【正文】 o the practical stage, Power industry departments put substation automation as a means of the new technological innovations in power system operation, professional major manufacturers have put substation automation system development as a key development projects, continue to refine and improve their own corresponding to the introduction of integrated substation automation system power system to meet the requirements. Abroad from the early 1980s, began to carry out research and development so far, major power equipment panies are gradually introduced to the mass production products. If ABB, SIEMENS, HARRIS panies, since the 1990s, new substation countries in the world use most of the digital secondary equipment。 accordingly adopted a substation automation technology。 China launched integrated substation automation research and development pared with developed countries of the world later, But with the number of protective equipment in a mature and widely used, scheduling automation systems mature application, Substation automation system has been the power system user acceptance of the use, However, the use of the electricity sector in the process, there are roughly two principles : First, the low voltage substation automation system in order to better implement the Unattended achieve reduced efficiency purposes。 Second is the high voltage substation (220 kV and above) the construction and design, is calling for the use of advanced control method address the professional technical scattered, as a system, redundant investment, and even affected the operational reliability. And the actual project surviving in the following major issues : the integrated substation automation structure and modefrom the current domestic and foreign integrated substation automation of the development, generally exist following structure :(1)Distributed System Architecture Substations are under surveillance by an object or system function distribution of multiple singlefunction puter equipment, They will be able to connect to a network to share resources to achieve distributed processing. Here we are talking about the 39。distribution39。 is the physical resources by the substation on the distribution (not emphasize geographic distribution), stressed is the angle from the puter to study the distribution of the problem. This is an ideal structure, in order to fully distributed architecture, scalability, Universal and open areas with strong advantages, However, in practical application of engineering and technical realization will encounter many current issues that are hard to solve, If the scattered layout of the installation, poor operating environment, resistance to electromagnetic interference, information transmission channels and reliability assurance on the issue and so on, on the current technique is not enough mature, blind pursuit of fully distributed structure, neglected works practicality is unnecessary. (2)centralized system structureSubstations are under surveillance by an object or system function distribution of multiple singlefunction puter equipment, They will be able to connect to a network to share resources to achieve distributed processing. Here we are talking about the 39。distribution39。 is the physical resources by the substation on the distribution (not emphasize geographic distribution), stressed is the angle from the puter to study the distribution of the problem. This is an ideal structure, in order to fully distributed architecture, scalability, Universal and open areas with strong advantages, However, in practical application of engineering and technical realization will encounter many current issues that are hard to solve, If the scattered layout of the installation, poor operating environment, resistance to electromagnetic interference, information transmission channels and reliability assurance on the issue and so on, on the current technique is not enough mature, blind pursuit of fully distributed structure, neglected works practicality is unnecessary. (3)Distributed hierarchical structureAt the substation level and control targets set up the station control level (grade point) and the local unit control level (level of) the twostory Bush control system. This pared to the centralized structure of the system with the following obvious advantages : ①enhanced reliability, as part of the equipment failure affects only the part of the forthing 39。dangerous39。 scattered, When the stationlevel system or network failure, it affects only part of the monitoring, and the most important protection, control function of the level will continue to run。 to the level of an intelligent unit should not lead to damage to the station39。s munications interruptions, For example, longterm occupation of the station39。s munications network②scalability and open higher, to the design and application.③stations secondary equipment necessary cables significantly reduced, saving the investment will simplify the maintenance of debugging.Substation automation application refers to automatic control technology, information processing and transmission technology, puter hardware and software systems or automatic devices to replace manual operation of the various operations and improve substation operations, A level of management automation system. Substation automation areas include integrated automation technology。 Substation automation refers to the secondary equipment (including control, protection, measurement, signal devices and automatic remote devices) through the use of puter technology functions of reorganization and optimization of the design, Substation to the implementation of automatic monitoring, measurement, control and coordination of an integrated automation system It is automation and puters, munication technology in the field of integrated substation applications. integrated substation automation munication network within the establish