微机保护装置中PLC功能的实现和应用

提出了一种结合电力微机保护和可编程逻辑控制器(PLC)2种自动化设备各自优点的新方法,从功能实现的基础上看这2种装置有很大的相似之处,具备互相融合的条件、一定规模的可编程逻辑,从而方便用户实现现场的复杂闭锁和特殊要求。分析了2种装置的软、硬件框架和实现方案,给出了PLC平台和传统微机保护平台的差别和合并的可行性,并介绍了在微机保护装置中增加PLC功能的具体方法,所有方案都在相应平台上做过测试。最后,介绍了西门子保护的PLC功能(CFC)及其应用模式的灵活性。

Realization and application of PLC function in microprocessor-based protection

A new method to combine both advantages of electric power microprocessor-based protection and PLC(Programmable Logic Controller) is proposed.According to function realization,two equipments are similar,which makes their aggregation possible,and both contain programmable logic,which easies the realization of complex interlocking and special requirements on field.The software and hardware structure and realization schemes of both equipments are analyzed,as well as differences between PLC platform and traditional microprocessor-based protection platform are described.The feasibility of their aggregation is given and the method of adding PLC function in protection is proposed.All schemes are tested on relative platform.The PLC function CFC(Continuous Function Chart) of Siemens protection and the flexibility of its application mode are introduced.