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    Wyświetlanie 1-11 z 11
    Tytuł:
    Reduction of the step voltages of MV/LV substation grounding system based on shaping electric field
    Autorzy:
    Sikora, Roman
    Markiewicz, Przemysław
    Powiązania:
    https://bibliotekanauki.pl/articles/1841172.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    grounding system
    step voltage
    touch voltage
    IEEE 80-2013 standard
    system uziemiający
    napięcie krokowe
    napięcie dotykowe
    Standard IEEE 80-2013
    Opis:
    The article presents the analysis results of the effectiveness limitation of the step voltage by forming an electric field on the ground surface. For shaping the electric field, a method consisting of screens placed around the point of the earth current flow was used. The analysis was performed using an example of an MV/LV substation grounding system. This research was conducted applying a mathematical model of the grounding system and screens by means of the finite element method. The influence of metal, insulating screens and surface material on the step/touch voltage values for the considered grounding system was estimated. Most of the methods described can be applied in practice. In the opinion of the authors, the method of using screens made of insulating and conductive materials has not been sufficiently described in the literature. Moreover, in the available literature there is no in-depth analysis of the described electric field shaping methods.
    Źródło:
    Archives of Electrical Engineering; 2021, 70, 3; 601-613
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Problems and counter measures of arc suppression coilin 10 kV distribution system
    Autorzy:
    Ni, Hui
    Ding, Pei
    Ma, Yunlong
    Ai, Shaogui
    Ma, Feiyue
    Zhang, Qingping
    Powiązania:
    https://bibliotekanauki.pl/articles/141485.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    arc suppression coil
    capacitive current
    artificial grounding fault test
    neutral non-effective grounding system
    Opis:
    The arc suppression coil determines whether it can effectively extinguish the arc when it is grounded in the neutral non-effective grounding system. An artificial grounding test is an importantway to verify its performance. In this study, 13 substations with the 10 kV system in the Ningxia areawere selected and considered. Based on the artificial single-phase grounding test, the residual current, the compensation current and the off-resonance degree were measured in the arc suppression coil, and the performance of the arc suppression coil in the 10 kV system was verified. The experimental results show that the error of arc suppression coil automatic measurement is large, the off-resonance degree is large, the resistive component in the compensation current is excessive, the harmonic component exists in the compensating current and capacitive current. To solve these problems, this paper puts forward the corresponding countermeasures for reference.
    Źródło:
    Archives of Electrical Engineering; 2019, 68, 1; 135-146
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of the effectiveness of lightning and surge protection in a large solar farm
    Autorzy:
    Sobolewski, Konrad
    Sobieska, Emilia
    Powiązania:
    https://bibliotekanauki.pl/articles/2086693.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    ANSYS simulations
    electric safety
    grounding system
    magnetic field distribution
    lightning modeling
    lightning protection
    photovoltaic power plant
    Opis:
    The aim of the considerations presented in the article was a stand-alone groundbased photovoltaic power plant. The article is devoted to the qualitative analysis of some lightning protection configurations. These types of constructions often require an individual look at the design and execution of lightning protection installations, which causes problems with the selection of optimal solutions. These problems relate primarily to the way the lightning rods are arranged to create protection zones, but also to the way they are attached: to the supporting structure for PV modules or as free-standing. Another problem raised in the article is the way how lightning current is discharged from rods to the ground and how it is dispersed there. Due to the vast area of such facilities and the requirements for electrical safety, it is necessary to consider and design a ground system with optimal electrical parameters, but also technical and economic ones. All these elements have their impact on the value of voltages induced in the electrical installation, which is also presented in the content of the article as the magnetic field distribution and calculation of induced voltages in an exemplary configuration. Finally, this article will compare described technical solutions encountered in selecting the best protection method for this type of photovoltaic installation.
    Źródło:
    Archives of Electrical Engineering; 2022, 71, 2; 523--542
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation on electrically conductive aggregates as grounding compound produced by Marconite
    Autorzy:
    Mohd Tadza, Mohd Yuhyi
    Tengku Anuar, Tengku Hafidatul Husna
    Mat Yahaya, Fadzil
    Powiązania:
    https://bibliotekanauki.pl/articles/396152.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    grounding system
    conductive aggregate
    Marconite
    ground enhancement material
    resistivity
    grounding compound
    system uziemienia
    kruszywo przewodzące
    materiał uszlachetniający
    oporność
    masa uziemiająca
    Opis:
    Marconite is often used as alternative material to improve the performance of earth grounding system. This study aims to investigate of the physical and mechanical behaviour of conductive aggregate derived from Marconite namely, the electrical resistivity, water absorption, and crushing strength. In addition, similar tests were also conducted on mortar aggregate for comparison. The resistivity of aggregates were measured using soil box method. Test results showed that the electrical resistivity, water absorption, and crushing strength of both aggregates varied with time. These values were found to be stabilised after approximately after 14 days. The electrical resistivity for aggregates containing Marconite were found to be 39.2 Ω.m, far lower than 12700 Ω.m obtained for mortar-based aggregates. Similarly, the water absorption for Marconite aggregates were greater compared to mortar aggregates. On the other hand, the crushing strength for Marconite aggregates was to be lower. Incorporating Marconite significantly improved the electrical resistivity behaviour while maintaining acceptable mechanical properties crucial for electrical grounding purposes.
    Źródło:
    Civil and Environmental Engineering Reports; 2019, 29, 3; 86-96
    2080-5187
    2450-8594
    Pojawia się w:
    Civil and Environmental Engineering Reports
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Obosnovanie parametrov sistem kormoobespechenija molochnykh ferm
    Grounding of the parameters of system of dairy farms feed supply
    Autorzy:
    Тrihuba, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/77561.pdf
    Data publikacji:
    2015
    Wydawca:
    Komisja Motoryzacji i Energetyki Rolnictwa
    Tematy:
    dairy farm
    feed supply
    parameter
    technical equipment
    technological process
    logistic process
    Źródło:
    Motrol. Motoryzacja i Energetyka Rolnictwa; 2015, 17, 4
    1730-8658
    Pojawia się w:
    Motrol. Motoryzacja i Energetyka Rolnictwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Obosnovanie ehtapov sistemnogo issledovanija processov upravlenija konfiguraciejj proektov sistem podderzhki prinjatija reshenijj v polevodstve
    Grounding of stages of system research of processes for the management by project configuration of decision support systems in the field husbandry
    Autorzy:
    Sivakovskaja, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/77163.pdf
    Data publikacji:
    2015
    Wydawca:
    Komisja Motoryzacji i Energetyki Rolnictwa
    Tematy:
    decision support system
    project management
    configuration
    systemic approach
    induction
    Źródło:
    Motrol. Motoryzacja i Energetyka Rolnictwa; 2015, 17, 7
    1730-8658
    Pojawia się w:
    Motrol. Motoryzacja i Energetyka Rolnictwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of the neutral grounding modes influence on the reliability characteristics of local systems with renewable energy sources
    Autorzy:
    Ostapchuk, Oleksandr
    Kuznetsov, Valeriy
    Kruczek, Włodzimierz
    Kuznetsov, Vitaliy
    Tsyplenkov, Dmytro
    Powiązania:
    https://bibliotekanauki.pl/articles/1840882.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
    Tematy:
    electric networks
    protection
    reliability
    ground failure current
    electrical safety
    system with isolated neutral
    system with resonant grounding
    system with low-impedance neutral grounding
    sieć elektryczna
    ochrona
    niezawodność
    bezpieczeństwo
    Opis:
    When comparing the performance indicators of electrical networks with different types of neutral grounding, along with the fulfilment of the requirement to ensure reliability of power supply to consumers, serious attention is drawn to the main network parameters influencing the performance of power supply systems. Analysis of research and its results, reported above, on the influence of the neutral ground of power networks on the reliability and electrical safety conditions of the power supply systems as a whole, on the damage of distribution networks and electrical equipment as well as on the working capacity of relay protection devices, provides an opportunity to estimate each specific operation mode of the neutral and to develop recommendations aimed at strengthening the positive indicators of the corresponding modes. Other things being equal, reliability of power supply to electrical receivers or reliability of distribution networks is mainly determined by the damage to network elements and the performance of relay protection devices. The degree of influence of these factors on the reliability of distribution networks depends on the neutral mode, which in turn determines the level of internal overvoltages and the nature of transient processes at earth fault.
    Źródło:
    Diagnostyka; 2021, 22, 1; 45-56
    1641-6414
    2449-5220
    Pojawia się w:
    Diagnostyka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Semantics and symbol grounding in Turing machine processes
    Autorzy:
    Sarosiek, Anna
    Powiązania:
    https://bibliotekanauki.pl/articles/429109.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Papieski Jana Pawła II w Krakowie
    Tematy:
    Steven Harnad
    symbolic system
    semantic system
    symbol grounding problem
    Turing machine
    Turing test
    Church-Turing Thesis
    artificial intelligent
    cognition
    Opis:
    The aim of the paper is to present the underlying reason of the unsolved symbolgrounding problem. The Church-Turing Thesis states that a physical problem,for which there is an algorithm of solution, can be solved by a Turingmachine, but machine operations neglect the semantic relationship betweensymbols and their meaning. Symbols are objects that are manipulated on rulesbased on their shapes. The computations are independent of the context, mentalstates, emotions, or feelings. The symbol processing operations are interpretedby the machine in a way quite different from the cognitive processes.Cognitive activities of living organisms and computation differ from each other,because of the way they act in the real word. The result is the problem ofmutual understanding of symbol grounding.
    Źródło:
    Semina Scientiarum; 2017, 16
    1644-3365
    Pojawia się w:
    Semina Scientiarum
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Monitoring system of extreme loadings of propulsion system’s foundation : design assumptions
    Autorzy:
    Kyzioł, L.
    Murawski, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/242588.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    marine structural health monitoring
    propulsion system diagnostic
    marine engines’ foundations
    underwater explosion
    ship grounding
    optical time-domain reflectometer
    Fibre Bragg Grating
    Opis:
    Project of on-line diagnostic (monitoring) system of marine propulsion system working parameters is the authors' general target. Proper propulsion system’s foundation is one of the most important parameters for its reliable operation. Different types of quasi-static loadings and dynamic excitations can be observed during ships exploitation. Presented research has been limited to extreme loadings. Underwater explosions or ship groundings are considered examples of extreme foundation loadings. Analysis of the physical parameters of the extreme forces has been presented in the first part of the paper. Water pressure spatial and non-spatial (time) distribution during underwater explosion has been analysed as an example. Short overview of the dynamic mathematical models of underwater explosions is presented. Time function of vibrations acceleration of ship construction is important design assumption of planned Structural Health Monitoring (SHM) system. Propulsion system's foundation loading measurements should take into account general ship hull deformation (in the aft part of the ship) as well as reactions changes of main engine and shaft line bearings. Ship hull deformation should be monitored as quasi-continuous measurements, along whole propulsion system. Optical Time-Domain Reflectometer method (OTDR) is planned for hull deformation monitoring. Propulsion system bearings' reactions are a source of local foundation pads' strain changes. Fibre Bragg Grating (FBG) sensors are the best for that kind of measurements, in authors opinion. Both techniques (OTDR and FBG) have been shortly described in the paper. Scheme of monitoring system of marine propulsion systems foundation's loadings are proposed in the end of the article.
    Źródło:
    Journal of KONES; 2013, 20, 1; 155-162
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Grounding of the frequency range choice in the system of monitoring of the operation reliability of the technical systems
    Obosnovanie vybora chastotnogo diapozona v sisteme kontrolja operativnojj nadezhnosti tekhnicheskikh sistem
    Autorzy:
    Marchenko, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/793741.pdf
    Data publikacji:
    2012
    Wydawca:
    Komisja Motoryzacji i Energetyki Rolnictwa
    Tematy:
    monitoring
    operation reliability
    technical system
    cluster
    statistical method
    corrosion
    erosion
    dispersion
    crack
    methodology
    Opis:
    There grounded the frequency range choice in the system of the operation reliability of the technical systems based on the application of probabilistic – statistical method.
    Обоснован выбор частотного диапазона в системе оперативной надежности технических систем, основанный на приложении вероятностно- статистического метода.
    Źródło:
    Teka Komisji Motoryzacji i Energetyki Rolnictwa; 2012, 12, 3
    1641-7739
    Pojawia się w:
    Teka Komisji Motoryzacji i Energetyki Rolnictwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Metod obosnovanija racional'nykh parametrov sistem predvaritel'nojj ochistki zerna
    Method of the grounding the rational parameters of systems for the precleaning of grain
    Autorzy:
    Sydorchuk, A.
    Skibchyk, V.
    Dnes, V.
    Sydorchuk, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/78183.pdf
    Data publikacji:
    2015
    Wydawca:
    Komisja Motoryzacji i Energetyki Rolnictwa
    Tematy:
    grain processing
    grain cleaning
    harvesting system
    transport system
    structural analysis
    rational parameter
    statistical modelling
    Źródło:
    Motrol. Motoryzacja i Energetyka Rolnictwa; 2015, 17, 7
    1730-8658
    Pojawia się w:
    Motrol. Motoryzacja i Energetyka Rolnictwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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