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动车组高压套管作为连接车载变压器和车顶高压电缆的主要绝缘设备,其可靠性直接影响动车组的运行可靠性。基于ANSYS有限元软件分析了高压套管的电场分布特性,通过分析高压套管的电位和电场分布情况,掌握工作状态下高压套管的工作特性。结果表明,高压套管内置的金属屏蔽网可以改善接地法兰附近的电场分布,但内置的金属屏蔽网边缘附件的电场强度分布较大,一旦出现网压过高时,金属屏蔽网上下边缘处可能是最先发生局部放电,甚至绝缘击穿,因此可以通过合理选择高压套管的耐压等级或合理优化套管结构降低高压套管的故障率,提高动车组运行的安全可靠性。
The high-voltage bushing of EMU, as the main insulation equipment for connecting the vehicle transformer and the roof high-voltage cable, has a direct impact on the reliability of the operation of the EMU. Based on ANSYS finite element software, the electric field distribution characteristics of high voltage bushing were analyzed. By analyzing the distribution of electric potential and electric field of high voltage bushing, the working characteristics of high voltage bushing under working condition were grasped. The results show that the metal shielding net built in high voltage bushing can improve the electric field distribution near the grounding flange. However, the electric field strength distribution of the built-in metal shielding net edge attachment is larger. When the net voltage is too high, the upper and lower edges of the metal shielding net May be the first occurrence of partial discharge, or even breakdown of insulation, so you can choose a reasonable high-pressure casing pressure rating or reasonable optimization of the casing structure to reduce the failure rate of high-pressure casing to improve the safety and reliability of EMU operation.