3.1.4. Step D: Prioritization

One or more prioritized actions can be selected among the possible actions indicated in step C. Analyzing all these actions shows that the third action received a lower priority due to the requirements of an economic plan to evaluate the return on investment of recycling several tons of waste oils. The first and second actions are the highest priority to the PSMD power plant in order to accomplish the sustainable vision, due to the following strategic guidelines:


• Cost-effective and good return on investment.

For achieving the first prioritized action, a numerical method for early fault detection was developed to define the correct time of carrying out corrective action before the measured value of a measurable variable exceeds its caution limit (see Section 3.2 for details). Furthermore, a model for early fault diagnosis was created based on this numerical method to follow up the fault's progression during the useful life of the transformers, see sub-Section 3.3.

Regarding the second prioritized action, the lack of competence in sustainable maintenance can be a source for improper maintenance. According to a case study in [35], 40% of the breakdowns of eight Swedish manufactures were due to improper maintenance. It is important for the PSMD power plant to provide training on sustainability for the maintenance team to increase their competence in the sustainable maintenance.
