Instytut Elektroenergetyki


Instytut Elektroenergetyki


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Moranda H.,Poznan University of Technology | Przybylek P.,Piotr Przybylek | Moscicka-Grzesiak H.,Instytut Elektroenergetyki
Przeglad Elektrotechniczny | Year: 2016

The subject of the article is the surface resistivity of pressboard immersed in mineral oil or synthetic ester. The changes of surface resistivity depend on the direction of water migration. The consequence of water migration from the cellulose into a liquid is the increase of the resistivity, while the migration of water from the liquid into the cellulose results in the decrease of the resistivity. Pressboard impregnated with mineral oil transferred to synthetic ester shows a sharp rise in resistivity, which is very beneficial, but requires clarification and further research. © 2016, Wydawnictwo SIGMA - N O T Sp. z o.o. All rights reserved.

The article presents issues related to the assessment of the dynamics of exchange of mineral oil to synthetic ester in cellulose insulation, and the problem of moisture evaluating of cellulose insulation filled with a mixture of mineral oil with synthetic ester. The research shows that the process of replacing mineral oil to synthetic ester is long, and the evaluation of moisture using FDS method based on patterns of cellulose-mineral oil results in an underestimation. © 2016, Wydawnictwo SIGMA - N O T Sp. z o.o. All rights reserved.

Moranda H.,Poznan University of Technology | Walczak K.,Instytut Elektroenergetyki | Moscicka-Grzesiak H.,Instytut Elektroenergetyki
Przeglad Elektrotechniczny | Year: 2016

The theme of the article are partial discharges on surface of pressboard immersed in mineral oil or synthetic ester. These are some of the most dangerous discharges. Partial discharges of surface type and sliding type were tested. It has been found that the partial discharges on the surface of the pressboard immersed in a synthetic ester have a slightly higher intensity than immersed in mineral oil. © 2016, Wydawnictwo SIGMA - N O T Sp. z o.o. All rights reserved.

Annual statistics concerning road accidents indicate the social issue (number of people killed in accidents) as well as economic issue (financial loss). This article deals with the impact of switching on the passing lights and the colour of the vehicle on the range of visibility. The research data presented in this article are to provoke the discussion whether it is arguable to use the passing lights during the day instead of day lights.

Rusek S.,Katedra Elektroenergetiky | Slivka M.,Katedra Elektroenergetiky | Gono R.,Katedra Elektroenergetiky | Szkutnik J.,Instytut Elektroenergetyki | Gawlak A.,Instytut Elektroenergetyki
Proceedings of the 7th International Scientific Symposium on Electrical Power Engineering, ELEKTROENERGETIKA 2013 | Year: 2013

The paper deals with the computation of distribution network components reliability parameters. Knowledge of the component reliability parameters in power networks is necessary for the reliability computation and also for reliability-centered maintenance system. Component reliability parameters are possible to retrieve only with accurate databases of distribution companies. Such a database includes records of outages and interruptions in power networks. It is impossible to retrieve reliability parameters from this data in a direct way because of heterogeneity. In this paper, we introduce some results of databases calculations. We apply this framework for the retrieving of parameters from outage data in the Czech and Slovak republics. There are also actual results.

The article presents the idea of the technical (patent application) solution permitting the recovery of the waste-heat from household equipment as washing machines, dishwashers, leading to the electric energy saving on level approx. 3% in relation to of each customer. Introduced also analyses of the influence of this type of the solution on the function of the network and connected with this the change of the level of losses in distributive networks. Described analyses indicate the legitimacy of initiating of this type of devices to the modern equipment new-constructed apartment buildings.

Zukowsk M.,Instytut Elektroenergetyki | Januszewsk M.,Instytut Elektroenergetyki | Kowali R.,Instytut Elektroenergetyki
Przeglad Elektrotechniczny | Year: 2014

This paper presents the tests results of a few devices used in the power industry with the disturbance recorder and time synchronization functions, conducted in order to determine their application in a distributed recording system allowing comprehensive analysis of substation automation systems. The test results also show the applicability of such devices to perform distributed recording system of selected analog current and voltage signals supplying a specific set of electrical loads. Such a system allows under real-world conditions to collect the data needed to perform the verification of algorithms that identify the type of the load device running as one of the many supplied from a common source voltage. Tests were performed for a number of protection devices: L90 General Electric and MiCOM P443 Schneider Electric and disturbance recorder BEN5000 Qualitrol company. The test results may be useful in the research project NCBiR PBS2/A4/8/2013. © 2014, Wydawnictwo SIGMA - N O T Sp. z o.o. All rights reserved.

Wojcik W.,Lublin University of Technology | Gromaszek K.,Lublin University of Technology | Kotyra A.,Lublin University of Technology | Golec T.,Instytut Elektroenergetyki
Przeglad Elektrotechniczny | Year: 2010

The article describes modelling of pulverized coal combustion with a single tangential burner for Model Predictive Control. Such algorithm supports nonlinear and multidimensional process description and easy constraints adding, which stands the advantage of predictive control. Actual information about the burning process allows to foresee and control the such complex process, considering strict NOx czy COx radicals emission rules.

Forecasting methods used up to now in case of very short-term prediction of power generated in wind plants and photovoltaic plants have been first characterized in the paper. Then concept of the system using fuzzy logic for very short-term forecasting of power generated in renewable energy sources has been described. At the end of the paper summary of the described issues and directions for further scientific works in the considered subject range have been presented. (Very short-term forecasting of power generated in renewable energy sources with the use of fuzzy logic).

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