35
In late 2006, the U.S. Agency for International Development, the International Copper Association, and AES Eletropaulo, an electricity distribution company, embarked as partners on an ambitious project in São Paulo, Brazil to test their integrated approach to slum electrification and loss reduction.
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By Isabelle Heriakian / Published on Mon, 2009-05-11 09:17
A theatre encountered a situation where incorrect operation of the earth fault protection system of a back-up generator tripped the circuit breaker unexpectedly when dimmer loads were fully used.
The generator was used to supply critical loads via an automatic transfer switch (ATS) and the problem was caused by high levels of third harmonic current produced by dimmers and an inappropriate installation of neutral and ground system.
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By Sergio Ferreira / Published on Mon, 2008-11-10 16:30
This Application Note aims at describing the use of energy and the potential energy savings in the hotel sector, on the basis of theory and practical case studies. Hotels and restaurants represent some 9% of total energy consumption in the utility buildings sector. Utility buildings are offices, shops, hotels, restaurants, educational establishments and care institutions.
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By Hans De Keulenaer / Published on Wed, 2008-06-11 18:18
The implementation of capacitor reactive power compensation in the Lubin Mine has produced the expected technical and economic effects. One should, however, be aware that compensation could be applied only to the level determined by reactive power demand. Currently this level in the Lubin Mine is 11‑12 MVAr. In case of a significant increase of the concentration of output in the distant areas of the mine, other technical measures will be necessary. The objective of a currently undertaken study is to develop a technically and economically feasible method for power supply of distant production sections, which consists in their electrical separation. All concept studies of the power supply system development should also take into consideration rational management of reactive power in both the supply networks and the loads. The rational management of reactive power should be based upon a continuous monitoring of load and reactive power flow.
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By David Chapman / Published on Tue, 2008-05-13 15:53
Wind Farm Development and Operation - A Case Study dicusses the development of a small wind farm. It includes a financial analysis highlighting the importance of an accurate energy yield assessment and adequate feed-in tariff.
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By Hans De Keulenaer / Published on Thu, 2008-02-28 15:32
By Dragomir Vasic
In this reader article, Dragomir Vasic introduces a basic technique of frequency regulation for preparing the fuel-air mixture in hot water boilers used for district heating. This simple and relatively low-cost measure saves 25,000 euro per year, with a payback of just 0.6 years.
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By Stefan Fassbinder / Published on Mon, 2008-02-11 15:08
These 2 case studies demonstrate that high-quality rewiring of domestic electrical systems in older residential buildings can yield a significant increase in home comfort.
We describe some examples of electrical refurbishment work aimed at illustrating how electricians can tap into this market.
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By Sergio Ferreira / Published on Fri, 2008-02-08 16:53
This Application Note describes the use of energy and the potential energy savings in the hospital sector, on the basis of theory and practical case studies. Hospitals represent some 6% of total energy consumption in the utility buildings sector, which includes offices, shops, hotels, restaurants, educational establishments and care institutions.
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By Sergio Ferreira / Published on Fri, 2008-01-25 16:16
By Roeland De Meulenaere
With all the environmental problems caused by CO2 emissions, energy saving is a hot topic at the moment. Buildings represent a sizeable amount of enery consumption and also a great potential for energy savings still to harvest.
But how much do energy savings cost? How long does it take until you recover your investment? Where can you save energy? And how much CO2 emissions are actually avoided?
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By Hans De Keulenaer / Published on Wed, 2008-01-23 19:26
By A Baggini at al
The installation of non linear loads determines the presence of current and voltage harmonics and interharmonics. Components particularly sensitive to this kind of phenomena are power factor correction equipments. This paper describes the design process of a centralized PFC system under harmonic pollution conditions pointing out the key role of measurement campaigns.
Summary
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By Isabelle Heriakian / Published on Tue, 2008-01-22 03:00
A new case study by Michèle De Witte, Laborelec.
A steel manufacturing plant was experiencing a flicker problem. Lights in the office areas of the plant were often flickering, affecting productivity and creating an irritating nuisance for employees.
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By Isabelle Heriakian / Published on Mon, 2008-01-21 03:00
A new case study by :
Andreas Sumper, Roberto Villafáfi la, Rodrigo Ramírez,
& Paola Pezzini
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By Isabelle Heriakian / Published on Fri, 2008-01-18 14:33
By Sylvain Doucement, Laborelec.
Industries in Europe are generally connected to the distribution grid. Specific companies, though, are great energy consumers and have been directly connected to the transmission grid.
While the distribution grids are ruled by strict standards concerning quality of supply, comparable standards aren’t available for transmission level. Consequently, transmission grid operators determine perturbation emission limits for each grid user separately.
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By Hans De Keulenaer / Published on Tue, 2008-01-08 17:27
The Belgian site being studied in this paper is connected to the public transmission grid (380 kV) by a High Voltage (HV) station. This HV station incorporates a 25 kV substation linked to a second substation via 25 kV underground cables. The second substation supplies the electric installations on the site.
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By Hans De Keulenaer / Published on Wed, 2008-01-02 18:03
A power quality case study
By Michiel Van Lumig, Laborelec
Various departments at a car manufacturing plant are suffering from regular process outages due to voltage dips. These dips are causing production losses in the Metal Operation, Spray Coating, and Assembly departments that directly affect the productivity of the plant. The cost of those losses is directly related to the profile of the voltage dip (duration and depth).
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