关键词：电压互感器;；周电流传感器；电压 - 电流转换；周电流检测
摘 要：In this paper an electronic voltage-current voltage transformer (EVCVT) scheme has been proposed based on voltage-current transformation,using the voltage-current transformation technology and weak current detection technology to achieve the accurate measurement of the grid voltage.It transforms the high voltage into low current by high voltage thick film resistor,then the current sensor transforms the low current signal into a standard analog voltage signal,thus an AD converter collects the voltage signal,and the value be imported into the microprocessor for filtration,calibration,coding.After filtering the data would be transmitted to the upper computer or relay protection devices of the digital substation.This paper focused on the design of hardware circuit of digital voltage transformer,developed the software package and produced a prototype control board.Initial experiments show that the scheme is valuable for digital substation.