Optimal Maintenance Decision of Power Transformers

This paper introduced the concept of Proportional Hazards Model (PHM), it took advantage of the Weibull PHM to establish the failure rate model of transformer maintenance based on condition monitoring information. The failure rate threshold through the maximum availability method was determined, and then the maintenance decision model for the electric transformer was established. Finally, we used a simple case, i.e. an analysis of gases in transformer oil, to illustrate the maintenance decision-making process based on PHM, and to verify the feasibility of this model for the transformer repair.