Acidity Test (mg KOH/gr)

This test gives us information about the contamination, deterioration and aging of the oils. Like all industrial oils, transformer oils also result in an increase in the number of acids, especially due to the formation of carboxylic acids. In the presence of small metal particles acting as catalyst, the oil is oxidized under the influence of extreme temperature and oxygen. Sludge and varnish residues can also increase the number of acids due to the effect of temperature.