两种不同铁芯结构纵磁真空灭弧室触头三维磁场对比分析

Comparative analysis of 3-D magnetic field for axial magnetic field vacuum interrupter contact with two different iron core structure

本文建立了两种不同铁芯结构的纵向磁场真空灭弧室触头三维模型,一种铁芯为带有断口的环状结构,另一种是由12个柱状铁芯圆周方向排列的结构,采用有限元分析方法对两种结构的三维模型进行仿真计算,分析对比两种铁芯结构对电流峰值时刻纵向磁场和电流过零时剩余磁场以及磁场滞后时间的影响,计算的过程中考虑到了涡流的影响。从仿真结果中可以得到以下结论:1.电流峰值时环状铁芯结构产生的纵向磁场大于柱状铁芯结构,但柱状铁芯结构产生的纵向磁场比环状铁芯结构的均匀;2.电流过零时两种铁芯结构的剩余磁场分布相似,但环状铁芯结构的剩余纵向磁场大于柱状铁芯结构;3.柱状铁芯结构的磁场滞后时间要小于环状铁芯结构,电流过零时剩余磁场强的区域对应的磁场滞后时间也大。

In this paper, three-dimensional models of the axial magnetic field（AMF） vacuum interrupter contact with two differ- ent iron core structure were built up, one kind is a ring with a rabbet, the other is 12 cylinder cireumferentially arranged. The three-dimensional models were simulated by finite element method （FEM）. With the current at peak value and zero, the AMF distributions of the two models on stationary and moving contact surfaces and on the mid-gap plane between the two surfaces were all calculated, as well as the lag time of AMF, the results were compared and analyzed, and eddy current effect was consid- ered in the simulation. The simulation results showed that with the current at peak value, the AMF generated by the ring struc- ture is larger than the columnar structure, but the distribution of the columnar structure is more uniform; with the current at zero, the distribution of the residual magnetic field of the two structures is very similar and the ring structure is larger than the colum- nar structure; the lag time of the columnar structure is smaller than the ring structure, the large residual magnetic field correspond to the large lag time.