Evaluation of transformer life in reliability and economic studies involves a changing life expectancy and failure rate. The relation of loading to temperature and insulation life is reasonably defined. The problem is to establish means of assigning values to added transformer life or reduced failure rates. A user can predict the return on transformer investment and the reduction in failure rates by use of relative aging and failure probability curves applied to the present age of existing installations
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P. Mann (1963) studied this question.
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