Research on Transformer Incomplete Repair Strategy Considering Proportional Hazard Model

In order to consider the incomplete maintenance problem into the transformer state maintenance strategy, this paper proposes a transformer state maintenance strategy based on the proportional strength model. First of all, this paper establishes a transformer proportional strength model, and gives a detailed calculation model of incomplete maintenance parameters in the proportional strength model. And this article has determined its reasonable value range and clarified the overhaul effect of incomplete overhaul activities. Secondly, this paper uses the least cost method to determine the condition maintenance threshold curve of the proportional strength model, and adds the lower limit of the threshold as the restrictive index of the condition maintenance strategy. Then, this paper uses actual transformer fault statistics and condition monitoring data to carry out a calculation example analysis. Finally, the effectiveness of the proportional strength model in the case of incomplete overhaul is verified through the analysis of a calculation example, which provides a reliable theoretical basis for the decision-making of the transformer's condition overhaul.