Design And Implementation Of DTU Teleindication And Telecommand Unit Based On ARM

As people have more and more high demand of the power quality, the supply reliability of power distribution network attracts more and more attention. DTU is the important component of distribution network, its teleindication unit and telecommand unit complete real-time monitoring function of running equipment in the power distribution system. The reliability of teleindication and telecommand directly influences the power quality. However, during power grid operation period, teleindication often appears false alarm and telecommand often appears maloperation. These will bring us the direct economic losses and even may lead to huge power accidents. In order to solve the above problems, this paper puts forward the design of DTU teleindication and telecommand unit based on ARM.First of all, this paper studies DTU teleindication and telecommand technology, confirming specific design aim and functional requirement. After completing the whole design of teleindication and telecommand unit and the partition of soft-hardware, the specific soft-hardware design and implementation are elaborated. The hardware design adopts multiple boards’ solution, including CPU board, teleindication and telecommand board, LCD board. Teleindication and telecommand board is hot-plugging and configures flexibly. It can meet the different requirements of power distribution occasions. CPU board uses i.MX287 processor based on ARM9 core. LCD board and teleindication and telecommand board use ARMv7 architecture’s 32-bit STM32F103 VE processor. Multi processor has the characteristics of fast response speed, high accuracy and good stability. The teleindication and telecommand’s circuit uses two stage isolated optocoupler to improve counter-jamming performance. Software design uses modularized scheme, including software design of CPU board, teleindication and telecommand board, LCD board. The whole software design adopts the development of embedded technology, teleindication technology, telecommand technology etc. According to IEC60870-5-101 power protocol, using the idea of multi-threaded programming based on asynchronous serial communication and CAN communication, finally realizing the distribution monitoring functions, such as teleindication, telecommand, SOE, data conservation and uploading, time setting, display and communication and so on.At last, completing the whole design of the soft-hardware and testing teleindication and telecommand unit’s functions. The test results show that the design of teleindication and telecommand unit meets the desired goal and has a certain application value.