| In busbar protection is one of the most important protection in the electrical power system,its safety running relates weather the whole substation can run steadily .Comparison with the traditional centralized busbar protection,distributed busbar protection can be locally installed and shorten CT secondary cable, which accord with layered and distributed structure of substation automation.foremost,with compute and command the breaker are independently carry out by each protector,expense by mistake can be markedly decrease. Design of distributed busbar protection are consist of protector and communication mode.IEC61850 is an international standard for the future substation automation communication system have reflected the direction and trend of substation automation communication developing. Developed relay protection intelligent electronic devices (IED) applicable to IEC61850 has become a very important part to realize digital substation .First,double busbar fault are simulate on the use of RTDS and Matlab, determining the ratio double-differential criterion as the differential protection criterions of distributed busbar protector.Then, the model of function according to IEC61850 have be taken based on the parts of busbar protection such as differential protection, circuit breaker failure protection.these function have be mapped on logic node and the data object and its attribute are established . The logical device (LD) model are consist of three parts: input of analog signals,input and output of digital signals and protect accout.the dynamic process has be describe by sequence drawing in UML. The software algorithm of protection have been compile ,and be validated on PC. Then,Finally, based on the requirement of SV and GOOSE message transfer according to IEC61850, a scheme for realizing distributed busbar protection at the process level be proposes. And verify the feasibility of 100M Ethernet using in process line substation by OPNET simulation software .
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