Transformers Magazine, Vol. 5 No. 2, 2018.
Original scientific paper
Transformer oil fault gases under thermal stress at 160 °C – Part I
Bernd Christian
Armin Glaeser
Abstract
Dissolved gas analysis is a common technique in the supervision and maintenance of transformers. It can give hints on defects and faults in oil-immersed transformers by determining and quantifying the gases arising due to the thermal or electrical stress. Different algorithms for the assessment of transformers, which utilize data obtained from dissolved gas analysis, have been published so far. However, only few investigations exist that deal with the influence of the oil´s composition on the oil´s tendency of releasing gases. This research study presents a comparison of three commercially available transformer oils of different composition regarding that aspect. The results indicate that the oil mainly consisting of paraffinic hydrocarbons shows a different gassing pattern compared to naphthenic oils when it is exposed to thermal stress. Some explanations for this phenomenon are given in the report as well.
Keywords
dissolved gas analysis; thermal stress; transformer oil; fault gases
Hrčak ID:
202539
URI
Publication date:
9.4.2018.
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