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    Wyświetlanie 1-6 z 6
    Tytuł:
    Influence of Harmonics on the Working Efficiency of a 6/1.2 kV Transformer in a Pit Mine
    Autorzy:
    Ngo, Xuan Cuong
    Do, Nhu Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/2019271.pdf
    Data publikacji:
    2021
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    harmonics
    working efficiency
    transformer
    pit mine
    wyższe harmoniczne
    efektywność
    kopalnie
    Opis:
    Explosion-proof transformers 6/1.2 kV is important electrical equipment responsible for supplying electricity in underground mine electrical networks. A failure of this transformer will cause an interruption in the power supply and loss of safety in underground mining. Usually, explosion-proof transformers in underground mine electrical networks are designed and manufactured to work with ideal parameters such as sinusoidal currents, and the network structure is symmetrical. However, today in underground mine electric networks, many power electronics are connected to the network, such as inverters and soft starters. As a result, a current flowing through the transformer is non-sinusoidal, overloading the transformer even by working with the design specifications. This paper studies the influence of harmonics on the working efficiency of a 6/1.2 kV transformer in a pit mine. Research results suggest reasonable solutions for transformer operation to ensure longevity and not cause damage to the transformer.
    Źródło:
    Inżynieria Mineralna; 2021, 2; 149--156
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Single-Phase Voltage Loss and Load Carrying Mode on Mine Drainage Pump Motor in Vietnam
    Autorzy:
    Do, Nhu Y.
    Ngo, Xuan Cuong
    Powiązania:
    https://bibliotekanauki.pl/articles/2020166.pdf
    Data publikacji:
    2021
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    mine drainage pump
    single-phase voltage loss
    asynchronous motor
    harmonics
    górnictwo
    pompy
    drenaż
    Opis:
    Mine drainage pump is the most important load in mining which requires high reliability when operating. Currently, the power supply of a mine drainage pump is connected to the same power line with many nonlinear loads, and is equipped with power electronic converters, which makes the power supply nonsinusoidal. During the working process of a mine drainage pump, the load-carrying factor often changes, and many types of failures occur, among which single-phase voltage loss is the most common problem. In the case of a nonsinusoidal power supply, if a single-phase voltage loss occurs in different load modes, it will greatly affect the working mode of the mine drainage pump leading to influences on the working efficiency, the life of the pump, and sometimes it is necessary to recalculate the protection parameters. This paper studies the influence of single-phase voltage loss and load carrying mode on the working mode of mine drainage pump motor in case the of nonsinusoidal power supply. Research results show that, in the case of nonsinusoidal power supplied with single-phase voltage loss, copper losses in the rotor and stator circuits increase with increases in voltage total harmonic distortion (THD) and load-carrying factor, 5th order reverse harmonic increases copper loss in asynchronous motor the most, and higher harmonic components have less effect on copper loss in the motor. At the same time, the speed ripple decreases with the increase of the motor load factor and decreases in the presence of the 5th order negative sequence harmonic, and increases significantly in the presence of the 7th order positive sequence harmonic. 5th order negative sequence harmonic increases, the torque ripple increases, while the 7th order positive sequence harmonic reduces the torque ripple in the case of single-phase voltage loss. The results of the paper will help improve the operational efficiency of the mine drainage pump in Vietnam's mines.
    Źródło:
    Inżynieria Mineralna; 2021, 2; 341--352
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Harmonics on the Working Efficiency of a 6/1.2 kV Transformer in a Pit Mine
    Autorzy:
    Ngo, Xuan Cuong
    Do, Nhu Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/2019275.pdf
    Data publikacji:
    2021
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    harmonics
    working efficiency
    transformer
    pit mine
    wyższe harmoniczne
    efektywność
    kopalnie
    Opis:
    Explosion-proof transformers 6/1.2 kV is important electrical equipment responsible for supplying electricity in underground mine electrical networks. A failure of this transformer will cause an interruption in the power supply and loss of safety in underground mining. Usually, explosion-proof transformers in underground mine electrical networks are designed and manufactured to work with ideal parameters such as sinusoidal currents, and the network structure is symmetrical. However, today in underground mine electric networks, many power electronics are connected to the network, such as inverters and soft starters. As a result, a current flowing through the transformer is non-sinusoidal, overloading the transformer even by working with the design specifications. This paper studies the influence of harmonics on the working efficiency of a 6/1.2 kV transformer in a pit mine. Research results suggest reasonable solutions for transformer operation to ensure longevity and not cause damage to the transformer.
    Źródło:
    Inżynieria Mineralna; 2021, 2; 149--156
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Power Quality on the Performance of Explosion-Proof Transformers in Mining in Vietnam
    Autorzy:
    Do, Nhu Y.
    Ngo, Xuan Cuong
    Nguyen, Thi Hong
    Powiązania:
    https://bibliotekanauki.pl/articles/25212166.pdf
    Data publikacji:
    2023
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    power quality
    performance
    explosion-proof transformer
    fuzzy system
    górnictwo
    jakość energii
    Wietnam
    Opis:
    When meeting customer demand, utility companies must consider power quality. Currently, the industrial power network in general and the underground mine power network in particular have long feeder lines, supplying power to many nonlinear loads and power electronic converters, which reduces power quality. Poor power quality can damage sensitive equipment and lead to costly repairs, leading to lost time, data corruption, and lower productivity. In this paper, a fuzzy system is developed to determine the power quality of the power network for different operating conditions and study its influence on the performance of the explosion-proof transformer in the underground mine power network in Vietnam. The simulations and calculations were performed on Matlab-Simulink software for a three-phase, 630-kVA, 6/1.2 kV explosion-proof transformer in power networks with variable power quality. A fuzzy system is developed with four measurable inputs, including frequency deviation, voltage unbalance factor, total harmonic distortion of supply voltage, total harmonic distortion of current, and an output variable, power quality. The simulation results show that the explosion-proof transformer's performance decreases when the power quality degrades, and the proposed fuzzy system can accurately diagnose this.
    Źródło:
    Inżynieria Mineralna; 2023, 2; 61--69
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Influence of Voltage Quality on Asynchronous Motor Performance of EKG Excavator in Open Pit Mines – Vinacomin
    Wpływ jakości napięcia na wydajność silnika asynchronicznego koparki EKG w kopalniach odkrywkowych Vinacomin
    Autorzy:
    Ngo, Xuan Cuong
    Do, Nhu Y.
    Tran, Quang Hieu
    Powiązania:
    https://bibliotekanauki.pl/articles/318392.pdf
    Data publikacji:
    2020
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    power quality
    harmonic
    nonsinusoidal voltage
    EKG excavators
    jakość energii
    napięcie harmoniczne
    napięcie niesinusoidalne
    koparki EKG
    Opis:
    At present, in open-pit mining, the main and most important electrical load is the electric excavator, and currently using a variety of EKG excavators. 6kV electrical network in open pit mining has the characteristics such as long outgoing lines, use high-powered equipment, multiple branches, and increasing use of power electronics on the grid, this reduces the quality of the power supplied to the excavators EKG, resulting in an increase in power losses thereby greatly affecting the performance of the excavators. Previous studies on the quality of the power supplied to the excavator often only mentioned voltage deviations, in addition to this factor, the performance of the excavator is also greatly affected by nonsinusoidal voltage waveforms of the excavator power supply. This paper analyzes the influence of the nonsinusoidal of voltage on the power loss of electric motors used in EKG electric excavators in open pit mining based on the method of electromagnetic analysis and verification on simulation software.
    Obecnie, EKG są powszechne koparki stosowane w kopalnictwie odkrywkowym Wietnamu. Sieć elektryczna 6kV w kopalniach odkrywkowych ma takie cechy, jak długie linie wychodzące, zastosowanie sprzętu o dużej mocy, wiele odgałęzień co obniża jakość energii dostarczanej do koparek EKG, skutkując wzrost strat mocy, co znacząco wpływa na wydajność koparek. Dotychczasowe badania jakości energii dostarczanej do koparki często wskazywały tylko na odchylenia napięcia. W artykule, przeanalizowano wpływ napięcia niesinusoidalnego na straty mocy silników elektrycznych stosowanych w koparkach elektrycznych EKG w górnictwie odkrywkowym w oparciu o metodę analizy elektromagnetycznej i weryfikacji w oprogramowaniu symulacyjnym.
    Źródło:
    Inżynieria Mineralna; 2020, 1, 2; 139-145
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Research on Electric Leakage Protection to Improve Electrical Safety in Underground Mining in Vietnam
    Autorzy:
    Nguyen, Truong Giang
    Nguyen, Thac Khanh
    Ngo, Xuan Cuong
    Do, Nhu Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/27323271.pdf
    Data publikacji:
    2023
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    electrical safety
    conversion devices
    mine power network
    leakage protection
    bezpieczeństwo elektryczne
    ochrona
    kopalnie
    Opis:
    To ensure safety in underground mining, it is imperative to equip yourself with electric leakage protection. Today, underground mines are gaining a high degree of mechanization and using more power electronics to enhance the operation and organization of power supplies, including the application of power electronics for DC power transmission in mining. i.e., separate the rectifier (AC-DC) from the inverter (DC-AC) with a long DC cable. The transmission of DC power changes the structure of the mine power network; then there will appear a power network with an industrial frequency of 50 Hz, a DC power network, and a power network after the variable frequency inverter. Due to the mutual interaction between DC power networks and AC power networks, leakage protection devices are unreliable, causing unsafe conditions in mining. The content of the article is to determine the leakage current in the power network when using converters in DC power transmission in mining. The research results are the basis for calculating and selecting leakage protection equipment for the purpose of improving safety in underground mining in Vietnam.
    Źródło:
    Inżynieria Mineralna; 2023, 2; 209--214
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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