杯状纵磁真空灭弧室开断能力与触头直径和触头开距关系的试验比对

对杯状纵磁真空灭弧室的极限电流开断能力与触头直径和触头开距间的关系I=k×D2×Bz0.4进行了试验验证。当触头直径分别为48,58,66mm时,触头开距设定为8,11,14mm,对9只真空灭弧室试品在振荡回路上进行极限开断能力试验;用三维有限元方法对9种情况下的纵向磁场进行了计算;将计算结果带入公式与试验结果及灭弧室开断能力标定值进行比较,考虑试验的误差,认为公式有参考意义。

Experimental Validation of Relationship Between Interrupting Capacity of Axial Magnetic Field Vacuum Interrupters with Cup Type Contacts and their Contact Diameters and Contact Gaps

The relationship between maximum interrupting capacity of AMF vacuum interrupters with cup type contacts and their contact diameters and contact gaps is proposed to be I=k×D2×Bz0.4,which is experimentally validated in this paper.The contact diameters of the prototype vacuum interrupters are 48,58 and 66 mm and the contact gaps are 8,11 and 14 mm separately.9 vacuum interrupters are tested with oscillation circuit to measure their limit interrupting capacity.Axial magnetic flux density in the 9 cases is analyzed by 3D finite element method.With the calculated axial magnetic flux density results,limit interrupting capacity of the vacuum interrupters is predicted by the equation,which is compared with the experimental results and rated interrupting capacity.Considering experimental errors,the prediction results are meaningful.