动车组接地回流分配机理试验研究

Experimental Study on the Characteristics of Grounding-return Current for High-speed Electric Multiple Units

随着高速列车的不断提速,牵引功率不断提升,导致接地回流逐渐增大,轴承电势升高、电蚀加重,严重威胁列车运行安全。文中基于现场试验,通过现场测试CRH380系列动车组接地回流,分析了工作接地与保护接地分配规律,研究了动车组接地方式对牵引回流的影响。结果表明:保护接地电流与工作接地电流波形变化趋势基本一致,工作接地电流最大值为398.45 A,总工作接地电流占车体回流的72.29%;头尾车保护接地电流最大,约占总保护接地电流的66.68%。以上结论为设计车体接地系统提供了实践基础。

The increasing speed of high-speed train and its traction power results in the increase in the grounding return current, the potential between train＇s body and rail, and the aggravative electrical erosion to harm safe running of the train. In this study, field tests were conducted to measure the grounding return current of CRH380 series electric multiple units （EMUs） for the purpose of revealing the distribution laws of operational grounding current and protective grounding current, as well as the impact of EMUs grounding mode on traction return current. The results show that： 1）the waveforms of the operational and protective grounding currents are of almost same changing tendency, the maximum of the operational grounding current is 398.45 A, which accounts for 72.29% of the total train body＇s return current; and 2）The protective grounding current get its maximum on head and tail units of the train, which accounts for 66.68% of the total protective grounding return current. This study may provide a reference for the design of EMU grounding system.