Figure 6 shows the typical oscillogram of the lower Jc
group, compared with the oscillogram of the higher Ie
group in Fig. 2. The inverter's switching timing
synchronizes with that of the current interruption by the
vacuum switch in Fig. 2, whereas the inverter's
switching timing does not synchronize in Fig. 6. Hence,
the high-chopping-current phenomena is supposed to be
the result of the 'double chopping' by both the vacuum
switch and the inverters.
1.3360ms