Insulation Fluids Tests

ENPAY offers advanced diagnostic tests on insulation fluids for electrical equipment.

• Oil Compatibility Test of Materials Aged in LiguidDielectrics
• Water Content Coulometric Karl Fischer Titration -|EC60814
• Breakdown Voltage - IEC 60156
• Permittivity - IEC 60247
• Dielectric Dissipation Factor (tan 6) - IEC 60247
• D.C. Resistivity - IEC 60247
• Acidity - IEC 62021-1
• Sludge Formation - IEC61125
• Interfacial Tension of Oil against Water by the Ring Method - ASTM D971

Dissolved Gas Analysis (DGA)

Power transformers are designed to have a long operational life. Since the level of power is high, the efficiency is of paramount importance. There should not be any degradation of oil or paper under the usual service conditions of a transformer. Even though paper and oil degradation is an extremely complex process, it is always possible to detect in transformer oil the characteristic gases which indicate the degradation resulting in failures. Dissolved gas analysis (DGA) of transformer oil is used for detecting such fault gases and interpreting the amounts to reach the root cause of the fault.

Vacuum degassing, approved as the most precise method in this sector, is used to extract gases from the sample taken from the transformer prior to gas chromatography with a precision of 0.01 ppm to determine the type of fault gases. Identifiable gases are hydrogen (H2), oxygen (O2), nitrogen (N2), methane (CH4), acetylene (C2H2), ethylene (C2H4), ethane (C2H6), carbon monoxide (CO), and carbon dioxide (CO2). Additionally, propene (C3H6) and propane (C3H8) are evaluated for precise interpretation of faults.

Insulation Oil Colour Measurement

The colour of transformer oil is a sign of oil aging and purity. As the oil degrades, the colour begins to change from light yellow to dark brown. This is a rapid indicator of the time of oil treatment or replacement of oil. 

Instruction for Oil Sampling from Transformer

Please follow the sampling instruction on the following link for oil tests requested to be performed in our Insulation Laboratories.