基于有限元的高压设备箱绝缘优化研究

Insulation Optimization of High Voltage Box Based on Finite Element Method

电缆连接器高压端部对箱体四壁放电影响动车组可靠运行,对连接器端部进行合理优化,可降低故障频次。分析绝缘护层加装位置、绝缘护层结构和绝缘护层厚度对电场强度分布的影响规律。仿真结果表明,电缆连接器高压端加装绝缘护层可有效改善电场分布,绝缘护层应紧贴连接器端部金属部件并延伸至靠近高压端的首个伞裙根部。试验结果表明:优化后的电缆连接器雷电冲击电压耐受值满足高海拔地区运行要求。

The discharge between cable connector and box walls directly affects the operational reliability of CRH. Optimized design of the electric field distribution of the connector can improve stability of CRH. The sheath installation position, sheath structure and thickness of the insulation layer were analyzed to see its influence on the distribution of field intensity. The simulation results show that insulating jacket positioned at the high voltage end of cable connector can effectively improve the electric field distribution, insulation sheath should appress to the high voltage fitting end of the cable connector and also extend to the root of first ceramic umbrella. The test result shows that after installing the insulation sheath cling to the high voltage fitting surface, the withstand lightning impulse voltage value of the cable connector can fit the operational requirement at high altitudes.