The Research On Mc9s12x-Based Small-Scale Soe(Sequence Of Events) System

With the growing scale and complexity of the power system,it is necessary to promote the technology of automatic control and monitor of power system. When the accidents of the power system hanppened, it is hard to resolve the sequence of the events at the short time because of much information appears. How to correctly identify equipment action sequences will be related to resume the normal operation. The thesis develops a set of small-scale SOE which can achieve data acquisition for 32 switching units with 1ms resolution.This article introduces the design methods of hardware and software on SOE system.16-bit HCS12X of Freescale Company is adopted as the core of system. SOE system has the functions of display of scene data and the record of failure. The using of FRAM enlarges the capacity of the system, and makes the record of failure. By applying of the RTC (Real-Time Clock) and PIT (Periodic Interrupt Time) modules, system has the function of resolution of milliseconds. Through the CAN bus, RS485 bus, the Ethernet, the scene data have transmitted into the host computer. In software part, the article describes in detail the switching units program, Ethernet program, CAN program and RS485 program.In the experiment, the system is verified through the oscillator of SOE system itself. The results show that the system can achieve data acquisition of 32 switching units with 1ms resolution. From the experimental results, it can be seen that the system can actually record the state changes of switching units, which can provide a reliable basis for the further study of failure analysis in power sector and other related industries. Finally, the article summarized the design and production of SOE system, pointing out where shortcomings exist and it can be improved.