基于Intel386EX的数字式保护硬件设计

利用 32位嵌入式微处理器Intel386EX ,构建了新型的保护硬件平台。该平台一改以往单CPU的处理模式 ,利用两个完全相同的CPU插件构成双CPU并行处理模式 ,正常时两CPU对同一组输入量同时处理 ,共同参与输出表决 ,任一CPU损坏后自动退出 ,由另一CPU独立完成所有保护 ,从而大大提高了硬件的防误动和防拒动能力。文中还从器件参数选用、看门狗电路、数据存储安全、I O冗余设计及校验、上电输出控制、装置故障信号等多方面作了充分的考虑。实践表明 ,所设计的硬件平台性能稳定、工作可靠 ,满足电力系统

Hardware design for digital protection based on Intel386EX

Based on 32 bit embedded microprocessor, a new hardware platform is designed. The new platform differs from single CPU processing mode. It consists of two same CPU boards, which process same inputs independently and make decisions together when both are normal. If one CPU board is in fault, it can exit service and the other can perform all the protection independently. This system can greatly improve the ability to prevent incorrect operation and miss operation. The paper also considers selection of components, watchdog circuits, data safety, redundancy design, checkout of I/O, control on power up and system fault. The practice has shown the new hardware platform is stable and reliable, and meets the demand of digital protection for electric power system.