A guide for transformer replacement based on reliability and economics

Measurement of system and product reliability has become important both in the purchase of new transformers and for the evaluation of existing equipment. The authors provide a guide to making a purchase decision on transformer replacement based on a reliability and economic evaluation. It is concluded that reliability should be included as a factor in the decision to replace or refurbish older transformers. An example of the economic analysis used in the case of replace/refurbish is presented. The key to using reliability as a planning aid is gaining enough data to generate confidence in the results. The sampling methodology presented can be used to obtain data which can be useful in the analysis of future system needs