Design of computer-based dual-CPU relay test device

With the rapid development of the electric power industry in our country, new relay protection equipments especially microprocessor relay protection equipments have been widely applied in power system, which has a higher and newer requirement to the corresponding relay testing technology. The exploration and application of microprocessor relay protection testing equipment have a great active significance to improve relay testing level, prevent incorrect action of relay protection and automation equipments and ensure the safety operation of electric network. In the paper, the structure and principle of the whole testing system are introduced, the hardware and software of the microprocessor relay protection testing equipment are designed based on modular structure method. The designing rule and the programming method of the whole software are also set.