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.
In previous papers, the authors have resumed the earth grounding dimensioning with the intend to propose optimum criteria and to simplifying the design procedure. Five general characteristic sizes for the earth grounding have been proposed that may be in as many objective functions. Of these, the footprint area, the total metallic mass and the earth grounding volume have already been approached with...
Properly sizing of earth grounding is a current issue of designers, because successive iterations required, which are determined by the nonlinearity calculating relations on the one hand and their complex structure, on the other hand. Continuing sizing methods improvement of the earth grounding, the paper applies three optimization criteria targeting the footprint minimizing, the total volume and...
The short time overvoltages and the voltage impulses represent Power Quality disturbances, with significant economic consequences, both for end-users and for suppliers also. Currently, there are defined too few sizes characteristic of these ones, insufficient for a correct assessment of their consequences. A new series of characteristic sizes both for short time overvoltages and voltage impulses are...
The design of earth grounding at rated values corresponding to the role to be accomplished is relatively laborious and there are no highlighted optimum criteria giving the justification for the chosen solution. The vertical earth grounding calculus is restructured in this paper, realizing sizing nomograms which include all characteristic sizes, the final goal being the determination of the electrodes...
The maim aim of this paper is to compare the rezults obtained for the steady-state run by using a new software, as Distribution Management System/Energy Management System (DMS/EMS) type, with the results delivered by traditional software products, as Paladin Design Base, which is extensively used in the design, analysis and maintenance of electrical networks. This comparison is particularly useful...
Voltage dips represent a Power Quality disturbance with the most significant economical consequences. However, too few of their characteristic sizes are defined, such as voltage sags amplitude and frequency. A new series of characteristic sizes for the voltage sags are justified presented in this paper, forming together with the already known a complete indicators family, for this aspect of Power...
Highlighting the inadequacies in terms of flicker indicators and proposals for overcoming them are the paper principal aims. High level sensitivity of the visual perception at luminance fluctuations as well as at flicker requires increased attention to this phenomenon, and also to the causes that produce them, careful highlighted in the paper.
To know the electrical power losses of an electrical network from an established perimeter and to adopt some measures in order to obtain their decrease represent very important problems in the electrical networks exploitation and maintenance. Thus, this paper aims to realize the model of the medium voltage (MV) network belonging to the electrical station Centre from the urban area of Cluj-Napoca in...
The flaring phenomenon or flicker is framed with no less than three indicators for which there are normalized values. The methodologies for determining indicators as flicker dose and severity as well as the voltage fluctuations limits use graphic functions, experimentally determined. A LabVIEW original program is used in order to identify the optimal analytical expressions for graphic or tabular functions...
In the domain of electrical installations, as in many other areas where theoretical researches are intertwined with the experimental ones, there are some dependencies that are known and used in the initial given form, which can be graphically or tabular. Correction of the demand coefficients based on the equivalent number of receivers, the protection characteristics of the fuses and the photometric...
Both suppliers and end-users are more interested in knowing the power quality (PQ) level through their common network. Unfortunately, there are no clear experimental methods and especially interpretable for all PQ aspects. This is also the case of the slow voltage variations about which it is theoretically known that they include variations with periods between (5 min+24 h), so practically the voltage...
The power quality (PQ) indicators, related to slow voltage variations, are expressed usually both absolute and relative values. Consequently, the paper presents the complete family of slow voltage variations indicators in expression of absolute, relative and percentage. The necessity of an expressive analysis of voltage variations led to idea of the voltage wave decomposition in actions and harmonics...
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.