中文摘要：

高速动车组工作接地方式对接地回流分配有显著影响,接地回流在各接地碳刷间的分配规律对于碳刷的影响乃至动车组的安全可靠运行有重要意义。为揭示工作接地对于接地回流的实际影响,笔者基于试验动车组实体及其工作接地方式,利用Pspice建立高速动车组接地回流电路仿真模型,仿真分析了不同工作接地方式对接地回流分配规律的影响,对比分析了现场测试数据与仿真结果。结果表明,在改进工作接地方式前,牵引电流通过工作接地的电流最大达到300 A,改进后降低值达总牵引电流的13%~21%,左右轴差值仅占总牵引电流的2%。因此结论即增加工作接地点可以有效减小工作电流值,降低流过不同碳刷的工作电流差异。以上结论为制定标准动车组的接地方式提供了理论依据。

英文摘要：

The working grounding on distribution of grounding reflux. mode of high-speed electric multiple units （EMU） imposes a significant effect The distribution law of grounding reflux among each carbon brush is of great significance to the lifetime of brush as well as safe and reliable operation of EMU. In this study, to reveal the effect of working grounding mode on grounding reflux, a high-speed EMU grounding reflux model was built with the software Pspice based on real EMU body and its grounding way, effect of working grounding mode on distribution law of grounding reflux was analyzed, and the data obtained from simulation were compared with the data tested on site. The results show that the maximum working grounding current reaches 300 A before the improvement of grounding mode, while the working current is reduced by 13%-21% of total traction current, and the current difference among carton brushes is reduced to 2% of total traction current after the improvement. Conclusion is drawn that the working current and the difference of working current among carbon brushes can be reduced efficiently by increasing points of working grounding. The conclusion may provide a basis for determining working grounding mode of standard high-speed EMU.