The Electric Power System (ES) must address two unique requirements - the need to maintain balance between generation and load, at the required time and with the required quality, and the need to adjust generation (or load) to manage power flows through individual transmission ...

The topic of the article is new insights into the load of transformers depending on their own losses. Transformers are among the most common, but important elements of the transmission and distribution networks. This is a reliable device with a guaranteed lifetime at the level...

The article deals with optimization of the energy consumption of the building with photovoltaic system (PV). The first part briefly describes the building with implemented measuring and regulation system (the hardware platform, connection and real installation). Next part deals with possibilities...

The article deals with measurement of indoor environment parameters in a classroom equipped with heat recovery unit. The first part of the article is devoted to the own measuring system which is based on NI hardware (LabVIEW) in combinations with measuring sensors. Next part s...

This paper is focused on modeling of existing cogeneration power plant with backpressure turbine in Pilsen. The first motivation of the modeling is better understanding of all cycle features and its limitations. The second motivation is further investigation of some innovative implementation...

Standard short circuit tests of HV SF6 circuit breakers need high power sources and special synthetic facilities. Tests consist of many standard disciplines. Each of short fault disciplines requires high parameters from high power sources. They also require exact measurement and accurately&#...

In this article, we investigate the periodic nonlinear second order ordinary differential equation with damping u''(x) + r (x) u'(x) + g(x, u(x)) = f (x) , x ∈ [0, 2π] , u(0) = u(2π) , u'(0) = u'(2π) , where g is a L1-Caratheodory function, r ...

Continuity of supply can be regulated by a national regulation authority to maintain or improve its level. Short interruptions are monitored and regulated much less frequently than long interruptions. They can occur as single event or in sequences cased by a single power system...

Enrichment of austenite with carbon in the course of austempering is a fundamental mechanism which leads to incomplete bainite transformation. Higher carbon content in untransformed austenite, together with the presence of silicon, is understood to lead to stabilization of austenite. As a&#x...

This article discusses the influence of passive solar systems auxiliary mounted in office building on thermal comfort. Applicable measurement methods are compared on real passive solar systems including the elimination and correction of instrumentation uncertainities. The main chapter deals with ...

Geometry models for Monte Carlo transport codes have been using standard constructive solid geometry (CSG). The standard approach is using analytical equations for defining surfaces from which spatial cells are constructed. Both union and intersection operators are available, therefore, arbitrary ...

This article discusses issues of photovoltaic panels malfunctions and failures. Different detection methods are applied on 300 real installations to identify origin, quantity and time progress of most common malfunctions. This paper focuses only on operation failures while malfunctions generated ...

This article describes evaluation and application of low cost data acquisition device for selected tasks in electrical power engineering. The first part discusses theoretical and technical limits of NI PCI-6221 DAQ. Following chapter inscribes application for current / voltage measurement an...

The pebble bed reactor is randomly filled with thousands of spheres with fuel and moderator elements known as pebbles. Each fuel pebble contains thousands of coated TRISO particles stochastically embedded in the graphite matrix. Compared to PWR reactors with a regular lattice of fu...

This paper deals with the topic of high voltage circuit breakers’ reliability in relation to theirs design and service conditions. The motivation for the subject comes from multiple failures analyses and continuous efforts to maintain power systems safe and reliable. The paper contains&...

The description of differences between measurements methods leakage current are in this paper. Differences between laboratories are in number of test level, time on test level and quantity of reading from the instruments. Analysis of differences searched better process for measurement of...

The purpose of the paper is to describe the measurement system for heat recovery unit. A long-term measurement of the indoor environment parameters was performed in a classroom equipped with Whisperair heat recovery unit produced by 2VV. The main observed parameter was the evolutio...

This paper is focused on the assessment of suitability of both possible turbines, which can be operated in current co-generation power plants. Pros and cons of both turbines are described and summarized in the main part of the paper. The assessment is based on real requir...

The paper describes a mathematical model of induction crucible furnace. The main purpose of the article is to study influence of inductor frequency and electric current on axial melt velocity. The material used for calculation is Wood’s metal. The considered problem contains electromagn...

The following paper contains a brief description of current state of software development for calculation of island operation possibility in city of Pilsen. This software is based on MATLAB frequency stability simulations and is developed in MATLAB AppDesigner environment. Runtime&#x...