A Metering Device for DC Energy Meters

This paper describes a metering device for DC energy meters. This device is used for measuring voltage, current and electrical energy of electric vehicle DC charging point. The device realizes the measurement of high DC current by using magnetic modulation DC current comparator. The DC voltage measurement range of this device is 3V~750V, and the DC current measurement range is 0.2A ~ 500A. The measurement results show that the DC electrical energy error of this device is blow 0.02^%, and the stability is better than 0.01%/min.