The insulation oil of voltage- and current-transformers fulfills the purpose of insulating as well as cooling. Thus, the dielectric quality of transformer oil is a matter of secure operation of a transformer.
As transformer oil deteriorates through aging and moisture ingress, transformer oil should, depending on economics, transformer duty and other factors, be tested periodically.
Transformer oil testing sequences and procedures are defined by various international standards.
Power utility companies have a vested interest in periodic oil testing since transformers represent a large proportion of their total assets.
Through such testing, transformers' life can be substantially increased, thus delaying new investment of replacement transformer assets.
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