Novel Methods for the Condition Based Maintenance of Distribution Networks

The condition based maintenance (CBM) of high-voltage power supply systems provides many economic benefits compared to other maintenance strategies, if relevant data for the assessment of the assets condition are available. In order to collect them systematically, uniform checklists have been developed for different types of assets. They are used as input data for an expert system and a mathematical method, which allow the estimation of the assets condition by calculating normalized parameters. Although the basic approaches of the developed methods are quite different, their application on power transformers and circuit breakers lead to very similar results, so that both methods validate each other to a large extent. Part of the mathematical model is the consideration of uncertainty according to imprecise and missing datasets, so that a margin of deviation regarding the condition parameters can be determined.