| Based on the research of the project of the diagnosis of deformation of power transformer windings, this dissertation discussed a type of instrument that is capable of doing the site investigation of deformation according to the theory of Frequency Response Analysis in the view of deformation of transformer in practical operation. It performs an extensive and in depth research theoretically and methodologically on this topic, the deformation of transformer windings.This dissertation consists of seven chapters. Chapter 1 is a general introduction. It illustrates the meanings of deformation of transformer windings and discusses the cause and effect of such deformation. The purpose and significance of the research is also discussed in chapter 1. And it points out the primary problems and introduces the contents of this dissertation.In chapter 2, it discusses the domestic and international researches at present on deformation of power transformer windings. It also discusses various means and puts forward the Frequency Response Analysis Method after a meticulous comparison.In chapter 3, it discusses the development of the instrument, Tester of Deformation of Transformer Windings, which is based on DSP. It introduces the theories and structures of the whole system, elaborates the realization of broad band data acquisition and high speed cache and the design of sweep frequency generator based on DDS (Direct Digital Synthesis) technique. It also explains the principles of USB (Universal Serial Bus) communication, the characteristics of its protocol and the DMA (Direct Memory Access) communication method.In chapter 4, it discusses the research on the technique of parallel process of multi DSPs. The author designs a master-slave structure based on two DSPs associating with this system.In chapter 5, it discusses the software designing of this system. It mainly explains the FIR filtering and FFT algorithm.In chapter 6, it discusses investigate methods for obtaining FRA resultsand analysis strategies. Validate the function of systemIn chapter 7, it summarizes the main achievements of this dissertation. |
