1. This test method covers extraction and measurement of gases dissolved in electrical insulating oil and identification and determination of the individual component gases extracted.
  2. Oil and oil-immersed electrical insulation materials may decompose under the influence of thermal and electrical stresses, and in doing so, generate gaseous decomposition products of varying composition which dissolve into the oil. The rate of gas generation and changes in concentration of specific gases over time are used to evaluate the condition of the electric apparatus.