Study On Application Of ARM Microprocessor For Power System Line Protection

With the rapid development of national economy, the scale of power system becomes larger and larger, and its structure gets more and more complicated. Because of the influence of man-made or nature factors, some faults results in the system out of action, which always happens. Therefore, it is an important task to guarantee that the electric power system runs in safe reliability, and improve the quality of power energy. The relay protection system is an automation system that can detect the fault and deviant state of electric power system, and drive the breaker's action or send out the alarm message. The role of protection relay system is to cut off the fault module in automatic, rapid and selective manner so as to avoid destroying system.Microcomputer protection system is the fourth age of relay protection system. Nowadays, it has become the main research subject in the domain of relay protection. The paper puts forward a universal ARM9 platform of microcomputer protection system based on comparison research of the traditional protection relay system. The paper introduces the principle and the model of the system detailedly; analyzes the hardware design principle based on the 32bits embedded microprocessor AT91RM9200 produced by Atmel Corp; shows the schematic circuit diagram. At the same time, taking the example of 110kV line protection, discusses the system configuration, sofaware design and relevant anti-jamming measure.Microcomputer protection system designed in this paper has such characteristics as network, intelligence and integrated automation, and provides a variety of communication ways which possess high reliability and the ability of extensibility; the microcomputer protection arithmetics selected take on two excellences of the rapid speed and the high precision; the measures to restrain EMI (electro magnetic interference) enable the system to own nice EMC (electro magnetic compatibility).At present, the system has got through test; the preliminary running effect shows that the design is successful. It has fast response and correct communication, its performance and function meets the designed requirements and target. Along with the development of the computer thchnology, the microcomputer protection device based on the embedded real-time operating system will become the main developing direction of relay protection based on microcomputer in power system.