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    Wyświetlanie 1-3 z 3
    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:
    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
      Wyświetlanie 1-3 z 3

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