文档介绍：Modeling of Digital Protective Device According to IEC61850 A bstract IEC 61850 is an international standard about substation constituted by the substation IEC reflects the development's direction and automation tendency of automation, and arouses the widespread interest of the domestic and foreign power industry. The transformer isa core equipment in the substation its protection, measurement and control equipments are the main equipments of substation automation system. Therefore , it is significant for us to apply the IEC 61850 standard to the Digital transformer's protection, measurement and control. The background, the domestic and foreign present situations, the significance and the content of IEC 61850 are introduced in this paper, the analysis of IEC 61850 standard ’s modeling process are described. Firstly , based on the function free distribution and the assignment concept of IEC 61850, the protection, measurement and the control unit are separated and the respective function is describe by the logical node. Secondly, according to the modeling approach and principle based on IEC 61850 , the typical protection, measurement and the control logical nodes are taken as examples plete modeling of logical nodes with UML. At last, the flow chart of the function realization is described and the flow of the function realization is discussed. In this foundation, the transformer differential protection IED is taken as an example to show the configuration process of its logical equipment and the logical node. K ey word s: IEC 61850 ; UML ; IED ; Objectmodel; Logical node ; Logical equipment Substation automation system bymultiple subsystems posed ofdistributed control system, therefore layer inthe transformer substation Still, the internal system through internal munication, to realize the subsystems between subsystems and internal information exchange and sharing information, toreduce the substation second equipment configuration, and simplify the repeat ofthe