The developed software for the short-circuit analysis is intended for the students of the power engineering study programme offered by the University of West Bohemia. The program is based on the method of symmetrical components. The power system elements are modelled by equivalent ...

The daylighting and the artificial lighting is a part of environment. The lighting plays an important role in life of everyone of us. We know that it is not possible fully replace daylighting by artificial lighting. The amount of daylight is important mainly in areas with...

Dieser Eintrag beschreibt die Problematik von Doppelerdschlüssen in einem Mittelspannungsnetzen. Es wurde eine Messung an einem Notzmodell mit eingebauter Distanzschutz durchgefürt, und der Eintrag enhält beschreibung und die Ergebnisse von der Modelation.

The quality of input data is essential at designing systems for combined heat and power production. Because of relatively high investment coasts, it is needed to select a suitable electrical adn/or thermal output, so that the system´s yearly utilization ratio is as high as...

This article deals with possibility of biomass utilization and methods of its processing. Further deals with a heating power and characteristic of each biomass fuel. Sources of biomass fuels and their power potential are described. At the end are described two power plants, which&#...

This article presents the general information about the opportunities for utilization of renewable energy resources for electrical energy generation in the Czech Republic and the forecast to 2010. There are several types of power generators that can be used in a power system. In&#x...

This article presents the general information about the opportunities of renewable energy resources in the Czech Republic and the forecast to 2010 in power engineering. The future for renewable energy resources in Czech Republic looks more promising then ever. The utilization of renewab...

The document describes influence of basic meteorological value to proposition of photovoltaic arrays. Results from 3 years long measurements on demonstration system are displayed in supporting figures and tables. Next part features experiences gained during installation and trial run of 20 k...

Recently the range of types and the number of units of power electronic systems and other equipments causing harmonics and interharmonics rise sharply. This paper describes how and why harmonics and interharmonics are generated, how their presence affects the electrical system and equip...

This paper deals with the evaluation of renewable and alternative energy sources network interconnection and their impacts on the operation and stability of electrical network. The article shows the dependence of the voltage level magnitude in the point of common connection on the ...

Although the number of nuclear scientists and technologist may appear to be sufficient today in some countries, there are indicators, e. g. declining university enrollment, changing industry personnel profiles, dilution of university course content, and high retirement expectation, that future ex...

This article presents the current situation of renewable energy resources in the Czech Republic from the point of view of wind power energy and describes some of their technical operation problems. The utilization of renewable energy resources is the priority of the energy industry...

Power levels of new wind power units are increasing and their axes reach heights about 100m over ground with the rotor diameters about 90m for 4MW unit. It is very necessary to know long term average values of the wind speed and others stream relations in these ...

The use of renewable energy sources is very fashionable nowadays. But is it really the best way to solve the growing lack of energy? Are thermosolar and photovoltaic systems pleasant for our environment? These and similar questions must be seriously examined and the public mus...

In the Czech Republic there appeared a unique phenomenon in the dynamics of wind energetics development after 1989. This article presents the current situation of distributed power systems in the Czech Republic, especially from the point of view of wind power energy.

In previous periods, the photovoltaic generator installation numbers were limited by the very high installation costs. Now is great press on the environment protection in order the emission of the classic fossil fuels should be reduce and therefore the higher utilization of the ren...

The human factor is one of the main elements which can cause a fault in a distribution network. If we need a distribution network without any fault, we must improve the knowledge and skills of workers in any distribution system. The knowledge can be improved during l...

The objective of this paper is to sketch, in a general context, influences on construction of wind power plants and problems associated with them when choosing the right area for their construction.

This article talks about current situation of renewable energy resources in the sea area from the point of view of wind energy. The possibility of utilization of sea wind energy for electric generation is known. But the possibility supply with thouse energy also the Czech ...

The usage of solar cells is growing up, but the availability of pure silicon – the main element of cells is almost stagnating. This article describes the situation on the silicon market and evolutions in behaviour of the leading companies.