MAINTENANCE approaches of high voltage
transformers in the field have been developed over recent
years. There are several traditional approaches employed for
transformers, either corrective or time based preventive
maintenance strategies have been generally implemented [1].
The corrective strategy involves implementation of
maintenance once the power station or substation has failed to
operate. The advantage of this type of maintenance is that it
does not require any decision tools. However, using this
approach will cost the operator a significant amount to replace
the asset once it has failed. Meanwhile, time-based preventive
maintenance can be implemented and has advantages over
corrective strategies due to the fact that assessment of