IEC61850 Revamping of Microcomputer-Based Transmission Line Protection

It is necessary to update the traditional microprocessor-based protection device to meet IEC61850 in the transformation of digital substation. Taking microcomputer-based transmission line protection as an example, this paper adds communication module to the original hardware to realize its external communication through Ethernet to meet the IEC61850 communication standard. Decomposition of functions and identification of logical nodes and logical devices are performed for the protection device, and data model of longitudinal differential protection is build. Finally the IEC61850 information model and service are completed. The modeling method used in this paper has better application value for other protection equipment and good reference significance to the study and practice of IEC61850 standard.