Research methods: This paper analyzes differential current transducer function and circuit principle used in high- voltage board circuit of localization type A metro vehicle, then introduces its outline structure and material features and performance.
Research results: By application of differential current transducer in the field test for Guangzhou Metro Line 1，this paper proves the differential current transducer with reliable and stable working performance.
Research conclusions: By making Geld test of magnetic modulation type differential current transducer in Guangzhou Metro Line 1，which proves whose leakage current test accuracy can reach shove t 10%，with high immunity to external interference. Compared with other type current transducer, magnetic modulation type with remarkable advantage, can adapt to the requirement of traction inverter in localization type A metro vehicle,
2007, Vol. 24 
