Application of the DSP technology in feeder terminal unit (FTU)

In this paper, a type of feeder terminal unit that adopts 16 bit fixed-point DSP TMS320F206 as its core is developed. The DSP has good features of low price and high data processing capacity that is 20 MIPS (Million Instructions Per Second), which are fully used by the FTU to improve its performance. Some algorithms are adopted in software to realize AC synchronized sampling which greatly simplify the hardware design and enhance the measuring accuracy. This type FTU puts together such functions as protection, control, measure, communication, display, etc. Further more, it supports multiprotocols and can constitute a fully integrated distribution system with various on-pole switches. Compared with other FTU constituted with general microprocessors, this feeder terminal unit based on DSP technology possesses features of lower power consumption, higher real-time processing speed, higher measuring accuracy, smaller volume and higher stability, and its function can be extended more easily.