On-line monitoring and evaluating system and method for digital electric energy meter

The invention provides an on-line monitoring and evaluating system and method for a digital electric energy meter, and belongs to the technical field of electric energy measurement and test. The on-line monitoring and evaluating system comprises a merging unit, a switcher, an RS485 concentrator, a far-end computer, a data transmission unit and a local computer. The digital electric energy meter in actual running is monitored on line for a long time, sensitive factors affecting measurement errors and reliability of the event recording function of the digital electric energy meter are found out, a state evaluation model of a digital electric energy measurement system is set up, and application of new electric energy measurement devices such as an electronic mutual inductor and the digital electric energy meter to the digital substation electric energy measurement system is promoted.