Over time the oil is exposed to mechanical and electrical stress as well as to chemical contamination. When the functionality is reduced it can lead to power outages. To maintain and extend the life of the power transformer and to avoid severe breakdowns, regular testing of the transformer oil is very important. Transformer oil testing is done as per (IS 1866). The following test are conducted:

  • Electric Strength (Break Down Voltage)
  • Water Content (PPM)
  • Tan Delta/ Dielectric Dissipation Factor
  • Resistivity
  • Total Acidity
  • Inter Facial Tension (IFT)
  • Sludge Content
  • Flash Point
  • Dissolved Gas Analysis (DGA)
  • Color & Appearance
  • Pour Point
  • Density
  • Kinematic Analysis
  • Furan Analysis


We provide on-site Oil Sampling for the purpose of Laboratory Oil testing & Analysis. Just as a blood test provides a doctor with a wealth of information about the health of a patient, a sample of transformer oil, taken correctly, can tell service engineers a great deal about the condition of a transformer. AEI Service engineers have been trained in the strict routines needed to obtain a clean sample n accordance to IS 1866 .