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    Wyświetlanie 1-11 z 11
    Tytuł:
    Short-Circuit Current Contribution from Large Scale PV Power Plant in the Context of Distribution Power System Protection
    Autorzy:
    Bejmert, D.
    Sidhu, T. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/410525.pdf
    Data publikacji:
    2012
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    grid-connected PV power plant
    transient analysis
    fault contribution
    overcurrent protection
    Opis:
    The interconnection of distributed generators (DG) to existing network may give rise to many technical problems. To ensure appropriate power quality and stability of the grid these problems should be recognized and solved. For this purpose, behaviour of such energy sources, under various disturbances, must be studied and known to the distribution grid operators. In this paper fault current contribution from large scale photovoltaic (PV) power plant as well as protection issues concerning such DGs are discussed. The mentioned problems were investigated in PSCAD model of 50 MW grid--connected PV power plant where various operating condition of the network and penetration levels of PV were considered.
    Źródło:
    Present Problems of Power System Control; 2012, 2; 85-96
    2084-2201
    Pojawia się w:
    Present Problems of Power System Control
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Finding short-circuit current time based on raw data
    Autorzy:
    Książkiewicz, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/376962.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    overcurrent
    Scilab
    histogram
    short-circuit time
    Opis:
    Series of tests were conducted in which short-circuit current was registered. Four different overcurrent protection devices were used for a set value of prospective current. Based on obtained data the short-circuit time was calculated. In order to obtain this information a procedure was developed. Later it was implemented with the help of numerical computation software Scilab. In this paper results of calculations, the procedure itself and its implementation are presented.
    Źródło:
    Poznan University of Technology Academic Journals. Electrical Engineering; 2015, 82; 213-218
    1897-0737
    Pojawia się w:
    Poznan University of Technology Academic Journals. Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Warunki pracy wyłączników średniego napięcia w układach kompensacji mocy biernej
    Operating conditions of medium voltage switches used in reactive power compensation systems
    Autorzy:
    Kulas, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/185970.pdf
    Data publikacji:
    2009
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Technik Innowacyjnych EMAG
    Tematy:
    ograniczenia przetężeń prądowych
    przetężenia prądowe
    układ kompensacji mocy biernej
    limitations of overcurrent
    overcurrent
    reactive power compensation system
    Opis:
    Łączenie pojemności baterii kondensatorów wywołuje stany przejściowe w danym obwodzie, prowadzące do znacznych przetężeń prądowych oraz przepięć, zarówno przy załączaniu jak i przy ich wyłączaniu baterii kondensatorów, linii kablowych i napowietrznych. Wyłączaniu prądów pojemnościowych towarzyszą znaczne wartości chwilowe napięć międzystykowych łącznika, co może być przyczyną występowania pomiędzy stykami wyłącznika zapłonów ponownych późnych. Załączanie pojemności wywołuje na ogół znaczne przetężenia prądowe w danym obwodzie. Mogą być one przyczyną uszkodzenia kondensatorów załączanej baterii kondensatorów, lub powodować sczepienia się styków łącznia elektrycznego. Przetężenia prądowe oraz sposoby ich ograniczania występujące w takich układach są przedmiotem referatu.
    Connecting capacitances of capacitor batteries causes transient states in a given circuit leading to significant overcurrent and overvoltage in both cases i.e. at switching on an off of batteries in cable and open-wire lines. Switching off capacitance currents is accompanied by high actual values of contact potential difference which may cause late reignitions between contacts of switches. Connection of capacitance generates usually significant overcurrent in a given circuit. This may be a reason of failures in capacitors of a capacitance battery being connected or may cause contact tacking in electric switches. The issues of overcurrent and methods of its limitation in such electric circuits are subject matter of this paper.
    Źródło:
    Mechanizacja i Automatyzacja Górnictwa; 2009, R. 47, nr 7, 7; 57-62
    0208-7448
    Pojawia się w:
    Mechanizacja i Automatyzacja Górnictwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimization Of Current Magnitude Estimators Based On Marquardt-Levenberg Algorithm
    Autorzy:
    Łukowicz, M.
    Solak, K.
    Wicher, P.
    Wiecha, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/410595.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    signal processing
    digital filter
    magnitude estimator
    high speed overcurrent relay
    Opis:
    Digital filtering, correlation methods, time delay methods, signal differentiation are the most commonly used methods of estimating fundamental frequency orthogonal components utilized in magnitude estimators. The foundation for designing filters used in aforementioned methods are usually demanded frequency responses or signal models with their parameters to be estimated. A weak point of both approaches is frequency-domain modelling ignoring time-domain performance of the magnitude estimators. In order to fulfil the requirements of protection with the optimum speed for many different configurations, operating conditions and construction features of power systems, it is necessaiy to develop magnitude estimator design methods aimed at modelling with respect to highspeed response with simultaneous acceptable estimation accuracy in the steady state. The article discusses the implementation of Levenberg-Marquardt algorithm to optimization of current magnitude estimators designed for power system protection with the focus on estimators used in instantaneous overcurrent relays. The paper presents details of optimizing algorithm, power system model used for acquisition of signal patterns and estimator performance analyzes.
    Źródło:
    Present Problems of Power System Control; 2016, 7; 5-17
    2084-2201
    Pojawia się w:
    Present Problems of Power System Control
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Układ do testowania prądu rozruchu źródeł napięcia przemiennego
    Device for the test of the overcurrent starting of the AC power supplies
    Autorzy:
    Neska, M.
    Gospodarczyk, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/257080.pdf
    Data publikacji:
    2008
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Technologii Eksploatacji - Państwowy Instytut Badawczy
    Tematy:
    impuls przetężenia prądu
    prąd rozruchu
    tyrystor wyzwalający
    źródło napięcia przemiennego
    overcurrent pulse
    current starting
    trigger thyristor
    AC power supply
    Opis:
    W artykule przedstawiono opracowany i wykonany układ do testowania prądu rozruchu źródeł napięcia przemiennego. Urządzenie umożliwia pomiar impulsowego prądu przetężenia (szczytowy prąd rozruchu) źródeł przemiennego prądu elektrycznego o napięciu do 700VAC, przy wyzwalaniu w zakresie kąta fazowego 0-360°, a tym samym określenie przeciążalności danego zasilacza AC według zaleceń normy PN-EN-61000-4-11. Zastosowana metoda sterowania wyzwalaniem bramkowym tyrystora pozwala uzyskiwać krótkie czasy impulsów prądu bramki, tym samym odciążając bramkę.
    The article presents the device for the test of the overcurrent starting of the AC power supplies, which was designed and made by the authors. The system allows measuring the overcurrent pulse of the AC power supplies with voltages up to 700VAC. The overcurrent pulse is triggered by applying a trigger thyristor for the phase angles from 0 to 360°, and it allows defining an overload of AC power supply according to PN-EN-61000-4-11 standard. The control system of the device allows the triggering of the thyristor by the short length pulses, thereby, unloading the thyristor gate during the trigger.
    Źródło:
    Problemy Eksploatacji; 2008, 3; 197-204
    1232-9312
    Pojawia się w:
    Problemy Eksploatacji
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Selected protective algorithms of modern IED
    Autorzy:
    Olejnik, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/97563.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    IED
    protection algorithms
    IDMT overcurrent protection
    admittance protection
    Opis:
    The paper presents some aspects of the work IED protection algorithms. These functions are hidden deep in the algorithms, however, very important for the power protection automation during abnormal failure in the MV lines. These functions have not been tested yet. An example of this problem is action of the IDMT overcurrent protection when the input current changes its value after protection start-up. Another example is the work of an earth fault protection based on Y0> criteria, when Y0 signal is distorted. The article is entirely based on the experience and measurements conducted by the author in the laboratories of the Institute of Electrical Power Engineering Poznań University of Technology.
    Źródło:
    Computer Applications in Electrical Engineering; 2013, 11; 389-395
    1508-4248
    Pojawia się w:
    Computer Applications in Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    High impedance fault detection in radial distribution network using discrete wavelet transform technique
    Autorzy:
    Suliman, Mohammed Yahya
    Alkhayyat, Mahmood Taha
    Powiązania:
    https://bibliotekanauki.pl/articles/1955195.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    high impedance fault
    HIF
    multiresolution analysis
    MRA
    overcurrent relays
    discrete wavelet transform
    DWT
    uszkodzenie o wysokiej impedancji
    analiza wielorozdzielcza
    przekaźniki nadprądowe
    dyskretna transformata falkowa
    Opis:
    Detecting high impedance faults (HIFs) is one of the challenging issues for electrical engineers. This type of fault occurs often when one of the overhead conductors is downed and makes contact with the ground, causing a high-voltage conductor to be within the reach of personnel. As the wavelet transform (WT) technique is a powerful tool for transient analysis of fault signals and gives information both on the time domain and frequency domain, this technique has been considered for an unconventional fault like high impedance fault. This paper presents a new technique that utilizes the features of energy contents in detail coefficients (D4 and D5) from the extracted current signal using a discrete wavelet transform in the multiresolution analysis (MRA). The adaptive neurofuzzy inference system (ANFIS) is utilized as a machine learning technique to discriminate HIF from other transient phenomena such as capacitor or load switching, the new protection designed scheme is fully analyzed using MATLAB feeding practical fault data. Simulation studies reveal that the proposed protection is able to detect HIFs in a distribution network with high reliability and can successfully differentiate high impedance faults from other transients.
    Źródło:
    Archives of Electrical Engineering; 2021, 70, 4; 873-886
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of transients in multiple power filter circuit comprising C-type filter
    Autorzy:
    Warecki, J.
    Gajdzica, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/377600.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    capacitor
    reactor
    C–type filter
    single-tuned passive filter
    switching transient
    transient overvoltage
    transient overcurrent
    Opis:
    Passive filters are widely used to mitigate the effect of load harmonics on the supply power grid. Topology selection of the filters is based on the frequency bandwidth to be suppressed. Filter topologies comprising single-tuned filters and damped filters are the most popular in industrial power system applications. The article focuses on the influence of the damped C-type 2nd harmonic filter on the transients behavior under arc transformer energization in the arc furnace power supply system compensated by SVC. The examination results of transient currents and voltages across capacitors and reactors of the 3rd and 5th passive filters are compared for two topologies of the SVC filter circuits: with and without C-type filter. The Matlab/Simulink Software was used to modeling filter behavior during unload transformer switching-on.
    Źródło:
    Poznan University of Technology Academic Journals. Electrical Engineering; 2018, 95; 105-115
    1897-0737
    Pojawia się w:
    Poznan University of Technology Academic Journals. Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Transients impact on power filter circuit sizing
    Autorzy:
    Warecki, J.
    Gajdzica, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/97523.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    capacitor
    reactor
    harmonic filter
    transient and dynamic overvoltage
    transient and dynamic overcurrent
    equipment ratings
    Opis:
    The practice of operating multiple single-tuned filters in AC electrical arc furnace power supply systems has shown, that frequent energizing unloaded furnace transformer can cause damage of the filters. To examination of supply and filter system configuration impact on switching transient and dynamic overvoltages and overcurrents, an example of 50 MVA arc furnace unit was chosen. The transient analysis has been carried out by simulating within Matlab/Simulink Software. Using ANSI/IEEE Standards paper focuses on the selections of ratings for capacitors and air-core reactors used in multiple single-tuned harmonic filters configurations. Comparison of filter reactor and capacitor bank design based on steady state operation and transformer energizing was shown.
    Źródło:
    Computer Applications in Electrical Engineering; 2015, 13; 111-119
    1508-4248
    Pojawia się w:
    Computer Applications in Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Transients under energizing multiple power filter circuits
    Autorzy:
    Warecki, J.
    Gajdzica, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/97327.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    capacitor
    reactor
    harmonic filter
    C–type filter
    Static Var Compensator
    transient overcurrent
    transient overvoltage
    dynamic overcurrent
    dynamic overvoltage
    switching transients
    Opis:
    The practice of operating reactive power compensation systems involving passive multiple filter circuits (FC) configured by single–tuned filters has shown, that it’s energizing can cause damage of the filter components. Impact of feasible FC configurations, including FC with a C–type filter, on switching overvoltages and overcurrents under the harmonic filters energizing were analyzed. Influence of the filters tuning on transient behavior has been shown. The transient analysis has been carried out by simulating of the FC within Matlab/Simulink software.
    Źródło:
    Computer Applications in Electrical Engineering; 2016, 14; 89-100
    1508-4248
    Pojawia się w:
    Computer Applications in Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of the converter transformer valve-side bushing fault on commutation reactance protection and improvement scheme
    Autorzy:
    Zhang, Yanxia
    Dong, Guanghao
    Wei, Le
    Ma, Jinting
    Du, Shanshan
    Powiązania:
    https://bibliotekanauki.pl/articles/27309943.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    commutation reactance
    converter transformer
    improvement scheme
    overcurrent protection
    valve-side bushing fault
    VSC HVDC system
    Opis:
    Commutation reactance is an important component in the voltage-source converter-based high-voltage direct current (VSC–HVDC) transmission system. Due to its connection to the converter, when there is a fault occurring on the valve-side bushing of a converter transformer, the nonlinearity operation of the converter complicates the characteristics of current flowing through commutation reactance, which may lead to maloperation of its overcurrent protection. It is of great significance to study the performance of commutation reactance overcurrent protection under this fault condition and propose corresponding improvement measures to ensure the safe and stable operation of AC and DC systems. In the VSC–HVDC system with the pseudo-bipolar structure of a three-phase two-level voltage source converter, the valve has six working periods in a power frequency cycle, and each period is divided into five working states. According to the difference between the fault phase and non-fault phase of the conductive bridge arms at the time of fault occurrence, these five working states are merged into two categories. On this basis, various faults of the valve-side bushing of a converter transformer are analyzed, and the conclusion is drawn that the asymmetric fault of valve-side bushing can lead to the maloperation of the commutation reactance overcurrent protection. Based on the characteristics that the current flowing through the commutation reactance after the asymmetric fault of the valve-side bushing contains decaying aperiodic components in addition to the fundamental frequency wave, a scheme to prevent the maloperation of commutation reactance overcurrent protection is proposed, which uses the unequal of two half cycle integral values with different starting points to realize the blocking of commutation reactance overcurrent protection, and it makes up the deficiency of existing protection in this aspect. Finally, this paper builds a VSC–HVDC system simulation model in the PSCAD/EMTDC platform to verify the effectiveness of the scheme.
    Źródło:
    Archives of Electrical Engineering; 2023, 72, 3; 715--735
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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