通过实验给出大电流测量用互感器铁心开口的规律采用霍尔效应原理研制出一种直放式、有2级输出的大电流互感器,它与目前地铁直流系统中采用的磁调制式的直流互感器相比,具有线性度好、成本低等特点。%The rules of air gap in the core of large current transformer are presented. Applying Hall effect a kind of open-loop large current transformer with two-stage output is developed. It is better linearity and lower cost and so on comparing with the magnetic modulating type direct current transformer used in the subway now.
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