短路电流上升率对熔断器弧前特性影响的仿真与实验研究

限流熔断器通常在短路电流上升过程中熔断，为了寻求短路电流上升率对熔体的弧前特性的影响，本文利用ANSYS有限元分析软件，以狭颈截面积为0．16mm。的熔体为例，对其进行了建模。仿真结果表明，在相同截面断口、短路电流上升率为2～20A／us的条件下，弧前，2f随着电流上升率的增大而减小：电流上升率在10A／us以上，弧前，2f基本一致，变化率小于5％，在10A／us以下，上升率为2A／us其弧前I^2f比10A／us时增大了约21％。在相同电流上升率、狭颈形状的情况下，弧前I^2f与狭颈截面积的平方成正比。并通过实验验证了仿真分析的正确性。

Simulation and Experiment of Effect of Short Circuit Current's Rise Rate on Fuse's Pre-arcing Characteristics

Current-limiting fuse usually breaks in investigate the effect of short circuit current＇s rate the rise process of short circuit current, in order to of rise on pre-arcing characteristic. Based on ANSYS analysis and fuse-element which is cross section is 0.16 mm^2, a simulation model is given in this paper. The simulation result shows that when the short-current＇s rate of rise is between 2-20 A/us, pre-arcing I^2t decreases when short circuit current＇s rate of rise increases： when short circuit current＇s rate of rise is above 10 A/us, change-rate of pre-arcing I^2t is lesser than 5%; When short circuit current＇s rate of rise is 2 A/us, the pre-arcing I^2t increase 21% compared with the one of 10 A/us. In the same short circuit current＇s rate of rise and shape of cross section, the pre-arcing I^2t and cross section＇s square are in direct proportion. The experiment proves the correction of the simulation＇s analysis.