Study On Evaluation And Condition Based Maintenance Strategy Of 10kV XLPE Cable Status

With the rapid development of social economic development and power system, distribution network, the application of XLPE cable is more and more widely. In recent years, the large-scale use of cable makes the operation management of cable is more important, the cable fault rate is directly related to the safe and stable operation and fault distribution rate. It has important meaning and use value of cable condition evaluation and maintenance strategy.In view of the existing operation and maintenance of distribution of lOkV XLPE cable in question, this paper has conducted the research from four aspects of the. First of all, research on cable defect analysis and fault diagnosis method. The aging of the material reason is various, complex insulation, aging can be divided into non electrical aging and electrical aging, non electrical aging mainly include:thermal aging, mechanical aging, light aging, cause specific analysis of various defects, and the defects of branch cable structure. Then, analysis of fault types of cable defects, including short circuit fault, open circuit fault, flashover fault, compound fault etc.. Then, analysis of cable prevention trial and the online monitoring method, including preventive test insulation resistance test, pressure test, impulse current test, dielectric loss measurement test, online monitoring methods including DC component method, DC superposition method, dielectric loss on-line monitoring, partial discharge online monitoring method, low-frequency superposition.Secondly, study information fusion technology in the cable insulation monitoring applications. Through the research on the formation, the information fusion technology principle and characteristic, application field, algorithm, the framework of cable insulation diagnosis based on information fusion is proposed.Secondly, study information fusion technology in the cable insulation monitoring applications. Through the research on the formation, the information fusion technology principle and characteristic, application field, algorithm, the framework of cable insulation diagnosis based on information fusion is proposed.Thirdly, research on cable status based on information fusion technology assessment model. Study on cable status based on information fusion technology evaluation model, fiizzy theory and analytic hierarchy process based on the model. The cable prevention test information, family defect information, online monitoring information and the operation condition information through fuzzy get the index under the membership degree analysis, work out the membership function of the four type of information, get the type information of membership, then, to confirm the weight of every index by the analytic hierarchy method, four types of information for decision level fusion, obtain comprehensive state cable score.Finally, the state assessment model applied to the actual cable condition assessment, case analysis. According to the specific line, applying the above model for condition assessment, a comprehensive analysis of the cable, the formulation of condition maintenance plan. At the same time, the evaluation model to carry out verification and further research of evaluation system for the next step of the perfect plan.