Research On The Detection Method Of Transformer Winding Deformation And Appropriate Instrument Design

Transformer is one of the main power system electrical equipment bears the voltage conversion,transmission of electrical energy in the power system.When subjected to sudden short-circuit transformer failure can cause the transformer winding deformation due to the degree of deformation is relatively small,so over a period of time can be safe to run,but it can also pose a safety hazard to the transformer,if not timely be testing and maintenance,with the growth of the running time,the transformer winding deformation will occur serious failures,resulting in a major accident transformer.Therefore,the deformation of transformer winding fault detection,timely discovery of the pitfalls as well as the degree of deformation,so arrange its maintenance,can effectively prevent the accident.In view of the existing methods of harmonic detection sensitivity low and long testing time and usually need several method to comprehensive diagnosis.This thesis analysises the frequency response method and the short-circuit impedance.when field testing has led to the thesis of the frequency response method,short-circuit impedance in-depth analysis.Paper proposes combining short-circuit impedance and frequency response method for transformer fault detection.During the test,the test winding of the transformer contralateral is shorted,continuously varying frequency signal is applied on the tested winding,at the same time get short-circuit impedance and frequency response curve of the transformer windings.MATLAB simulation results show that as the frequency increases,the opposite side of the test winding open,short circuit resulting frequency response curve of increasing overlap.So you can use a standard to judge the short-circuit impedance and frequency response method for transformer winding short circuit fault determination.At the same time combined with short-circuit impedance and frequency response of a test method to obtain spectral characteristics,you can also get short-circuit impedance characteristic information,so the amount of information contained in the test results richer compared to the short-circuit impedance method.By MATLAB simulation software to diagnose winding deformation paper presents a method carried out simulation proves that this method can simultaneously measure the short-circuit impedance and winding frequency response curve,while winding deformationobtain different frequency response curve changes.Finally,based paper presents measurement principle,the preliminary design of the winding deformation detection means.Through research papers,for improving power system stability,reliability and economy have a greater role.