Research and Development of Insulation State Detection Based on Polarization/depolarization Current
Polarization/depolarization current method is a very important detection method for electrical equipment insulation,which has been widely used in the state detection of transformer oil-paper insulation and cable crosslinked polyethylene insulation,and many advancements have been made.To obtain the research advancements in this field,this paper introduces the principle of polarization/depolarization current measurement,on the basis of it,it reviews the research in this field from three aspects including detection system,insulation equivalent current identification and insulation aging and damping status detection,and points out the advancements and limitations.The results reveal that the existing detection system can essentially meet the requirements of actual polarization/depolarization current measurement.As long as the appropriate initial solution of variable is selected,based on the least-squares fitting method and the appropriate optimization algorithm,the objective function of insulation equivalent circuit identification can usually converge to the optimal solution.However,how to adaptively determine the optimal number of branches and the initial value of each branch parameter is a topic that needs to be studied in the future.According to the indicators of polarization/depolarization current,the insulation aging and damping degrees can be evaluated qualitatively and quantitatively,but the generality of the evaluation formula needs to be further checked and improved.The polarization/depolarization current measurement results are affected by many factors,therefore it is necessary to suppress interference in the actual measurement,and consider the standardization of the relevant measurement parameters to increase its practicability.
万方数据
维普
