| Substation's control and signal system play an important role in the safe, economical running and operation management of the substation, especially for the daily running and control. The digital simulation for the system is really significant for the design of the substation, for the combinative optimization and testing of various protections, and even for the substation's training simulation.To realize the visibility and commonality of the simulation, many graphical controls, which represent all kinds of actual devices, are constructed to plot the drawings of substation's control and signal system. The sensitive areas of hotspots are used to enable the neighboring controls to connect together automatically and exactly. The connected relations of graphical controls, devices and electrical components are analyzed on the basis of the drawings, and as a result the common simulation model of the control and signal system for substation is established. Because of the fact that the model is made up of many self-governed modules and lots of on-off electrical components, such methods as equivalent-node, separate-module and treetop-elimination are applied to decrease the number of nodes and the dimensions of corresponding matrixes, and largely increase the speed of the simulation. The method of partial modification is adopted to prevent the simplification from being ineffective as the result of the varying states of on-off electrical components. Thus, the dynamic analysis of the substation's control and signal system are obtained.The models of those intelligentized devices are constructed distinguishingly in this paper, in which import circuits and output circuits are put apart to communicate with other devices. Some attempts in distributed calculating have been made to further increase the speed of simulation. After the strategies of assignment being set down, the technology of socket is adopted to realize the communication among different programs.
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