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    Tytuł:
    Rasčët toka dvuhfaznogo korotkogo zamykaniâ na zemlû sučëtom harakteristik zazemleniâ oborudovaniâ
    Calculation of two-phase ground fault current with consideration of equipment grounding specifications
    Autorzy:
    Kosjakow, A.
    Suhoguzow, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/312527.pdf
    Data publikacji:
    2018
    Wydawca:
    Instytut Naukowo-Wydawniczy "SPATIUM"
    Tematy:
    prąd zwarciowy
    przewód uziemiający
    rezystancja uziemienia
    rezystancja połączenia metalowego
    opór cieplny
    ground fault current
    grounding electrode
    grounding resistance
    metal connection
    thermal resistance
    Opis:
    V statʹe opisany sposoby rasčëta toka dvuhfaznogo korotkogo zamykaniâ na zemlû v èlektričeskih setâh s izolirovannoj nejtralʹû dlâ celej ocenki termičeskoj stojkosti zazemlâûŝih provodnikov i zazemlite učityvaûŝie harakteristiki zazemleniâ oborudovaniâ – soprotivlenie zazemlâûŝego ustrojstva i soprotivlenie metallosvâzi oborudovaniâ s zazemlâûŝim ustrojstvom. Vyvedeny novye formuly dlâ rasčëta tokov dvuhfaznogo korotkogo zamykaniâ na zemlû i opredelena ih oblastʹprimeneniâ.
    The article describes ways of calculating two-phase ground fault current in electrical networks with isolated neutral for needs of calculating thermal resistance in equipment's grounding elements. Grounding resistance and metal resistance of high-voltage equipment are added to the existing methods of short circuit currents calculation.
    Źródło:
    Autobusy : technika, eksploatacja, systemy transportowe; 2018, 19, 12; 468-473
    1509-5878
    2450-7725
    Pojawia się w:
    Autobusy : technika, eksploatacja, systemy transportowe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Quick-response protection system against electric shock in distributed generation systems
    Autorzy:
    Shkrabets, Fedir
    Plaksin, Sergej
    Ostapchuk, Oleksandr
    Kuznetsov, Valeriy
    Tymchenko, Irina
    Muntian, Antonina
    Powiązania:
    https://bibliotekanauki.pl/articles/1840853.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
    Tematy:
    electric networks
    protection
    reliability
    ground fault current
    electrical safety
    protection against electric shock
    signal processing system
    analog filtering
    sieci elektryczne
    ochrona
    niezawodność
    bezpieczeństwo elektryczne
    ochrona przeciwporażeniowa
    system przetwarzania sygnału
    filtracja analogowa
    Opis:
    The peculiarities of the operation of distributed generation systems lead to a change in the requirements for the reliability and safety of the power distribution systems in which they are integrated. To meet the increased requirements, continuous monitoring of the insulation parameters (active resistance and capacitance to ground) is often used with operating artificial non-industrial frequency operational signals introduced into the network. In the case of a sudden touch, such a system is not effective, since the response time of the protection device, which consists of the signal processing time and the operating of the actuator, is crucially important. For the used operational signals with a frequency of 100 and 200 Hz, the processing time using the Fourier transform is 10 ms for 100 Hz and 5 ms for 200 Hz. Considering that the response time of the fastest actuators (based on vacuum switches) is from 3 to 7 ms, this is a rather significant period of time. To develop an effective resolver system, the capabilities of the Matlab environment were used to determine the most successful design of an analog prototype (Butterworth, Bessel, Chebyshev and Cauer of 6th order) for an operational signal with a frequency of 200 Hz. As a result, the processing time was established, which varies widely from 3.5 to 19 ms. Taking into account the known indicators, namely the frequency and number of operational signals, a signal processing system was developed using the vector-matrix analysis method. As a result of modeling the processing characteristics of functional signals (at a sampling rate of 1 kHz), the system quick-response was 3 ms, with the possibility of its further decrease as its productiveness increases.
    Źródło:
    Diagnostyka; 2021, 22, 3; 59-65
    1641-6414
    2449-5220
    Pojawia się w:
    Diagnostyka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Quick-response protection system against electric shock in distributed generation systems
    Autorzy:
    Shkrabets, Fedir
    Plaksin, Sergej
    Ostapchuk, Oleksandr
    Kuznetsov, Valeriy
    Tymchenko, Irina
    Muntian, Antonina
    Powiązania:
    https://bibliotekanauki.pl/articles/1840876.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
    Tematy:
    electric networks
    protection
    reliability
    ground fault current
    electrical safety
    protection against electric shock
    signal processing system
    analog filtering
    sieci elektryczne
    ochrona
    niezawodność
    bezpieczeństwo elektryczne
    ochrona przeciwporażeniowa
    system przetwarzania sygnału
    filtracja analogowa
    Opis:
    The peculiarities of the operation of distributed generation systems lead to a change in the requirements for the reliability and safety of the power distribution systems in which they are integrated. To meet the increased requirements, continuous monitoring of the insulation parameters (active resistance and capacitance to ground) is often used with operating artificial non-industrial frequency operational signals introduced into the network. In the case of a sudden touch, such a system is not effective, since the response time of the protection device, which consists of the signal processing time and the operating of the actuator, is crucially important. For the used operational signals with a frequency of 100 and 200 Hz, the processing time using the Fourier transform is 10 ms for 100 Hz and 5 ms for 200 Hz. Considering that the response time of the fastest actuators (based on vacuum switches) is from 3 to 7 ms, this is a rather significant period of time. To develop an effective resolver system, the capabilities of the Matlab environment were used to determine the most successful design of an analog prototype (Butterworth, Bessel, Chebyshev and Cauer of 6th order) for an operational signal with a frequency of 200 Hz. As a result, the processing time was established, which varies widely from 3.5 to 19 ms. Taking into account the known indicators, namely the frequency and number of operational signals, a signal processing system was developed using the vector-matrix analysis method. As a result of modeling the processing characteristics of functional signals (at a sampling rate of 1 kHz), the system quick-response was 3 ms, with the possibility of its further decrease as its productiveness increases.
    Źródło:
    Diagnostyka; 2021, 22, 3; 59-65
    1641-6414
    2449-5220
    Pojawia się w:
    Diagnostyka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Frequency Response Testing of Zero-Sequence Current Transformers for Mining Ground Fault Protection Relays
    Autorzy:
    Kuliński, Krzysztof
    Heyduk, Adam
    Powiązania:
    https://bibliotekanauki.pl/articles/1844476.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    zero-sequence current transformers
    ground-fault protection relays
    frequency response
    Opis:
    In Polish coal mining, medium voltage power distribution networks operate with an insulated neutral point. Zero-sequence current transformers are the basic sensors that generate input signals for earth-fault protection relays. In the literature, the problem of frequency response analysis of various types of current transformers has been examined many times, e.g. [1] [2], but not for zero-sequence current transformers so far. As part of the work, two types of zero-sequence current transformers in the range from 0.1 Hz to 100 kHz were tested. Both the change of the current ratio and the angular shift between the transformer secondary current and the total primary current were analyzed.
    Źródło:
    International Journal of Electronics and Telecommunications; 2020, 66, 4; 701--705
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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