By Isabelle Heriakian / Published on Fri, 2007-10-12 16:59
Created in 2001, LPQI has grown into a partnership community of 100 authorities in the field of power quality. They range from academic and polytechnic institutions to engineering companies. LPQI aims to provide end-users and business decision makers with facts and best practices to improve power quality in the non-residential sector and to raise awareness among policy makers. LPQI European education programme reaches 100 000 professionals each year.
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By Isabelle Heriakian / Published on Thu, 2010-03-11 16:08
A prospective wind farm consisting of 21 turbines with 2 MW double-fed induction generators is planned to be connected to a 110 kV substation in distribution system.
In this case study, different network configurations are modelled.
The influence of the accuracy of grid modelling on grid harmonic impedance characteristic at a particular point is analysed, and a comparison of the results is done for the different network configurations.
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By Isabelle Heriakian / Published on Tue, 2010-03-09 16:20
This case study is an assessment of electric power quality in a low voltage supply network in rural environment, based on measurements.
The subject of measurements was a low voltage line in which large disturbances occurred in the supply voltage, being the cause of customers' complaints. A modernisation of the installation was done; additional insulated cable was added and then the MV/LV transformer was replaced with a new one of larger rated power.
The conclusion from the final measurements is to consider other mitigation solutions.
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By Isabelle Heriakian / Published on Thu, 2010-03-04 17:44
This case study presents the control of quality parameters of electric power supplied from a low-voltage network to household consumers and public utility buildings.
The measures aimed at the power quality improvement, taken by the electric power supplier, are presented.
A comparison is done before and after replacement of a transformer to assess whether or not the choice was right.
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By Roman Targosz / Published on Thu, 2010-03-04 13:41
PQ01: Introduction to Power Quality. Voltage Dips and Short Interruptions - February 2010
- Izaskun Azcarate
- Iosif Borcsa
- Bert van Bruchem
- Alejandro Castellanos
- Kok Wai Chan
- Andre Domingues Rocha de Oliveira
- Gabriel Ricardo Ferreira Queiroga Mafra
- John Han
- Edwar Hernandez
- Danijel Hodzic
- Sjur Kilde
- Mike Lankford
- Piotr Łaszczych
- Chris Nerli
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By Fernando Nuno / Published on Thu, 2010-03-04 12:54
Following the training course on electricity markets regulation, a set of support papers is being delivered to complete the didactic set.
This paper explains the various concepts about the regulationof the power quality: quality regulation, commercial quality, reliability, performance publication, standards and quality incentives schemes.
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By Roman Targosz / Published on Wed, 2010-02-03 17:56
Leonardo ENERGY is launching a comprehensive e-learning multi-course on Power Quality.
The list of courses:
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By Roman Targosz / Published on Tue, 2010-02-02 17:21
The second course in the comprehensive programme on power quality covers the subject of harmonics and interharmonics.
The knowledge acquired during the course should be sufficient for:
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By Fernando Nuno / Published on Tue, 2010-01-12 12:23
The intention of the organisers is to give an opportunity to academics, scientists, engineers, manufacturers and users from all over the world to come together in a pleasant location to discuss recent development in the areas of Renewable Energies and Power Quality.
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By Roman Targosz / Published on Tue, 2010-01-12 11:43
Leonardo ENERGY Academy launches its e-learning initiative with a comprehensive programme on power quality. The first course introduces the topic of power quality and then focusses on voltage dips and short interruptions.
The course should take between 12 to 20 hours for participants with an electrical engineering background. Participants are expected to finish the course by the end of February (28-02-2010).
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By Isabelle Heriakian / Published on Thu, 2009-12-17 17:51
In this guide, circuit protection is detailed as a way to ensure an installation is safe and functional. This document is concerned primarily with protection against the effects of over-currents and fault currents for property protection, but the improvements presented may also lead to secure people as an indirect benefit. There is a focus on circuit breakers as well as on issues that are likely to arise in circuit maintenance and it takes a systemic approach.
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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 Tue, 2009-11-03 13:09
Setting up a production process for the pharmaceuticals sector is not a trivial undertaking.
Electrical power variations or even minor interruptions can neutralise tightly controlled biological working conditions and ruin an entire batch, resulting in irretrievable production losses.
The longer the event, the harder a pharmaceutical company’s profit margins are hit. Ensuring continuity of power supply is therefore of fundamental importance for this sector.
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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 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 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 Isabelle Heriakian / Published on Tue, 2009-08-04 09:21
A power supply interruption to an oil refinery can trigger a chain of catastrophic events.
This is due to the multiple interlinked chains of electrical systems and the mixture of highly volatile materials on which the processes are based.
Ensuring power system reliability is essential to avoid putting staff and neighbouring areas at risk, and to minimize costly incidents and production stoppages.
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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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