At present

most of mirco-chip based relay protection systems and electronic electric-meters adopted traditional magnetic core current transducer.However

this kind current-voltage converter had serious magnetic saturate problem in the application and its dynamic metering range was narrow.This paper proposed a PCB style current-voltage converter

which had four symmetrical secondary spiral air-core coils on the same surface and could eliminate impacts caused by outside magnetic field as possible.All kinds of interference in the current-voltage converter were presented and analyzed;some measures to improve capabilities against interference were suggested.At last

a prototype of PCB current-voltage converter was made and tested.The experiment data indicate that the PCB converter has reached the requirement and has good linearity in a large dynamic metering band with fast dynamic response.