Detect Transformer's Winding Deformation When Transformer Working

Electrical transformer is important and valuable electric equiment in electrical power system.It plays an important role in electric power's production and transmission. It's safely running related to electrical power system's stabilization. Transformer will occur kinds of accidents when it operaing in power line long time.If broken the loss is very high. In order to find hiddent rouble and avoid unexpected accidents, improve the safety of transformer running ,the study on the detection and diagnosis of transformer winding deformation is of practical and imminent significance.Windings are the most fault components of transformer and its damage rate is about 60%~70% of all the transformer accidents. Frequency response analysis method is a effectiveness way, it is wide-ranging used in many countries, but it is mainly off-line monitoring.Accidellt can't be fund in time.The article's aim is to study how to detecting the transformer's winding deformation with frequency response analyses,namely current supply instead of voltage source as the motivation. Because the transtormer's bus bar is big,so it is short out in high frequency,nearly no voltage.it is difficult to extract voltage signal on this condition,but comparatively, it is easy to extract current signal, so do many work for this in the article. The article have five chapter.The first chapter is exordium,it mainly show the meaning of the monitoring winding deformation, the actuality and trend of frequency respond analyses, and introduce many monitoring ways.The second chapter introduce the basic knowledge of winding. it will be used at next several chapters.The third chapter introduce the influence factor at site and frequency spot.The forth chapter introduce the change process of transformer winding with frequency rising. Afterwards, analyses the feasibility of current supply instead of voltage source as a motivation.The fifth chapter put forward two test model,and introduce some part of the model.The sixth chapter generalized the full text,and bring forward expectation.