Design Of Distribution Transformer Terminal Unit Based On UClinux

With the rapid development of our country's economy, the demand for energy is growing. The safety and reliability of power distribution network has become more and more important. It is vital to millions of households the use of electricity, particularly with the gradual establishment of the electricity market, the quality of electricity supply as a city of the important parameters, monitoring to the distribution transformer working parameters is the base to realize the distribution. So the level of distribution transformer monitoring is one of the major standards to measure the level of distribution automation. uClinux is derived from Linux and inherits lots of virtues of Linux such as open source, it has special implements in the case of not having MMU and supports wide range processors and many drivers.A new design of intelligent distribution monitoring terminal was proposed in this paper. The new design is based on the analysis of the current situation of distribution power system, the needs of distribution automation in our country and the international and domestic TTU research.This paper presents a transformer monitoring terminal design plan which is integrated function-meter and communications features based on uClinux embedded operating systems, dual-CPU architecture. In hardware circuit designing, the control panel used the 32-bit embedded microprocessors AT91M40800, all isolated standard RS485/RS232 communication interface and LCD display Chinese characters to design. ATT7022B is adoped in power meter data acquisition based on DSP thchnology and used multifunctional three-phase energy metering. In the aspect of software programming, this paper discusse the establishment of system development environment, including bootloader program design, the replant uClinux, establish file system and device driver design, programme modules-applications on terminal.Through debugging and working, the terminal has high accuracy, small size, light wight, low power consumption, easy to operate,various technical parameters to meet《GB/T 17883-1999》《GB/T 17882-1999》《GB/T 17215-2002》《DL/T 614-1997》《DL/T 645-1997》national standards and industry standards. And it makes appropriate to the field of automation and electric energy measurement, which is better to the present domestic power networks.