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在做断路器试验时,经常要测量断路器的分、合闸时间及最低动作电压等参数,为了安全,试验中一般要外加电源替代断路器的控制电源,文章分析了外加电源的特性对试验的影响.“,”When a circuit-breaker is to be tested， It'' s usually necessary to measure its time of closing and opening，the lowest actuating voltage and etc. For security，another power source is often used instead of that for control．Characteristic of this source would have some influences on measured results，of which certain analysis is benificial．