| The steady operation of power system has already become one of the important factors that affect the fast stable development of national economy. Meanwhile in the power system, the equipment of relay protection is of vital importance to guarantee the secure and steady operation of the power grid. Nowadays, the intricacy and diversity of structure of power grid urges the specialized need for relay protection. Thereby, many a specialists over the world carry out researches on the equipment of relay protection.In the protective exploration, there often exist these two common problems: in one hand, it would take piles of human and material resources to realize the change of hardware, for the reason that the present development mode adopts the physical bottom layer; in the other, the coupling amongst the modes is so powerful that it is hard to accomplish or even worse, when it comes to adjust certain functional mode to meet the needs of specific power grid.The visualized development platform of relay protection in power system synthetically utilizes the configuration, modern digital protection, digital simulation and virtual instrument technology with an aim to provide the foundation for the specific development of relay protection. The platform , via protection on every functional release coupling , achieves the separate of each mode to make it easier to develop and update each mode in the protection. On the one hand, the development cycle of relay protection is shortened and human and material resources are saved; on the other hand, it's convenient to satisfy the individual demand of the equipment of relay protection in power system. Lastly, due to the visualization characteristic of this platform, it can be easily applied to explore new algorithm or principle of relay protection, to evaluate the adaptability of current principle for special power grid and also have application in the analysis of relay protection action after the power grid accident. Compared with the current computer emulation system of relay protection, this system has the following merits:1. based on virtual instrument technology,2. transient simulation and testing, 3. integrated,4. configuration,5. the visualization and transparence of the simulation makes it possible to observe the process and inner operation of the protection,6. protective evaluation.The paper is aimed at integrating Labview and ATP, that is: first ATP implements Fault Simulation, and Labview achieves Protection Simulation; next, the system adopts the technology of software framework to build software model of digital protection; finally, in the Virtual Protection Simulation System, the Physical Protection Device is simulated so as to realize the visualization and transparentization of the Protection course, which convenience the research on new theory and algorithm, the analysis on the incorrectness of the Protection, and the evaluation on Protection action. All of these consist of the Dynamic Protection Simulation and Testing System which are wholly based on virtual instrument. The module design of the system, which is open, visualized and in high integrated level, gives priority to observe the inner action of the Protection, and analyze dynamic features of relay protection instrument.Additionally, the system employs the full-scale automatic testing of protection system. The virtual instrument can make parallel joint with the real protection equipment (i.e. the protection equipment to be tested), which could take the virtual instrument as base, and verify the experimental device.
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