Development of Condition Health and Risk Index of Transformer Population

Asset manager faced a challenge in managing their transformer population as majority of the units are in aging state condition. In addition, they are also pressure by the stakeholder to reduce the maintenance cost while need to maintain the same transformer reliability. Thus, a systematic maintenance approach needs to be developed to assist asset manager in prioritizing the maintenance task, optimized operation and maintenance cost and at the same time avoid unplanned outage of the transformers. This paper presents the development of Condition Health Index (CHI) and risk index to facilitate the management of transformer population at petrochemical plant. The overall health condition of 100 transformers were assessed and identified using combination of health index and risk index. Finally, the strategic maintenance actions on the transformer population were determined either require maintenance actions or continue for normal operations.