With excellent linearity, wide working range, perfect consistency.With excellent transient characteristics, real waveform transfer, and can bear 20~40 times 
instantaneous impact from rated current and still be unsaturated.Suppressing dc component: when dc component contained in the input energizing quantity is 
no more than 50% of the input ac component,the ac component can pass the converter normally, 
and waveform distortion will not occur .