显式有限元在某型高压断路器传动系统分析中的应用

Application of Explict Finite Element in Drive System of High-voltage Circuit Breakers

基于参数化编程,建立了某型高压断路器传动系统的有限元模型,从减小计算量的角度出发,对模型进行了一定的简化。基于显式动力学方法,对传动系统中重要部件在分闸过程中的变形以及应力状况进行了计算。将实测的操动机构输出位移曲线作为位移载荷施加于有限元模型。由于显式动力学计算中的时间步小,位移曲线的测量结果中的跳动会导致计算的不稳定,因此对实测的位移曲线进行了拟合,同时考虑了动静触头之间的摩擦力。通过对传动系统中重要部件的变形及应力变化规律的分析,为传动系统的进一步优化设计奠定了基础。

A finite element model of drive system of a high-voltage circuit breaker is built by means of a parameterization program. The model is simplified to reduce calculation time. The deformation and von-Mises stress of the key parts in the drive system are calculated based on explicit finite element method. The measured displacement curve of the drive system is taken as displacement load to be input to the model. As the time interval in the explicit finite element analysis is small, the pulsation in the measured displacement curve will lead to unstable computation, so the measured displacement curve is smoothed by fitting. The friction between the moving and stationary contacts is also considered. The analysis results of the deformation and von-Mises stress of the key parts in the drive system may provide a basis for optimization design of the drive system.