New and in-service mineral insulating oils may contain substances that cause corrosion under certain condition of use.

The primary purpose of the test is to determine if any corrosive sulfur compounds in the oil will react with the copper strip.

The DGA test detects various gases that are dissolved in the insulating oil. The amount of gasses is measured in parts per million (PPM) and will indicate the types of stress wether thermal or electrical, that occur within the transformer.

This test method has been used to successfully test for furanic compounds in mineral insulating oil, silicone fluid, high fire point electrical insulating oils of mineral origin, askarels, and perchloroethylene-based dielectric fluids.

The Oil Power Factor Test measures the leakage current through an insulating oil. The test also determines dielectric losses of the oil or the energy that it dissipated as heat insulating materials.

The DBV Test determines the strength of an insulating oils sample to withstand electrical voltage without failure. Contaminants such as moisture or particulars can compromise the insulation properties of oil.

The IFT or Interfacial Tension measures the tension between water and oil at the point of interface. The IFT test determines the presence of oil decay products and soluble contaminants from solid insulating materials.

Even in minute quantites, water or moisture is extremely dangerous power equipment. Moisture accelerates the deterrioration of insulating oil and paper insulation.

The transformer oil color is determined by passing a beam of light to determine transparency and identify foreign contaminants. Contaminated oil shows poor transparency or visual evidence of foreign particles. 

Acid Number Test is used to determine the total acid value of the transformer oil. As acid value increases, the insulating quality of oil decreases.

ASTM D1169 is the standard test method for measuring the specific resistance (resistivity) of electrical insulating oils. This test is crucial for evaluating the insulating properties of transformer oil, ensuring optimal performance and longevity of transformers.