【摘要】 对于恒压源供电的60 Hz感性电路而言,冲击电流大约出现在突然短路后的半个周期内。但是,不同时间常数的电路所对应的冲击电流出现时刻会有所差异。为此有必要分析实际电路中冲击电流出现时刻与半个周期的最大差异,即最不利的情况。经过分析可知,冲击电流出现在短路发生后的(0.96/120,1/120) s,与半个周期的最大差异小于4%。另外,冲击电流出现时刻是电路时间常数的拟凸函数。更多还原

【Abstract】 For a RL series circuit supplied by a constant voltage source which working at 60 Hz, roughly speaking, the maximum peak current occurs nearly at half of a cycle after the short circuit suddenly occurs.Because the different time constant affects the instant of short circuit maximum peak current’s occurrence differently, it is necessary to consider the worst case, namely, the maximum discrepancy with half of a cycle when maximum peak current appears. The conclusion is that the time interval when maximum peak current appears is (0.96/120,1/120) s after the short circuit suddenly occurs, i.e., the maximum discrepancy with half of a cycle is less than 4%. Additionally, the instant of short circuit maximum peak current’s occurrence is a quasiconvex function of time constant.更多还原