基于三维有限元的静态连接梅花触头短路暂态电动力分析

针对梅花触头电动稳定性设计与接触失效机理分析,采用三维有限元方法建立了梅花触头电动力计算模型,基于该模型分析计算了短路负荷条件下的梅花触头与导体的电动力暂态变化过程.通过与其它计算方法对比分析,结果表明该计算模型可以克服经验公式法无法准确考虑触指结构的缺点,能够较为准确计算不同触指结构的梅花触头短路电动力分布.基于该模型分析了梅花触头短路电动力的影响因素,分析结果表明短路电动力增大引起的梅花触指接触压力减小是造成梅花触头失效的一个重要原因,增大接触压力对提高梅花触头电动稳定性的作用有限,增加触指片数和减小触指半径是提高梅花触头电动稳定性的有效途径.

Transient Electromagnetic Force Analysis of Stationary Butt-contact Under Short Circuit Conditions Based on 3D Finite Element Method

With the aim to electric stability design and failure mechanism analysis of butt-contact,a electromagnetic force calculation model of butt-contact has been built based on 3D FEM method.The transient process of electromagnetic force under short circuit conditions have been calculated,Analysis results compared with other calculation methods show that the FEM model can overcome the shortcuts of the formula method,which could provide more accurate calculation refer to different structure butt contacts.The influence factors of short-circuit electromagnetic force been analyzed,Analysis results show that the contact force diminish by shortcircuit electromagnetic force increase is an important mechanism of the butt contact failure.Increase the number of contact fingers and decrease the radius of finger are effective methods to enhance the electric stability of butt contact yet increase contact force have very limited effect.