Digital Watt-hour metering system and verification equipment

The communication protocol structure of digital substation based on IEC61850 has greatly changed.The data acquisition of digital substation is analyzed and the difference between the metering system of digital substation and the traditional metering system is described.There is great difference in two parts: digital transformer and digital Watt-hour meter,which are analyzed and compared in principle.The typical application structures of digital Watt-hour meter and digital metering system are put forward in accordance with IEC61850-9-1 or IEC60870-5-1 protocols.As the output current and voltage signals of digital Watt-hour meter adopt IEC61850 protocol,the digital Watt-hour meter verification equipment of digital metering system is quite different from traditional one in implementation,for which the correspon-ding analysis is given and the feasible solution is presented.