The Simulation Of Transformer Winding Deformation And The Design Of Dual-CPU Architecture Tester Based On Frequency Response Method

As one of the important devices in the power system, the safe operation of atransformer plays a very important role in the protection of the security of the powersystem. While the transformer winding is a main part of the transformer fault, therefore,the development of a high-performance transformer winding deformation tester, has a veryimportant practical significance for the detection of transformer winding deformation,transformer accident prevention and extend transformer life.At present, three methods are mainly used at home and abroad to detect thetransformer winding deformation, they are short-circuit impedance method (SCR),low-voltage pulse (LVI) and frequency response method (FRA).Because the short-circuitimpedance method and low-voltage pulse have many shortcomings such as low testaccuracy, poor anti-jamming capability on-site, long measurement time and a poorreproducibility, so in this study, the frequency response method is used as the theoreticalbasis of detection to research the transformer winding deformation tester and simulationanalysis.In this paper, the main research content is the simulation of transformer windingdeformation and the design of dual-CPU architecture tester based on frequency responsemethod. It is divided into six chapters to introduce. The first chapter introduced theresearch background and current situation of the transformer winding deformation tester,and compared the existing research methods. In the second chapter, the structure and theforce conditions of the transformer windings were first introduced, and then, the equivalentmodel circuit of transformer winding deformation based on frequency response methodwas analyzed. At last, the influence of common power system fault on transformer windingwas elaborated. In the third chapter, Using the modular design concept to design thesystem hardware of the transformer winding deformation tester which used DSP and ARMas the core, besides, each module of the circuit was designed respectively. The fourthchapter introduces the software design of the tester, including the software design of theDSP processing module and the ARM control management module. In the fifth chapter, thePSPICE software was used to simulate the equivalent model circuit of the transformerwinding. And curves and statistics were analyzed when we changed one parameter ormulti-parameter of the equivalent model circuit. This part also studied the impact ofvarious parameters on the different bands of frequency response waveform graph, thenaccording to the calculation formula of the parameters, found the changes of thecorresponding parameters when there were different fault performances, and finally,launched the relation between waveform and possible fault type. The sixth chaptersummarized the full text and prospected for the development of this technology.