By Stefan Fassbinder / Published on Mon, 2010-02-01 11:25
At a distance of about 30 cm from a fluorescent lighting tube with magnetic ballast and electronic starter, which is normally regarded as fairly electromagnetically compatible, this mains independent, battery powered thermometer was operated. It displayed the temperature flawlessly until – oops – somebody switched off the light at the wrong moment. It’s all no use – the battery has to be taken out and put back in: the only way to get the thermometer functioning again.
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By HDK / Published on Wed, 2009-05-27 07:49
This paper presents a method of estimating the conducted electromagnetic interference EMI emissions in soft switching inverters.
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By HDK / Published on Wed, 2009-05-27 07:45
In this paper, the method of selecting dv/dt for EMI current ringing attenuation is presented. The mechanism for attenuation is first identified using the theoretical approach. It is shown that the attenuation occurs for rise time of the voltage equal to the inverse of the frequency of current ringing. The concept has been experimentally verified in DC chopper and frequency converter arrangements.
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By Hans De Keulenaer / Published on Mon, 2008-12-08 13:32
Electrical safety of low voltage supply systems is the subject of many national and international standards. Installation rules providing electromagnetic compatibility were introduced during the last decade, but still are not well known to installers and system designers.
From the perspective of electromagnetic compatibility, there must be no operating currents, not even stray currents (as defined in IEC 60364-5-54) flowing through the earth wire and earthing and equipotential bonding system.
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By Bryony Samuel / Published on Wed, 2008-12-03 11:10
Electromagnetic interference, EMI, has become very important in the last few decades as the amount of electronic equipment in use has increased enormously. This has led to an increase in the sources of interference, e.g. digital equipment and switching power supplies, and an increase in the sensitivity of equipment to interference, due to higher data rates.
This development demands high quality electrical installations in all buildings where electromagnetic non-compatibility leads to either higher costs or to an unacceptable decrease in safety standards.
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By Bryony Samuel / Published on Wed, 2008-12-03 11:07
This application note proposes a systems approach to the design of the earthing system. It has to perform three functions: conducting lightning and short circuit currents to earth, preventing the dangerous touch and step voltages and providing the low impedance, equipotential environment required for electronic and communication equipment. These functions are apparently contradictory but can be achieved by careful design.
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By Hans De Keulenaer / Published on Mon, 2008-09-22 10:00
The paper deals with the general analysis of one part of the electromagnetic compatibility (EMC ) problem — the electromagnetic coupling applied in the field of power electrical systems as. The simulation analyses and practical measurements of the electromagnetic coupling are presented in part II . Obtained results confirm the correctness of the theoretical analyses and so they can be used for predictive stating of EMC quality of individual new electrotechnical products.
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By Hans De Keulenaer / Published on Fri, 2008-07-25 12:09
By E Darie
This work analyses the operation of inverter-fed asynchronous motor drives accompanied by high-frequency interferences caused by parasitic currents of the common and differential modes. These emissions propagated by conduction and radiation may unfavorably affect the operation of nearby telecommunication and signal cables and various low-current devices. The study of these phenomena is based on theoretical considerations and numerical analysis.
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By Benoit Dome / Published on Mon, 2008-06-23 11:49
The influence of electricity and transmitters on our health
The term ‘electrosmog’ is being used more and more often. Questions have been raised as to whether this phenomenon is the cause of certain diseases and perhaps even some types of cancer. Should we be concerned? Are there ways to reduce the influence of electrosmog? And what exactly is electrosmog?
The possible effects of electromagnetic fields on our health are currently the subject of a very lively debate. Not only in the media, but also among responsible scientific and government bodies. For example, the Flemish government, acting on the principle that prevention is better than cure (see below), recently took the precaution of distributing a folder aimed at reducing mobile phone use by children. In Germany, the Ministry for the Environment has warned against the harmful effects of using Wi-Fi. Some people prefer to banish all electronic equipment from their lives, while others think that the situation is not all that serious. The debate seems far from over.
This briefing paper attempts to provide candid and unbiased answers and sketch the current state of knowledge. Legislation and possible preventive measures are also discussed.
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By HDK / Published on Wed, 2008-01-30 18:48
By M Bakkali et al
This study will provide us with the basic preliminary data to adjust it to the big ships considering the specificity of its self-sufficiency in: Generation-Production of Electric Power, Distribution and Consumption. Several possible solution ways are shown in this paper.
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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 Angelo Baggini / Published on Thu, 2007-02-01 14:03
A short eBook, from Engineering Consulting & Design to introduce the subject of power quality phenomena, the problems they cause and their solutions.
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By Hans De Keulenaer / Published on Sun, 2006-08-06 16:00
Power supply systems are becoming more powerful, which can lead to electromagnetic interference. On the other hand, digital networks are expanding, becoming more sensitive, performing at high data rates and increasingly used for safety related tasks. This development demands high quality electricial installations in all buildings where electromagnetic non-compatibility leads to either higher costs or to an unacceptable decrease in safety standards.
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By Isabelle Heriakian / Published on Fri, 2006-05-05 00:00
The paper is dealing with some electromagnetic compatibility (EMC) problems of converters and inverters, which are utilized for feeding of electric machines and its analyzing by PSPICE program. The main attention is focused on implications of parasitic capacitance and capacitive coupling existence.
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