Study On Transformer Terminal Unit Based On MSP430F449

The Distribution Automation System is an information management system based on computer technology, automation control technology, data communication technology and correlative electric power system technology. Being the import unit of the Distribution Automation System, the Transformer Terminal Unit namely TTU ,samples AC input(such as voltage, current and so on) and state(for example: switch state) and executes remote control command(open operation or close operation), TTU supervise the action of transformer ,so it guarantee the security of DAS(Distribution Automation System)This paper is mainly based on the study of Transformer Terminal Unit based on MSP430F449 SCM, The work of this paper includes: first, introduces the design of the hardware system and the software system of TTU, the core mathematical principle, and then, Discusses the implementation of the communication protocol:IEC870-5-101 and I2 C in detail. This TTU does well in such sides as: real time data sampling and processing, digital signal input and output, communication with PC and configuration.The TTU adopts RS232 standard, has good real time quality, and can be configured easily and conveniently by PC, so it has high popularizing values.