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Losses and power balance in hydraulic satellite motor supplied with oil and HFA-E emulsion
PublikacjaMineral oil and HFA-E emulsion are liquids which differ in viscosity, density and lubricant properties. Therefore, supplying hydraulic satellite motor with these liquids, differences between quantity of hydraulic, volumetric and mechanical losses are observed. These losses influence efficiency of conversion of hydraulic energy into mechanical energy and thereby power balance of motor. The research of satellite motor has been conducted...
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Selected Aspects Of Building, Operation And Environmental Impact Of Offshore Wind Power Electric Plants
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Life Cycle Analysis of Ecological Impacts of an Offshore and a Land-Based Wind Power Plant
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Comparison Analysis of Blade Life Cycles of Land-Based and Offshore Wind Power Plants
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Effect of mid-frequency discharge assistance on dual-high power impulse magnetron sputtering
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Computational investigations of acoustic radiation from end shields of small-power electric motor
PublikacjaW artykule omówiono rozwój metod modelowania własności akustycznych maszyn elektrycznych. Wskazano na pomijalny dotąd, znaczący udział drgań tarcz łożyskowych w emitowaniu hałasu przez silniki małej mocy. Na podstawie równania falowego potencjału prędkości wyprowadzono analityczne formuły do obliczeń akustycznych w polu bliskim tarczy łożyskowej. Zamieszczono uzyskane z serii obliczeń dla pracującego silnika, rozkłady ciśnienia...
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Cascaded doubly fed induction generator for mini and micro power plants connected to grid
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A hybrid, coupled reactors based 18-pulse diode rectifier with active power filter
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Comparative Evaluation of Multicoil Inductive Power Transfer Approaches Based on Z-source Network
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Spectral analysis of nonstationary low-frequency magnetic-field emissions from ship's power
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Design and Simulation Verification of Low Power Wireless Charging Battery System for Electric Bicycle
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Novel Inductive Power Transfer Approach Based on Z-Source Network with Compensation Circuit
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Shear-Jamming in Two-Dimensional Granular Materials with Power-Law Grain-Size Distribution
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Multicoil dynamic wireless power transfer topology with shared primary side compensation system
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Photovoltaic Maximum Power Point Technique based on Incremental Conductance (INCON) control algorithm
PublikacjaMaximum output power status can significantly improve the deployment rate of solar energy system. In order to get the maximum power output, issue of tracking maximum power point (MPP), reduced harmonics around MPP and improve efficiency of the solar power energy system, this paper presents the improved maximum power point tracking (MPPT) control...
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Contribution of Strength, Speed and Power Characteristics to Change of Direction Performance in Male Basketball Players
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Could graphene construct an effective conducting network in a high-power lithium ion battery?
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Method of Estimating Uncertainty as a Way to Evaluate Continuity Quality of Power Supply in Hospital Devices
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Assessment of damage due to earthquake-induced pounding between the main building and the stairway tower
PublikacjaRaporty po trzęsieniach ziemi pokazują, iż występujące podczas wstrząsów sejsmicznych zderzenia pomiędzy sąsiednimi konstrukcjami budowlanymi, lub ich częściami, mogą prowadzić do znacznych uszkodzeń lub nawet całkowitego zniszczenia konstrukcji. Celem niniejszego artykułu jest oszacowanie zakresu i intensywności zniszczeń na skutek zderzeń pomiędzy budynkiem głównym szpitala Olive View a wolnostojącą klatką schodową podczas trzęsienia...
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The Evaluation of Quality of the Co-Firing Process of Glycerine Fraction with Coal in the High Power Boiler
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Optimal Placement of Phasor Measurement Unit in Power System using Meta-Heuristic Algorithms
PublikacjaThe phasor measurement units (PMUs) play an important and vital role in power system monitoring and controlling, since they provide the power system phasors stamped with a common real time reference through a global positioning system (GPS). Indeed, from economical point of view it is not possible to set PMUs in all system buses due to the high cost and the requirement of more complex communication...
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Determination of Complex Permeability of Silicon Steel for Use in High-Frequency Modeling of Power Transformers
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Influence of the Phenomenon of Spectrum Leakage on the Evaluation Process of Metrological Properties of Power Quality Analyser
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Pipeline system for heat transportation from nuclear power plant — An optimizing approach
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Application of fourier series to determine the measurements error of harmonics with selected power quality analyzers
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The use of a static electrical energy meter as a transducer of active power to a pulse frequency signal
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Technical and economic conditions of supplying residential consumers with heat from nuclear power plant
PublikacjaThe reduction of CO2 emission requires technological shift towards carbon-free options. Cogeneration of electricity and heat based on coal and natural gas will experience generation cost increase, if the costs of emissions are imposed on the plant operators. Therefore, nuclear and renewable options should be considered. In this paper, we present the concept of electricity and heat supply system with nuclear condensing turbine adapted...
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Performance analysis of power swing blocking feature in ABB 670 series impedance relays
PublikacjaThis paper presents test results of a distance protection’s PSD power swing detection feature in ABB 670 series relays. A RED670 relay was tested, which is part of the hydroelectric set protection in Żarnowiec Pumped Storage Plant. The power swing blocking feature’s performance was analysed on the basis of the results of object tests made with an Omicron digital tester. Also presented are simulation results that illustrate the...
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A Combined TOPSIS and FA Based Strategic Analysis of Technical Condition of High Power Transformers
PublikacjaThe paper presents mathematical model { TOPSIS method, which was utilized on insulating state of distribution transformer to analyze and sensibility of individual measurements methods mutual comparison. We can uniquely determine the importance of these measurements methods with this mathematical appara- tus in these measurements methods in insulating state of transformers.
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Comparison of state feedback and PID control of pressurizer water level in nuclear power plant
PublikacjaThe pressurizer water level control system in nuclear power plant with pressurized water reactor (PWR) is responsible for coolant mass balance. The main control goal is to stabilize the water level at a reference value and to suppress the effect of time-varying disturbances (e.g. coolant leakage in primary circuit pipeline system). In the process of PWR power plant operation incorrect water level may disturb pressure control or...
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Case studies of resonance phenomena in high voltage overhead power lines with shunt reactors
PublikacjaMisguided design of the towers of power transmission lines can lead to serious problems such as voltage asymmetry, overvoltages, electric arc extinction difficulties or resonance – in case of double circuit line with shunt reactors. The paper points out those threats on example of 400 kV double circuit overhead transmission line with shunt reactors.
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Radioactivity of drilling cuttings from shale resources of the Lower Paleozoic Baltic Basin, Poland
PublikacjaFractionated drilling wastes originating from shale gas exploration in the Baltic Basin in Pomerania were subjected to the measurements of mean activity concentrations of naturally occurring radioactive materials (NORMs).To better understand rock structure and texture, the X-ray diffraction analysis (XRD) and scanning electron microscopy(SEM) observation were used. To compare activity concentration of radionuclides in bulk wastes...
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Operation of the 900 MW power plant with the ORC supplied from three heat sources
PublikacjaThe chapter is aimed at utilisation of waste heat in the reference supercritical power plant in the manner to produce electricity in ORC installation. The waste heat is available in the form of a stream of hot water at 90°C, recovered from the exhaust gases in the amount of 200MW. Such low enthalpy heat source is rather insufficient to produce a good quality vapour to feed the ORC turbine. Therefore an original approach to increase...
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Computer-aided Analysis of Induced Sheath Voltages in High Voltage Power Cable System
PublikacjaThis paper concerns the effect of configuration of high voltage power cables on induced voltages in their metallic sheaths. One, two or three cables per phase and phase sequence of the cables are considered. Computing of the voltages was performed for a normal operation and in case of earth fault. Various ways of the sheaths bonding are considered as well. Shock hazard and voltage stress of non-metallic outer sheath of cables are...
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Optimization of Nuclear Power Share in the Structure of Electricity Production in Poland in Time Perspective by 2060
PublikacjaThe author of this paper presented the results of a system analysis using MARKAL model, aiming at the optimization of nuclear power share in power generation structure in Poland in time perspective by 2060. Optimization criterion is the minimization of the objective function, i.e. the total cost of energy system, taking into account constraints related to CO2, SOx and NOx emissions and obligatory shares of electricity from renewable...
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Predictions of cutting power while sawing of birch and beech with the use of modern fracture mechanics
PublikacjaPraca zawiera wyniki badań eksperymentalnych procesu przecinania drewna brzozy i buka piłami o rzazie 2 mm na pilarce ramowej PRW15M. Na podstawie teoretycznego modelu Atkinsa, wyznaczono z danych eksperymentalnych stałe materiałowe (wiązkość i naprężenia tnące w strefie ścinania) i opracowano model do prognozowania mocy skrawania podczas przecinania drewna piłami na pilarce ramowej dla innych wartości rzazu w funkcji posuwu na...
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Analysis of inductive power transfer systems for variable air gap and voltage supply frequency
PublikacjaThe paper describes an IPT system, by which electrical energy may be transmitted through a large air gap between coils without electrical connection. It presents theoretical and simulation analysis of IPT, which allows for supplying a receiver in the conditions of slow, in relation to the dynamics of power supply, changes in dimension of the air gap. The influence of frequency characteristics of the system on the possible selection...
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Drawing conclusions about reliability of power systems from small number of statistical data
PublikacjaW artykule podjęto próbę udzielenia odpowiedzi na pytanie, czy możliwe jest wyciągnięcie przydatnych w praktyce wniosków o niezawodności elementów technicznych, wchodzących w skład systemów energetycznych, mając do dyspozycji nieliczne dane statystyczne. W opinii autora jest to możliwe. Wskazano dwie drogi postępowania. Pierwsza opiera się na wykorzystaniu metod statystycznych. Druga wykorzystuje elementy teorii zbiorów rozmytych.
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1.2V low-power four-quadrant CMOS transconductance multiplier operating in saturation region.
PublikacjaW pracy opisano niskomocową strukturę układową liniowego transkonduktancyjnego mnożnika czteroćwiartkowego pracującego w zakresie nasycenia. Układ analizowano z uwzględnieniem standardowego 0,35-mikrometrowego procesu CMOS. Przeprowadzone symulacje przy pomocy programu SPICE wykazały wysoką liniowość w odniesieniu do obu wejść sterujących X, Y. Np. dla sygnału harmonicznego 1 MHz; 0,3Vp-p na wejściu Y uzyskano zniekształcenia...
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Modeling of Electrified Transportation Systems Featuring Multiple Vehicles and Complex Power Supply Layout
PublikacjaThe paper proposes a novel approach to modeling electrified transportation systems. The proposed solution reflects the mechanical dynamics of vehicles as well as the distribution and losses of electric supply. Moreover, energy conversion losses between the mechanical and electrical subsystems and their bilateral influences are included. Such a complete model makes it possible to replicate, e.g., the impact of voltage drops on vehicle...
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Electrical Tree Growth Behavior Under AC and DC High Voltage in Power Cables
PublikacjaThis work investigates the impact of an applied AC and DC high voltage on the electrical tree behavior in extruded cross-linked polyethylene (XLPE) insulation based on simulation and experimental validation. Extensive partial discharge (PD) testing methods are being implemented for high voltage cables under AC voltage for monitoring their condition. However, these PD testing methods cannot be utilized for power cables under DC...
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A study of a compact high-efficiency zero-emission power plant with oxy-fuel combustion
PublikacjaThis paper discusses the application of global trends in gas cycles technology using oxy-fuel combustion. This is followed by a demonstration of a design solution for a new cycle with two enhanced energy-converting devices, namely a wet combustion chamber and a spray-ejector condenser. The proposed gas and steam cycle unit is contained within a single turbine, whose benefits combine those offered by gas turbines (high inlet temperatures)...
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Numerical investigation on dynamic response of a steel lattice tower under various seismic events
PublikacjaThe present paper presents the results of the numerical study designed to investigate the soil-structure flexibility effects on modal parameters (i.e. fundamental frequencies) and time-history analysis response (represented by the top relative displacements) of a 46.8 m high steel lattice tower subjected to a number of ground motions including also one mining tremor. In addition to the fixed-base condition, three different soil...
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Design of power cable lines partially exposed to direct solar radiation – special aspects
PublikacjaPower cable lines are usually buried in the ground. However, in some cases, their ending sections are mounted along the supports of overhead lines. This leads to a situation where the cables are exposed to direct solar radiation and, consequentially, overheat. The paper presents the advanced computer modelling of power cables’ heating, considering their insolation as well as the effect of wind. The temperature and current-carrying...
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Effect of pine impregnation and feed speed on sound level and cutting power in wood sawing
PublikacjaThe sound levels along with the cutting power registered during the sawing process of the impregnated and non-impregnated pine wood at two feed speeds are shown and compared in this paper. Statistically significant differences in the acoustic signals occurred at the lower feed rate. The differences became smaller with an increase in the feed speed. In contrast to the sound signal, the differences...
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Evaluation of VSC Impact on Power System Using Adequate P-Q Capability Curve
PublikacjaRenewable energy sources, which are becoming increasingly popular, often use a voltage source converter (VSC) for connection to the power system. Assessing the effects of connecting such a source to the power system is essential to ensure the proper operation of the power system and the connected source. For this purpose, it is necessary to know the range of active and reactive power generation by the converter. The authors indicate...
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Development of a spray-ejector condenser for the use in a negative CO2 emission gas power plant
PublikacjaOne promising solution for developing low-emission power technologies is using gaseous fuel combustion in pure oxygen when the exhaust gas mixture is composed of H2O and CO2, and where CO2 is separated after steam condensation. The paper presents the results of computational analyses providing to the Spray-Ejector Condenser (SEC) development, which is one of the crucial components of the negative CO2 gas power plant (nCO2PP) cycle...
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ANALYSIS OF THE FEATURES OF EFFECTIVE IMPLEMENTATION OF SOLAR POWER PLANTS IN LOCAL ENERGY SUPPLY SYSTEMS
PublikacjaПоказано, що відновлені джерела енергії (ВДЕ) у багатьох країнах дедалі більше домінують на ринку електроенергії, при цьому обсяги генерації електроенергії сонячними електростанціями (СЕС) останніми роками зростають рекордними темпами. Зазначено, що хоча частка ВДЕ продовжує зростати і фотоелектрична індустрія стрімко розвивається, однак галузь все ще стикається з багатьма проблемами, зокрема як продовжувати знижувати нормовану...
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Complementary studies of residual stress distribution of repaired power plant steam turbine casing
PublikacjaRozkład i poziom naprężeń własnych w korpusach turbin badano za pomocą efektu Barkhausena oraz metodą nawiercania otworów. Badano również twardość. Korpusy były reperowane metodą zaspawania. Wykazano, iż zastosowana technologia nie wprowadza naprężeń o poziomie zagrażającym dalszej ekploatacji korpusu.
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Possibility of exact determination of thermal and flow degradation symptoms in on-line power objects diagnostics
PublikacjaPrzedyskutowano problem dokładności tworzenia symptomów degradacji dotyczących sprawności urządzeń składowych dużych obiektów energetycznych. W referacie zajęto się szczególnie metodami tworzenia wzorców sprawnej pracy w przypadku określania sprawności w układzie on-line i porównano ją z określeniem w systemie off-line. Do odtwarzania stanu referencyjnego zastosowano sieć neuronową statystyczną (SSN, ang. ANN) o nieskokowych funkcjach...