The All-digital Electrical Energy Metering System Based on Optical Current and Voltage Transducer

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.