双电源快速切换事件过程仿真分析

Event Simulation Analysis of Fast Speed Transfer Process in Double Power Supplies

使用ETAP仿真软件对某变电所进线三相短路故障进行了双电源快速切换分析。结果表明,在发生进线三相短路故障快速切换过程中,母联开关和电动机保护的冲击电流不大于电流保护整定值,快速切换装置切换成功,仿真和实际切换过程具有一致性。但是,快速切换成功的原因并不是满足快速切换的四个条件,而是由于三相短路故障母线残压衰减快满足母线残压切换条件,但又能达到快速切换的目的。

Fast speed transfer processes of the three-phase short-circuit event in double electric power supplies is analyzed by help of ETAP simulation software. The simulation results show that, two fast speed transfer processes are identical after the three-phase short-circuit event of double electric power supplies, that is, instantaneous current of bus-to-bus switch and motors is lower than their current protection sets, trip of feeder switch and close of bus-to-bus switch are successful. However, the reason of the successful switches operation is not the four criterions of fast speed transfer processes, is residual voltage criterions due to rapid attenuation when three- phase short-circuit event occurring.