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动车组在过分相、降弓等工况下均可产生过电压问题,针对动车组在站内升降弓过程中出现的过电压现象,文中应用MATLAB搭建受电弓升降等效电路,建立电磁式电压互感器的仿真模型;结合仿真和理论分析指出电压互感器在受电弓下降过程中发生低频铁磁振荡;升弓过程是电源电压稳态分量和回路自身高频振荡暂态分量的叠加产生过电压。对比升降弓的仿真结果可知升降弓会给电压互感器带来不同的危害。文中提出在动车组降弓时,切除高压电缆可以有效地降低电压互感器的励磁电流。
The over-voltage problem may occur in the EMU under over-phase and down-bow conditions. In view of the over-voltage phenomenon that occurs during the raising and lowering of the EMU in the station, MATLAB is used to build the equivalent circuit of the pantograph lift and establish the electromagnetic voltage Transformer simulation model. Combining with the simulation and theoretical analysis, it is pointed out that the low voltage ferromagnetic oscillation occurs during the voltage drop of the voltage transformer during the pantograph lowering process. The rising process of the bow is the superposition of the transient components of the steady voltage components of the power supply voltage and the high frequency oscillation of the circuit itself Voltage. Compared with the simulation results of bow-tie, we can see that bow-tie will bring different hazards to the voltage transformer. It is proposed that the exclusion of high voltage cables can effectively reduce the excitation current of the voltage transformer when lowering the motor train.