Research of over-voltage of coal mine power system
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摘要: 针对某煤矿35 kV供电系统在雷暴日经常发生过电压现象的问题，分析了过电压产生的原因，指出是分频谐振引起系统电压异常，电压互感器和架空线路的对地电容是引起分频谐振的元件，通过分析该供电系统的谐振过电压参数，给出了相应的改造方案，即更换励磁伏安特性较好的电压互感器，在电压互感器高压侧中性点加装非线性消谐器，安装多功能智能消谐装置。实际运行表明，该改造方案实施后，35 kV供电系统未发生谐振过电压现象，运行可靠。Abstract: 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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