Variation of Electrical-magnetic-acoustic Characteristic Parameters During the Development of Oil-pressboard Insulation Discharge Under AC Voltage
Surface discharge is one of the most serious types of discharge faults in transformer oil-pressboard insulation structures.In order to accurately obtain the changes in characteristic parameters during the development process of oil-pressboard insulation surface discharge under AC voltage,a simulation experimental platform for the development process of surface discharge was built and a measurement system which can meet the synchronous online monitoring re-quirements of electrical,magnetic,and acoustic physical quantities during the discharge development process was established in this paper.On this basis,typical features of multiple physical parameters during the development of surface discharge were extracted;moreover,by analyzing the amplitude changes of characteristic parameters throughout the entire process,the discharge process was divided into stages,and corresponding stage characteristics and mechanism overview were provided.The experimental results indicate that,by means of analyzing the typical characteristics and variation pat-terns of multiple parameters,the development process of surface discharge can be divided into four stages,namely,micro energy discharge stage,low energy discharge stage,high energy discharge stage,and near breakdown stage,and the stage characteristics are related to charge distribution and insulation material resistance strength.Compared to conventional single parameter monitoring methods,a more reliable and accurate reference evidence for transformer surface discharge fault diagnosis and timely warning is provided by the multi-parameter synchronous detection method.
万方数据
维普
