Protective Action Analysis Expert System

With the development of computer information technology, a new seedtime for railway traction power supply system automation has come. The reliability of relay protection devices is more and more important when structure and running mode of electrical railway vary from day to day. The paper designs a Protective Action Analysis Expert System, which is shorted as PAAES, through study of automation devices used in railway traction substation and analysis of management of information system for the motion of traction power supply system. PAAES has three functions, which are management of protection information, analysis of protective action and virtual protection. It mainly includes connection of automation devices, storage and management of protective action, display and analysis of recorded wave data, virtual realization of protective action, management of expert protective action analysis knowledge, expert analysis of protective action results, data transmission of dial-up network, setup of system parameter and so on. The success of PAAES design has a very important significance, it provides a powerful tool which can make relay protect tasks standardize and intelligentize. These tasks include normal running of relay protect devices, fault analysis, fixed value management and protective action checkout. So it can less local worker's workload and improve their work efficiency, which are very important to the running of power supply system on the safe side. It is important for railway traction power supply system automation.PAAES adopt OOP technology, distributed multiplayer structure and ADO technique for accessing database. It is realized under theories of expert system and management information system. It has a good GUI for local workers and its operation is very simple and easy to understand. The designed system has some important significance to the automation of railway traction power supply system.