to ensure that new transformers are healthy thru benchmarking. The solution of the Dissolved Gas Analysis is anchored on the proven idea that transformers, during its service life, generates combustible and decomposition gasses. These gasses are essentially from various insulation, under different levels of thermal, electrical, or mechanical stress.
WESTCO’s insulating oil laboratory has been designed from the ground up with our core values of Mastery | Integrity | Care | Excellence as its very foundation. Gone are the days that you second-guess “PASS or FAIL” reports. The WESTCO difference is that we just don’t leave the numbers for you to decipher, we provide sound electrical interpretations based on chemical results, providing the end-user the what, why, and how.
The following oil tests are available from WESTCO’s Insulating Oil Laboratory:
|Test Method||ASTM Method||Test Significance||Units of Measurement|
|Dissolved Gas Analysis (DGA||D3612||Identification of gas parts per million (ppm), which indicates the amount of contaminant in the oil. Various gasses that dissolve in oil indicates the types of thermal and electrical stress occurring within the transformer||ppm|
|Moisture Content||D1533||Even in minute quantities, water or moisture is extremely dangerous for power equipment. Moisture accelerates the deterioration of insulating oil and paper insulation||ppm|
|Neutralization (Acid) Number||D664||Acid Number test is used to determine the total acid value of the transformer oil. As acid value increase, the insulating quality of the oil decreases.||mg
|Interfacial Tension||D971||The IFT or Interfacial Tension measures the tension between water and oil at the point of interface. The IFT test is determines the presence of oil decay products and soluble contaminants from solid insulating materials||dynes/cm|
|Dielectric Breakdown Voltage (DBV)||D1816||The DBV test determines the strength of an insulating oil sample to withstand electrical voltage without failure. Contaminants such as moisture, or particulates can compromise the insulation properties of oil.||kV|
|Power Factor / Dissipation Factor||D924||The Oil Power Factor Test measures the leakage current through an insulating oil. This test also determines dielectric losses of the oil, or the energy that is dissipated as heat||%|
|Color||D1500||Transformer oil color is determined by means of transmitted light. This is given a numerical value (0-5) based on comparison with a series of color standards or color wheel.||0-5|
|Visual Examination||D1524||The transformer insulating oil is visually examined by passing a beam of light to determine transparency and identify foreign contaminants. Contaminated Oil shows poor transparency, clouding, or the visual evidence of foreign particles.||Bright, Dar, Clear of Particles|