In switching ability test, we must use the transformer that can withstand the regular short-time load. In order to guarantee test striving, we also need configure test circuit equipment reasonably to make the low-voltage loop impedance reduction. 在通断试验中,要使用能承受经常性短时负荷的变压器,为保证试验的出力,还要使低压线路的阻抗减小,合理的配置试验回路中的设备。