Insulation Fluids Tests

Inspection of insulation liquids plays an important role at diagnosing internal condition of oil impregnated components as well as providing data about transformers in service.

We are confident that our policy to pursue future technologies will continue to grant us advanced diagnosis techniques and capability to expertly interpretation of insulation liquids tests.

 

Following tests are performed in ENPAY Laboratories in complience with related standard by using special devices and necessary chemicals.

  • Breakdown Voltage 
  • Water Content
  • Dielectric Dissipation Factor (DDF) / Tan d
  • Resistivity (+/-)
  • Interfacial Tension (IFT)
  • Acidity

 

Fault Indicators in Power Transformers

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 usual service conditions of transformer. Despite the fact that the 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 in order 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 in order 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

Colour of transformer oil is a sign of oil aging and purity. As the oil degrades, colour begins to change from light yellow to dark brown. This is a rapid indicator for the time of oil treatment or replacing of oil. Without colour measurement of transformer oil, there will not be a clear and quick indication for status of oil, which may lead to unexpected problems in transformer.