【正文】 and etc. national capital have demonstration engineering[5], in order to verification standard, pass practice to promote standard of further , at Germany from FGH, VEW, ABB, ALSTOM and SIEMENS a few pany consociation establishment a demonstration item OCIS(the In Substations of the Open Communication), establishment this item of purpose BE: (1)Comparison and test IEC 61850 standard drafted plan and 。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 to 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. Key words: IEC 61850； UML； IED； Object model； Logical node； Logical equipment Substation automation system by multiple subsystems is essentially posed of distributed control system, therefore layer in the transformer substation Still, the internal system through internal data munication, to realize the subsystems between subsystems and internal information exchange and sharing information, to reduce the substation second equipment configuration, and simplify the repeat of the subsystems of the interconnections, not only reduce repeated investment, and also to improve the security and reliability of the system as a whole. But, the actual circumstance of each transformer substation be respectively each product supplier in order to fight, usage dissimilarity of munication code. Almost each produce a pany should the pany all have a set of oneself of standard, cause in the whole system circulate of the code may attain several 10 kinds. Equipments can39。s direction and automation tendency of automation, and arouses the widespread interest of the domestic and foreign power industry. The transformer is a 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 transformer39。s, the international electrotechniques mittee IEC(the Commission of the International Electro technical) be aware of to e from dissimilarity factory house of the electronics intelligence equipments IED demand a standard of the information connect, with realization equipments of with each other operability(Interoperability).Is this, IEC two IEC TC57 of the technique mittee and the IEC TC95 established a consociation work set, establishment” after electricity protection the equipments information connect standard namely IEC608705103 standard The institute for research EPRI(the Research Institute of the Electric Power) of electric power science of the United States in 1990 beginning Mr. mon Letter system UCA(the Architecture of the Utility Communication) standard of establishment work, its purpose lie in provide a Have extensive adaptability of, the function be strong of correspondence agreement, can make various IED pass usage should agreement realization with each other operation[3]. For avoiding appear two possibility conflict of standard, IEC decision with the data model kimono duty is foundation, UCA Of research result bring into IEC standard, in the meantime absorb IEC608705103 standard of implicit data model, establishment unify of world scope standard IEC61850, and in 1999 March put forward mittee drafted plan edition. IEC 61850 be the correspondence work of transformer substation automation and the international standard of system. Establishment IEC 61850 main purposes is make dissimilarity manufacturer of the product has with each other operability and make these product drive expediently integration to go in a system. According to IEC 61850 of definition, with each other operability is e from same factory house or dissimilarity factory house of the IED(the Commission of the International Electrotechnic) exchange information and exactitude usage the information moderate operation of ability. If the of IED can carry on with each other operation, then constitute to176。 (4)The help standardize progress。 (2)Oneself acquaint with first and control UML to unify to set up mold language, and as to it39。 3)with each the service related parameter. The ACSI was main to provide 13 kinds of model, according to face to the method of object to say that be 13, the type method be an IED equipments outward realization of abstract correspondence service connect, the parameter of type be an IED equipments concrete of function and appearance of description. The layer structure of the IEC61580 The agreement IEC61850 of work and system of the transformer substation correspondence standard put forward the concept of information layering inside the transformer substation, regardless from On the logic concept still appurtenance reason concept up, all transformer substation of correspondence the system is divided into transformer substation layer, partition layer and process layer three layer, and definition the logic of of layer and layer connect, such as diagram 21 show: Moreover, according to the layer structure of the transformer substation distribute type,