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, 2010-01-12 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 Jonathan Manson / Published on Mon, 2009-01-12 16:45
By Jonathan Manson and Roman Targosz
Since the end of the 1990s the European Copper Institute [ECI] has been concerned about the impact experienced by commerce and industry of the changing nature of the energy demands organisations face as a result of equipment technological advances, the increasing need o build in resilience into their electrical power installations and the presumed mounting costs of not taking either adequate preventative or reactive action to accommodate the changes.
After some preliminary small scale studies into the impact of poor power quality on such organisations and as the empirical but anecdotal evidence mounted being discussed at length among the growing membership of the Leonardo Power Quality Initiative [LPQI*], so ECI decided to mount an extensive research project into what the impacts were on key energy suing industrial sectors of their not coping with poor power quality.
The project itself took over two years to complete and its results have been exposed in 2007 to a broad technical academic community with a view to securing their support and agreement for this work, the findings of which, whilst not surprising to us, make very negative reading in terms of the avoidable wastage and economic losses incurred by these industrial sectors at a time when energy and resource efficiency are the demands of today. Apply this to more commercial interpretation and it is clear that the EU’s competitive position is also unnecessarily undermined asa a result of this wastage.
This report presents the European PQ Survey – it is clear that the industrial sectors interviewed annually lose upwards of €150 billion as a direct result of their electrical power installations not being sufficiently reliable and resilient for today’s and future operating demands.
The causes of these losses are not new nor are the Power Quality [PQ] phenomena involved. What was both surprising as well as concerning was and we suspect is still the relative lack of analysis and measurement that take place among these power critical industries to be able to know what is causing these damaging interruptions to their operations.
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By Bryony Samuel / Published on Wed, 2008-12-03 10:29
Voltage disturbances are the most common PQ problem causing effect ranging from minor annoyance through equipment failure to the shutdown of complete production processes. The economic impact can be very large and can threaten the economic viability of a business. This section of the Application Guide covers various aspects of voltage disturbances.
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By Angelo Baggini / Published on Mon, 2008-03-17 14:30
Born from the experience of Leonardo's award winning Leonardo Power Quality Initiative, on April 11th, the new Handbook of Power Quality will be available worldwide, published by Wiley.
The book uses the perspectives of both power suppliers and electricity users, with contributions from experts in all aspects of PQ providing a balance of scientific and practical information on:
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By Angelo Baggini / Published on Mon, 2008-03-10 17:42
During normal operation supply voltage is provided by the network to the load at rated value.
In the event of a voltage dip, it is possible to maintain rated voltage by installing a dynamic voltage restore.
This animation shows the principle of automatic voltage dip mitigation equipment's operation.
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By Hans De Keulenaer / Published on Tue, 2008-02-19 17:45
By J Cobben et al
Given the nature of electricity, every party connected to the power system influences voltage quality, which means that every party also should meet requirements. In this field, a sound coordination among technical standards (system-related, installation-related and product-related) is of paramount importance. Further, characteristics of currents (e.g. inrush currents, harmonic currents) should be explored as well their interaction with the voltage. This is also influenced by the impedance of the grid provided by operators. In order to clearly identify responsibilities for voltage quality disturbances on the point of connection (POC), voltage and current requirements have to be available at the POC. Presented in this paper is the relation between inrush currents, flicker severity levels and grid impedances in the low voltage grid. Furthermore maximum harmonic currents at the POC in low voltage grids are determined by using these grid impedances.
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By Hans De Keulenaer / Published on Thu, 2007-04-12 10:40
Steep voltage changes caused by IGBT frequency inverters may cause overvoltage problems in induction motors. Filters are introduced in order to limit the rate of change of the voltage du/dt. This animation shows the effect of such filters on the transient waveform.
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By Hans De Keulenaer / Published on Wed, 2007-01-31 11:05
On 21 December 2006, ERGEG launched a public consultation on the paper Towards Voltage Quality Regulation In Europe, An ERGEG Public Consultation Paper. This is a 9 week public consultation, which ends on 22 February 2007.
The paper sets out ERGEG’s views on the issue of voltage quality and is interested in receiving inputs from stakeholders. The paper raises a number of questions such as whether recommendations for revising voltage quality standard EN 50160 are adequate, upon which comments by stakeholders are requested.
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