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Electric power is the electrical appliances basic means for their functionality. In case that the electrical energy customer causes problems arise thereby complaints the power quality. In areas with frequent complaints of power quality measurements were made in order to resolve the reported complaints and also in order to investigate the cause of exceeding the compatibility level of power quality.
In 1997 cooperation began between the Faculty of Electrical Engineering and Computer Science and the power company CEZ on a joint project that involved monitoring selected voltage quality parameters. Over the course of several years measurements were carried out at 59 points of the distribution system at a low voltage (LV) level and their power supply nodes at medium voltage (MV) and high voltage...
Standard EN 50160 ED. 3 was released in 2011 and despite the fact that this is the third edition of this standard, it still does not limit values for all parameters at all voltage levels. This article examines the various methods of evaluation variables with two levels and then presents some recommendations for amendments undefined parameters vvn network in EN 50160 ED. 3rd.
In recent years, the utilizing of intelligent technology in a classical distribution and transmitting system becomes more and more important in all energy-related topics. The development bring us to the new era of power electrical engineering, to the era of Smart-Grids. These intelligent grids allow us to operate the grid with a specific set of requirements, such as bi-directional power flows, maximal...
Electricity and its deteriorating quality is increasingly becoming an important problem for the industry and service companies. A significant increase in the production of energy from renewable sources leads to the need to explore new ways of energy systems. It must be known reliability and responsiveness to changes in the network. Power quality and compliance with their parameters indicates the standard...
Electric power is the electrical appliances basic means for their functionality. In case that the electrical energy customer causes problems arise thereby complaints the power quality. Any complaints on the quality of electricity distribution companies must examine the best measurement at the point of complaint to power quality. In place of the complaint on the quality electric energy measurement...
High-quality supply of electricity is one of the most important part of the transmission of electricity to customers. For the supply of electricity distribution companies are responsible to face any complaints about the quality of electrical energy. All such complaints must examine the distribution companies and then determine what type of claim it is. Verifying the legitimacy of claims to power quality...
In the power company CEZ in the North Moravia Region (the Czech Republic) the monitoring of a number of selected parameters of the quality of electrical energy (harmonics, flicker and unbalance) is being carried out in cooperation with research laboratories of the Faculty of Electrical Engineering and Computer Science, VSB - Technical University of Ostrava. The monitoring is being carried out in a...
2-(4-Amino-substituted-3-nitrophenyl)-3-hydroxyquinolin-4(1H)-ones have been studied to evaluate their fluorescence properties and possible use as molecular fluorescent probes. The amino group was substituted with various alkyl moieties possessing a suitable terminal functional group (such as hydroxy or amino group) that could serve to bind a 3-hydroxyquinolin-4(1H)-one (3HQ) fluorescence label to...
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