2、件的系统设计，主要分三部分：一是数据采集处理模块，二是人机接口模块，三是数据采集处理模块与人机接口模块的通信设计；其次在软件方面，讲述了各功能模块的软件设计流程，主要包括主循环程序、中断子程序以及故障处理程序；最后简单叙述了差分滤波器的设计，故障类型的判别和微机保护的算法。 关键词：变压器差动保护DSP差分滤波器傅氏算法The Preliminary Design of Microcomputer Protection System ofPower Transformer Based on DSPAbstract Power tr
3、ansformers are important facilities in power system. They are used inelectricity generating distribution and other aspects of power system. Their safetyrunning determines whether the whole power system can operate steadily and continuously. So high-performance and sec
4、ure relay protection sets are needed forpower transformers. Especially microcomputer relay protection sets, with software’s agility, find a wide application in protection of power transformers.In this paper, a microcomputer relay set for power transformer is designed
5、under summarizing the protection theory. Firstlythe paper introduces the features of all kind of chips used in hardware design，and then specifies the system design of the hardware, it contains three parts: Firstly, Data Acquisition Processing Module, and second, Human
6、-computer Interface Module and the third is the communication design of Data Acquisition Processing Module and Human-computer Interface Module secondly, on the software side, describing the process of software design of various functional modules ,mainly includes the
7、 main loop procedure, the interrupt routine and fault handling procedures; Finally briefly describes the design of the differential filter, the discrimination of fault types and the algorithms of Microcomputer Protection.Keywords: transformerdifferentialprotection DSP
