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Figure 5: Acid number versus Age for serviced and non-serviced transformers
In Figure 5, the acid numbers were investigated for much lower acid number compared to non-serviced
transformers that were recommended for hot oil cleaning, transformers (that were recommended for service). The
compared to those that received that service [6]. The average acid number for the non-serviced transformers
serviced transformers had the hot oil cleaning completed was 0.11 mg KOH/g, compared to 0.03 mg KOH/g for
and the non-serviced had no service completed. The trend the serviced transformers, showing the effectiveness of the
line in Figure 5 shows that serviced transformers have a service.
Figure 6: hot oil Cleaning and oil test results for a CARILEC member
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