| With the mass growth of the power system transmission parameter, the power system transmission parameter management system has become one important part of the management of the power systems. The establishment of the power system transmission parameter management system will have great effects on rising the ability for the supervisory and management of power systems.Visualization, integrating with the Energy Management System (EMS) and the online display of the values of power flow and voltage take effective way to the security and reliability of the power transmission systems. Geographic Information System (GIS) has been widely used in power systems resolving the visualization problem and has been proved to be very effective. Therefore, It's necessary to develop a GIS based power system transmission parameter management system.At the beginning of the thesis, some correlative and fundamental knowledge including the application of GIS in power systems, the function of the power system transmission parameter management system, the operation system UNIX, EMS, GIS platform ARC/INFO and it's geographic data model are introduced. Then, the integrating of GIS&EMS and Common Information Model (CIM) based design of the parameter database, which are the two main technologies of the development of the parameter management system, are discussed in the thesis.A method of GIS based online power system transmission parameter visible management system on Unix is introduced in this thesis. This parameter management system was developed by AML (Arc Macro Language) on the GIS (geography information system) platform ARC/INFO of ESRI. In this system, Online display of the power system transmission parameter was achieved by integrating GIS with EMS, and a CIM based database was established. The use of this system in the power system dispatching and communication center turns the result of the visible management of the power system transmission parameters.
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