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XU Jian-ju. Research of over-voltage of coal mine power system[J]. Journal of Mine Automation, 2013, 39(2): 107-111.
Citation: XU Jian-ju. Research of over-voltage of coal mine power system[J]. Journal of Mine Automation, 2013, 39(2): 107-111.
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Research of over-voltage of coal mine power system

  • Shanxi Shanmei Huangling Mining Industry Co., Ltd., Huangling 727307, China

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  • In view of problem that 35 kV power system of a Coal Mine often happens over-voltage at thunderstorm day, the paper analyzed causes of over-voltage, indicated that over-voltage was induced by fraction frequency resonance and the fraction frequency resonance was induced by PT and capacitance to earth of overhead line. Through analyzing parameters of resonance over-voltage of the power system, it gave corresponding reform scheme, namely replacing PT with better excitation voltammetry characteristic, adding nonlinear harmonic eliminator at neural point of high-voltage side of PT and installing intelligent resonance eliminating device with multifunction. The actual application showed that 35 kV power system has not happened resonance over-voltage with reliable running after using the reform scheme.
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