The communication protocol structure of digital substation in smart grid has changed greatly, and the electrical energy metering system is changed greatly too. In this paper, an all-digital electrical energy metering system based on pure optical voltage transducer (OVT) and optical current transducer (OCT) is introduced. The advanced communication protocol IEC618509-2 is adopted in the all-digital electrical metering system firstly. And in this paper, the difference between traditional electrical energy metering system and all-digital electrical energy metering system is analyzed and compared in principle, and the benefits of all-digital electrical energy metering system are described. The realization of the proposed all-digital electrical energy metering system on a 220 kV voltage grade power system is described. The results of running show that the developed all-digital electrical energy metering has the performances of high accuracy, high reliability and high safety.
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