变电站自动化系统中事件记录时的问题分析及解决方案

根据有关变电站自动化系统中事故记录的国家标准和电力行业规范，讨论了事故记录多级显示中产生错位及遗漏问题的原因，并提出了比较有效的解决方案，即当核心处理器CPU1检测到第1个事故后延时一段时间后再传送给处理人机交互的处理器CPU2；或当液晶显示得到事故记录更新信息后延时一段时间后再请求CPU1发送事故记录；或上述两兼而有之。中还介绍了计算延时时间的方法。根据该方案设计研制的系统已在变电站中投运，效果较好。

ANALYSIS AND SOLUTION OF ACCIDENT RECORDING IN SUBSTATION AUTOMATION

The missing of accident records and the disorder of their record sequence appearing in the liquor crystal display screen of control and protection unit is analyzed. The reason of this phenomena is that when a group of accidents takes place in succession, the intersection between the two logical threads of accident refreshment and record transmission occurs, thus, the record being transmitted is not the latest record, in reverse, when a single accident appears, only an old record has been refreshed and the new record just begin to transmit, therefore, there will be not any intersection between the two threads. On the basis of the above analysis, an effective solution is put forward as follows: when a group of accident signals are detected in succession by the kernel processor CPU, after a certain time delay, i.e., all of the information of these accidents are completely acquired and refreshed, the records just begin to transmit to the liquor crystal display, thereby, the intersection between different threads is avoided. For liquor crystal display the just received accident records are not displayed at once, but ask the kernel processor CPU to send the records again, then display them. How to calculate the time display interval is described. A system based on the above analysis is put to use in practical substation and good effect is revealed.