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Survey of the literature allows concluding that each power system has to develop its own individual strategy for power transformer risk assessment and development of risk matrix is a common global practice.To determine numerical values of the indicator based on oil analysis combined approach of binary and fuzzy logic proved to be successful since it allows evaluating risk based on several oil parameters as a single entity. Results from the case study confirms that higher output value corresponds to the transformers that have already attracted-engineers’ attention. Further development of the risk assessment methodology continues with the indicator for power transformer electrical measurements.
