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Download the report (iis12L06) of this Proficiency Test on DGA in Transformer Oil

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Summary of this proficiency test:

On 7 Februari 2013, the proficiency test on DGA in Transformer Oil (iis12L06) was finished. It started on 24 October 2012 (see message "Proficiency Test on Transformer Oil, started" on this website) when the samples were distributed. In this international interlaboratory study 33 participants in 22 different countries have participated.

The samples were tested on Free and dissolved gases, Hydrogen H2, Oxygen O2, Nitrogen N2, Carbon monoxide CO, Carbon dioxide CO2, Methane CH4, Ethane C2H6, Ethene C2H4 (ethylene), Ethyn C2H2 (acetylene), Propane C3H8 and Propene C3H6.

The proficiency test report summarises per test, the test results, the analytical methods reported by the participants and the z-scores calculated for each participant are tabulated. Also, for each test, the calculated summary (e.g. mean, standard deviation and reproducibility) is given.

In the report also an evaluation of the test results is given. Problems encountered in the analyses are mentioned and - where possible - suggestions for quality improvement are formulated. For each test a comparison is made between the results of the group of participants and the requirements given by the relevant standard (e.g. ISO, DIN, ASTM).