Research And Analysis Of A Testing Device Measuring The Character Of The Power Wave Trap Coil And Coupling Filter Based On FFT And Correlation Theory

The technology of power carrier systems is used in power system and the power carrier communication of electrical railway widely. For examples, the automation of distribution system, the automation system of meter reading and carrier telephone, especially in the high-frequency protection of power system. Adopted high-frequency protection as the main protection of circuit extensively in the our country 220 kVs and the above circuit currently, the position was very important. There is movement to statistics enunciation, the high-frequency protects of inaccuracy action, is mainly carried an iniquity of passage equipments by high-frequency to often work causable of. Therefore, the intact which promises the high-frequency carries a passage equipments is the foundation premise that the high-frequency protects a dependable work.This text opens a structure which introduces high-frequency first to carry the equipments-electric power of a passage power wave trap coil and coupling filter and their constitutes, and they carry a function in passage in the electric power line, to both of the characteristic parameter carry on measuring accurately with periodical check, then can promise the electric power carries a correspondence to work normally.Two kinds of characteristics which put forward signing FFT frequency chart analysis method and related method principle according to the trap coil test a project, tallying up a set of practical electric power wave trap coil and coupling filter characteristic the calculation formula of the parameter. Two kinds of projects all asked for help from MATLAB to imitate to really confirm their usefulness, and analyzed their merit and shortcoming places.Combined with system design require characteristic of DSP, the hardware design and software design of device are discussed. As to hardware, the controlling and processing center are TMS320LF2407A,this testing system applies many novel digital technic, such CPLD, DDS, high speed A/D, which elaborate the cell-type signal generator and broad band data acquisition and high speed cache etc.Adopted C language and edit collected materials the plait distance of language mixture method at the software aspect, made use of to edit collected materials advantage and the C language vivid and simple advantage that the language is suitable for a FFT operation well. The software drew up to adopt a mold piece the way for turning, combining the mold piece of different function for whole. It gives in the text system main program design frame diagram, clarified to weave distance thought and procedure structure, adopt the FFT calculate way of improvement type, and use INT to save DSP'space, make the procedure circulate more efficiently fast.The research of this topic, make the theory of measuring trap coil and coupling filter more complete and practical, and equip to the system of developed to carry on thorough thin turn, thesis end to the item that this topic involves and still need the aspect of further improvement, carried on tallying up systematically.