System of Setting Calculation and Simulation of Relaying Protection on Local Power Network

According to the running condition of local power network at present, system of setting calculation and simulation of relaying protection is developed for power system based on graphic modeling. It makes use of graphical software to complete data and process management, fault analysis of power network, setting and simulation of fixed value. By building all kinds of calculation models of running method, setting calculation can be achieved in both automatic and semi-automatic calculation. Through the control of calculation process and the experience of setting engineer, it optimizes the setting value of relaying protection equipments in different ranks of power network by virtue of setting procedure, achieving the optimal setting scheme in different structures of power network and running modes. Setting the running mode in main wiring diagram, random fault, fault point and simulation time, software is designed to simulate the fault calculation and logical decision automatically, making sure the action of relaying protection and tripping out the corresponding circuit breaker. As the base of whole system analysis, graphic system is developed in Visual C++ and Microsoft Access with adoption of the object-oriented ideas. Having such excellent features as visualization and modularization, the whole system is easy to expand and maintain.