Couty Power Grid Relay Protection Setting System Development And Appiication

The relay is an important and indispensable part of power system; it is charged with the task of removal faulty components and to ensure the safe and stable operation of power system. The protective device whether it can be correctly actions rely on setting calculation to obtain the reasonable protects value to be guaranteed. At present most of the county power supply company are still using manual calculations to do relay setting calculation work, in recent years, since of the county-level grid during the large-scale transformation, with the grid transform the County power grid structure and configuration of the protection devices were greater change, make the manual setting calculation manner difficult to adapt to the new situation of the grid developing. In this paper, proposed the county relay protection setting calculation system developed ideas in connection with county power grid structure and setting features developed a set of county power relay protection setting system.The system can greatly improve the working efficiency and accuracy of the Protective Relaying tuning; make the setting calculation staff break away the hand count complex work. The system can achieve such functions as electrical wiring drawing, failure analysis, Setting relay value and generation setting form report. This article using object-oriented visual programming technology complete system development, Object-oriented programming can be effectively overcome the problem of large power systems software difficult to maintain and expand. We use the improve breadth-first search algorithm to achieve the formation of the zero-sequence network topology in the development of the system fault calculation module, and use the breadth-first search algorithm to determine the stage of relay protection setting cooperation relations in the development of system setting module, This article have detailed elaborated each functional module implementation process of the system and system applications. The system has passed the acceptance of power supply company expert group; the results show that the system have achieved satisfactory effect.