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Figure 3: Average Service life as a function of the number of oil services
The same data used to create Figure 3 was analyzed in a longer service life than non-serviced transformers. Figure 4
different way [6] to create Figure 4. In Figure 4, the service shows a shift to the right in the life distribution of serviced
life of the serviced transformers was taken as a whole, transformers, indicating a longer life compared to non-
regardless of the number of services performed on the serviced transformers. The size of the shift is an average of
transformer. The service life distribution in Figure 4 indicates 8.4 years of extra life for the serviced transformers.
that on average, serviced transformers tended to have a
Figure 4: Service life distribution of serviced and non-serviced oil filled transformers
industry Journal 23
