Wyniki 1-6 spośród 6 dla zapytania: authorDesc:"Daniel KORENČIAK"

Opportunities for integration of modern systems into control processes in intelligent buildings

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This paper presents different approaches to development of modern methods and control systems based on analysis and implementation of modern control methods. They utilize principles of robust control for thermal processes in intelligent buildings and method of Internal Model Control to calculate robust regulator parameters at non-parametric and parametric uncertainties in process model. The paper describes realized increase in robustness of control algorithm by means of programming module implemented into distributed control system based on LONWORKS technology. Streszczenie. W artykule przedstawiono odporne sterowanie procesami ogrzewania w inteligentnym budynku. Uwzględniono niepewności modelu. Wykorzystano technologię LANWORKS. (Możliwości integracji systemów sterowania w inteligentnym budynku) Keywords: Methods, intelligent buildings, LONWORKS, regulators, temperature. Słowa kluczowe: budynek inteligentny, sterowanie temperaturą. Introduction Complex control systems nowadays are designed for wide range of industrial applications. They are focused on effective management of composite processes, energy savings and optimization of production and technological processes. Intelligent buildings utilize synergy of software and hardware representing one of the widest area for application and integration of information systems, information technologies, communication systems, modern control systems and control algorithms. Application of automatic building control aims for creation of such conditions so that technically complicated and complex building could become "intelligent“. It means that it should be able to adapt to the change in internal and external conditions and so meet requirements of the owner, user and residents. This objective could not be fulfilled solely by application of advanced and most sophisticated automatic control. Automatic control needs to be combined with intelligent technologies and intelligent architect[...]

Analysis of humidity influence in a transformer model

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To prevent failure states of transformers, we perform different types of measurements. They shall illustrate a momentary state of the measured equipment and if necessary to draw attention in advance to changes of parameters, which have specific relationship to no-failure operation of the equipment. Water presence in oil transformer causes deterioration of its insulation and finally thermal defect of solid insulation Streszczenie. W artykule przedstawiono analizę wpływu wilgoci w transformatorach olejowych na przyspieszenie starzenia się materiałów izolacyjnych. Na podstawie analizy przewidzieć można potencjalne uszkodzenia i sposoby ich eliminacji poprzez zmianę parametrów transformatora. (Badania i analiza wpływu wilgotności na podstawie modelu transformatora) Keywords: Humidity, transformer, insulation resistance, dissipation factor Słowa kluczowe: wilgotność, transformator, rezystancja izolacji, współczynnik rozproszenia. Introduction State of new insulation in operation mostly deteriorates due to surface contamination of insulators and insulation, their moistening and ageing. If no measures are taken in time so as to avoid this degradation, the situation usually results in damage of insulator and consequently in stop of electrical device. State of insulation of important electrical devices, such as transmission transformer which bring huge economic cost due to each stop in operation, needs to be checked regularly. Water presence in oil transformer causes deterioration of its insulation and finally thermal defect of solid insulation. Dielectric warming can be so high that the temperature increase is out of control and transformer becomes dangerous for its surrounding. Analysis of humidity by measuring of insulation resistance The oldest and easiest method of inspecting the state of [...]

Analysis of pressure ratio in the intake in dependence on high-voltage behaviours

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Power control in spark ignition engines by regulating the intake air is performed. The control unit needs information about the air pressure conditions which then enters the combustion chamber. The information about the intake air pressure is an important quantity for optimal control of combustion mixtures. The paper describes some types of sensors that are used to measure the air intake temperature. Air pressure in the intake manifold affects the operation of the engine and also the extent of the loss or utility of the engine operation. Size of the over voltage sparks is also influenced by the air pressure in the combustion chamber which is proportional to the pressure manifold. Streszczenie. W artykule przedstawiono wyniki badań dotyczących sterowania energią w silnikach o zapłonie iskrowym, poprzez regulację dostarczanego powietrza. Opracowany algorytm korzysta z informacji o ciśnieniu powietrza w komorze spalania. Omówiono także niektóre rodzaje czujników pomiaru temperatury pobranego powietrza. (Analiza zależności ciśnienia w otworze dolotowym od wyładowań elektrycznych). Keywords: air pressure sensor, control, over voltage, Spark. Słowa kluczowe: czujnik ciśnienia powietrza, sterowanie, przepięcie, iskra. Introduction The intake air together with fuel creates burnt fuel mixture and combustion process takes place in the combustion chamber of engine in the cylinder. Correct composition of fuel mixture is the main requirement to get the maximum desired engine torque, the lowest possible fuel consumption and also the lowest volume of emissions in the exhaust. Control unit regulates the composition of the mixture with aim to control the throttle opening and regulate opening of the injection valves. Throttle regulates the amount of incoming air. Control unit needs to obtain information about air pressure in the intake manifold through the pressure sensors for appropriate setting of throttle. Four-stroke engines are characterized by t[...]

Analysis of thermal processes in oil distribution transformer DOI:10.12915/pe.2014.05.017

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Paper deals with the analysis of thermal processes in oil distribution transformers. By means of the mathematical analysis and experimental measurements it is possible to diagnose of power oil transformers in terms of mechanical strength of winding. Analysis of warming at varying loads is very importance, since allows determining the load capacity and overload of the transformer under various operating conditions and respecting the variable ambient temperature. Streszczenie. Artykuł dotyczy analizy procesów termicznych w rozdzielczych transformatorach olejowych. Za pomocą analizy matematycznej I pomiarów doświadczalnych można dokonać diagnozy olejowych transformatorów mocy pod względem wytrzymałości mechanicznej uzwojenia. Analiza nagrzewania się uzwojeń przy zmiennych obciążeniach jest bardzo ważna, gdyż pozwala na określenie nośności i przeciążenia transformatora w różnych warunkach eksploatacji w odniesieniu do zmiennej temperatury otoczenia. (Analiza procesów termicznych w rozdzielczych transformatorach olejowych). Keywords: transformer, thermal processes, thermovision, windings, temperature. Słowa kluczowe: transformator, procesy termiczne, termowizja, uzwojenia, temperatura. doi:10.12915/pe.2014.05.17 Introduction Electric energy lost in transformer in conversion of alternating current is converted into heat in winding, magnetic circuit and in other parts of the transformer. At the same time transformer heat´s up and the temperature of its individual parts can greatly exceed the ambient temperature. With increasing load and with emerging losses the temperature of the transformer rises, this all depends on cooling winding, magnetic circuit and other heated parts. As far as temperature, transformer is inhomogeneous element. Sheets of magnetic circuit are characterized by high thermal conductivity and relatively low thermal capacity. They are taking turns with layers of insulation (lacquer etc.), whose thermal[...]

Nondestructive diagnostics of electrical systems and equipments DOI:10.12915/pe.2014.03.041

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This paper analyses the problem of thermal sensors, it examines the principles, functions and application for a non-contact temperature measurements. The knowledge in measurements of infrared radiance allows us to use the methods of thermovision diagnostics more effectively and to localise the disturbance which determines the quality of connection in distribution of electric energy. For technical testing of electrical systems and equipment thermography is an important diagnostic method for determining of failure of electrical systems and equipment as well as for detection of worsened condition of these systems. Streszczenie. W artykule przedstawiono problematykę termicznych sensorów, zasady badań uwzgledniające bezdotykowe pomiary temperatury, ich funkcje oraz wnioski. Dotychczasowa wiedza o pomiarach w podczerwieni pozwala na efektywniejsze wykorzystanie metod termowizyjnych celem lokalizacji zakłóceń związanych z jakością połączeń odpowiadających za dystrybucję energii elektrycznej. Termografia jest nieniszczącą metodą diagnostyczną pozwalającą na badania instalacji elektrycznych i sprzętu w celu określenia uszkodzeń urządzeń i systemów elektrycznych, a także do wykrywania pogarszania się ich stanu. (Nieniszcząca diagnostyka systemów elektrycznych i urządzeń). Keywords: Thermovision, radiation, calculation, thermogram. Słowa kluczowe: Termowizja, promieniowanie, kalkulacja, termogram. doi:10.12915/pe.2014.03.41 1. Introduction In measurement of electrical equipment and wires we deal with warming of contacts, switches, power cables, clamps, contacts of fuses. In electrical substation, temperature of each object is measured, focusing on the expansion joints, junctions, bends and coats drivers. Thermovision is used to measure warming of connections and clamps in electrical machines, as well as to the measurement of electrical equipments in the internal and external electrical distributing systems. Fundamental for a non-destructive dia[...]

The delay line with a surface acoustic wave for an oscillator of electric signals in some sensors DOI:10.15199/48.2018.03.38

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As selective elements of oscillators of harmonic vibration besides the band-pass filters are also used delay lines (DL) and resonators as a perspective a coustic-electric components based on surface acoustic waves (SAW). From the stability point of view we can classify these oscillators among the ones with volume acoustic waves and LC oscillators. In the article, the DL with SAW for single - mode oscillators. The oscillator with delay line The basic principle of function of oscillator with delay line is represented on the next figure (Fig. 1). The delay line (4) with SAW plugged in the feedback of amplifier (2) is a basic element. Circuits (1, 3) serve to match impedance of the abovementioned to the impedance of the electronic circuitry. Fig.1. Bloc diagram of oscillator. Because the previous signal from the input to the output of DL is delayed, examined oscillators are ones with delayed feedback. The theory of these oscillators is well known in the literature [1]. Different situation is in the case of DL with SAW, where DL themselves have narrow transmission band and their parameters differ fundamentally in this range. Physical distinctiveness of functioning of listed components which are related with phenomena of excitation, extension and reflection of SAW cause that in addition to delay, the DL´s have specific frequency dependencies of input and output admittances. Their replacement with the lumped elements RLC circuit or broad - band DL with outer selective LC is mentioned only very general. The oscillator with mismatched delay line The used delay line with SAW as a selective element of oscillator can be symmetrical or non-symmetrical. Symmetrical DL is characterized by the same input and output IDT while non-symmetrical DL has the input IDT with small number of electrodes (broadband) and output IDT with big number of electrodes (narrowband). In the contribution we will only deal with the symmetrical DL. For simpl[...]

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