Research Of Merging Unit Based On IEC61850

Electronic Transformers have more advantages then electromagnetic transducer ,such as small in size, large dynamic range, without Ferroresonance, good insulation ect. It will be widely adopted in digital substation. But in the realization of digital substations, one of the key technologies question is how to interface between the electronic transformer and the second equipment, and the merging unit is the device of connecting electronic transformer and the second equipment , so researching the merging unit not only can simplify the second equipment but also can improve the accuracy and reliability of realizing the sharing of information within the substation and enhance system integration, it have great theoretical significance and application value.Based on IEC61850 standards, this paper described and researched the features and functions of merging unit-the digital interface components of electronic transformer of the relevant standards. At the same time it is reasonable divided to three function modules: data receiver module, data-processing module and data output module, which is based on the design of this paper.This paper first design the model of the merging unit according as IEC61850 standards, secondly, it use the FPGA technology design the data receiver module of merging unit. It also research in-depth the synchronization problem of merging unit, and use the method of clock synchronization to sync the sampling data of merging unit, this method can good guarantee data synchronization; Finally, it design the data output module, using ARM and Ethernet controller hardware platform, it realizes the sample data rapid and accuracy transmission according as IEC61850-9-1.Software simulation and experimental results show that the design of the two units function modules of the merging unit can better accomplish their respective functions, it also provided the realization of a viable method of merging unit to solve the same time multi-tasking, communication of information flow, high speed of merging unit.