随着高速动车组接地方式的改变,车体升弓浪涌过电压也不相同.本文为分析接地方式对高速动车组升弓浪涌过电压的影响,基于某型动车组接地方式,构建高速列车升弓等效电路模型,在此基础上分析升弓浪涌过电压的产生机理、分布特性,并将现场测试数据与仿真结果进行对比;仿真分析不同接地方式对升弓浪涌过电压的影响.结果表明,高速动车组升弓时,最高车体浪涌过电压幅值达到4.95 kV,并在20μs内迅速衰减;采用直接接地方式最高升弓浪涌过电压幅值减小为2.4 kV;在接地电阻器两侧并联电容也可有效降低过电压幅值,过电压幅值与并联电容值有关,电容值取10μF时较为合适,此时过电压最小降低为2 k V.以上结论可为研究接地方式对于车体升弓浪涌过电压的影响提供理论基础.%The values of car-body surge overvoltage vary with the change of the grounding modes in the process of pantograph raising .In order to analyze the influence of grounding modes on surge overvoltage caused by pan-tograph raising ,firstly ,based on the grounding mode of a certain type of EMU ,the equivalent circuit model of-pantograph raising was built to study the generation mechanism and distribution characteristics of the surge ov-ervoltage caused by pantograph raising .Then ,the field test data and the simulation results were compared . Through simulation ,the impact of different grounding modes on the surge overvoltage during pantograph rais-ingwas analyzed .The results show that the maximum over-voltage amplitude reaches 4 .95 kV and rapidly at-tenuates in the 20μs when the pantograph of high-speed EMU is lifted .With the direct earthing mode ,the max-imum surge overvoltage amplitudeis reduced to 2 .4 kV .T he overvoltage amplitude can be effectively reduced when the grounding resistors are connected in parallel with capacitors .The amplitude of overvoltage is related to the vaule of the parallel capacitance ,taking 10 μF as optimal capacitance vaule at w hich ,the vaule of over-voltage will decrease to 2 kV .The conclusions provide a theoretical basis for studying the influence of ground-ing mode on surge overvoltage caused by pantograph raising of high-speed EM U .
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