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Condition-Based Maintenance of Protection Systems Based on Hierachical Fuzzy Evaluation

With the development of power grids, the disadvantages of traditional periodic maintenance of relays are increasingly obvious. Condition-based maintenance has become the reform trend of maintenance modes. An index set of relaying state based on the analysis of operational characteristics and data of condition monitoring is proposed firstly. The guard bay is taken as a unit and the status of protection device and the secondary loop are taken into account respectively. Secondly, aiming at the improvement of maintenance efficiency and quality, a state evaluation model of protection systems based on multi-level fuzzy comprehensive evaluation is built to form a maintenance strategy through data analysis. The case study shows that the method proposed is helpful for effectively assessing the operational status of relays, forming pertinent maintenance strategies and promoting the application of condition-based maintenance in protection systems.