IEC 61850 realizes the interoperability among intelligent electronic devices (IEDs) by setting up a layered architecture

a unified object model and an abstract commutation service interface

thus reducing the cost of design

integration

operation and maintenance of the system. The software design scheme of bay level IED based on IEC 61850 is studied

the function model of IED analyzed and the module composition of software designed. The principles and implementing methods of such key technologies as UML design of the object model

XML

communication modes of GOOSE

SAV

GSSE message and multitask running are studied. Some references are put forward for the product development of the new IEDs obeying IEC 61850.