Study On State Monitoring Of Transformer On Vibration Analysis

The article has made the analysis and the summary for the traditional failure diagnosismethod of transformer. The traditional failure diagnosis methods all examine transformer’scondition depending on some parameters, such as the inductance, the mutual inductance, theelectric capacity, the gas which the insulation aging produces and so on. These electricalparameters and oil and gas parameters are indirect manifestations, which are caused byloosening and deformation of the transformer internal structure. The method of vibrationanalysis is to directly detect the vibration signal, it can discover the internal hidden faults oftransformer in time, which is a strong complement and consummation for the traditionalonline monitoring and fault diagnosis system of transformer.This paper started with the transformer structure and working principle, it summarizedthe common fault and its reason of the various parts of the transformer. And it emphaticallyintroduced the detection method of winding and core failure, and analyzed the advantages anddisadvantages of the existed fault technology.On the basis of this, this article using vibration method, taking the transformer windingand the core as the research object, analyzing the cause of winding and core vibration and itsinfluence factor. With winding mathematical model, illustrating the winding force and therelationship between winding vibration acceleration amplitude, frequency and load current;by analyzing of magnetostrictive phenomenon of silicon steel in the magnetic field, clarify therelationship between the core vibration acceleration amplitude, frequency and supply voltage.In addition, it has completed the design of vibration signal acquisition system byselection and installation of sensor, selection of data acquisition card, and the design ofacquisition system anti-jamming measures with acquisition system. And it respectivelymeasured the tank surface vibration signal of the running three-phase transformers andsingle-phase transformer tank surface.At the end of the article, by analyzing the vibration signal transmission of core and thevibration model of tank surface and combining with the application of blind source separationtheory in the vibration signal separation, it discussed the Joint Approximate DiagonalizationAlgorithm and made a simulation experiment and analysis of the signal separation for thealgorithm by the tank surface vibration signal.