| Protective relay is the key of the safe running of power system. Setting calculation and test is a work often done by protection people, which is miscellaneous and easy make a mistake. Today, those works are completed necessarily and possible using the new computer technology along with computer widely using. In recent years, some single protection setting software and setting simulation system is made. But these software is independent and can't link up automatically which the setting can't test directly after setting calculation, and we can't find out which breaker could move before the fault happening. So, aiming at the limitation of the present software and combining the practice of engineering, the intelligent system for protective relay setting and simulation on local power network is amply described and studied is this article. The principle, mathematics model and software's realization of fault calculation, protective relay setting and setting simulation is expatiated in detail. In the same time, the principle and realization method of graphic function for the system is analyzed too. An intelligent and interactive system of fault analysis, protection setting and simulation is established, which takes database as its core, applies the advanced technologies of visual programming, OOP, computer graph processing and modularization, combines the protective setting with fault analysis, and incorporates graphics, data and simulation together to implement the integrated design of protection setting and intelligent simulation for local power network. The overall software design and the function of each module is introduced. Finally, an example calculating the Chenzhou area power system protection setting and simulation shows the validity and the right of the system modern and program. By using of this system, it enhances the creditability of protection settings and ensures protection devices the selectivity, speediness, reliability and security.
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