The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
The article presents a study to determine the thermal transmittance for buildings different walls structure. Thermal transmittance is used especially in western European countries to indicate the rate of heat transfer for different components of buildings: walls, ceilings, floors, windows, doors, etc. The first part of the article includes several thermal transmittance introductive notions. The second...
The movement of know-how or technical knowledge from one organization to another known as knowledge transfer in literature is considered to be one of the most important components of the strategic plan of a research institute. Despite the fact that INCESA (Research Hub of Applied Sciences, University of Craiova) is a young organization, it already counts an important number of collaborations with...
This paperwork aims to present, after a general presentation of how to treat the neutral - izolated or by Petersen coil in the medium voltage supply, how the problems occur at the detection of earth faults in the medium voltage networks, of triggering erroneous lines without defect and not triggering of the defective lines (earthing), problems which may occur due to angle errors introduced by the...
The paper presents a study of electric field distribution on insulator strings, which are used for suspension of overhead transmission lines of 400kV and are stressed by power frequency voltage. The investigated insulator strings are used on transmission networks of National grid of Romania. The simulation uses the Finite Element Method (FEM) and COMSOL Multiphysics software to carry out the electric...
The expansion tendencies of microelectronics, communications and information technology have led-in what it concerns the power field to the appearing a lot of opportunities concerning the IEDs (Intelligent Electronically Devices) LAN communication and interconnection, involved in the technological flux. The paper contain, approach the technical issues related to reliable interconnection and communication...
In low voltage distribution electricity grids is important to examine how to protect against hazardous voltages and currents that can occur with insulation degradation. It was found that the treatment of neutral defect is important in those regimes, the present paper aim to analyze the networks with isolated neutral. Describing phenomena circuitry directly affected by faulty depend on the network...
Changes with the developments in the energy and electricity market brought the current issue of development models that allow the participation of all users to the consumer market. These models are essential, especially for household and commercial customers who represent the largest percentage of clients for the electricity company. Also a campaign for installing electronic measurements groups is...
In order to be competitive, retailers need to have good knowledge about their client's energy consumption patterns in order to acquire the right amount of electricity needed to maintain the supply and demand balance. Therefore in periods of high consumption, energy is more expensive than in low consumption intervals. This means that if two users for example have different peaks of load and energy...
History in use electromagnetic radiation in treating people various health conditions have a long history. Top questions about electromagnetic field effects occurred around the 40's in the same with the development of radar tracking systems. This paper aims to make an analysis of the studies and current research on the effects of electromagnetic fields on people health in the context of conflicting...
Electric domestic appliances are part of our daily life; they improve the quality of life. Concerning energy consumption of domestic appliances, great improvements was achieved these last years. The modern energy-efficient electric domestic appliances are electronically controlled. Generally, in a three-phase system, they constitute an unbalanced and nonlinear load. Their operation may cause power...
Compressed air occupies an important place among energy consumers in specialized industry. In this paper, the authors present the results of the monitoring and analysis for the parameters of a compressed air system to an industrial unit, obtained using equipment specialized in monitoring and measurements for compressed air.
The paper presents the importance of the steam generator in the operation of power plants, stressing the importance of their management and automation to increase energy efficiency of each link in the chain. It presents mathematical model in absolute units from the air preheater. Modelling is based on physical model of the air preheater steam generator, simplifying assumptions adopted and the conservation...
This article presents the study of connecting a lithium storage battery to the public distribution network. We are following the battery loading and unloading effects from the network and its influence on network parameters, namely: voltage, frequency, short term fliker, the total voltage harmonic distortion (THD-U).
The transition to renewable energy sources and energy efficiency have become a central topic, also for the producing industry in Romania and all over Europe. Saving energy is on the agenda for companies as well as facilities and public institutions. Energy efficiency in companies can be controlled and systematized in an energy management system. The ISO standard 50001:2011 enables companies and other...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.