Summary: State of the art for the diagnosis of undesired changes in the Insulating Systems of oil-immersed transformers is DGA - Dissolved Gas in oil Analysis [L1]. By the detecting variations of the individual gases over longer periods, it is possible to estimate the type, the size and in certain cases the localisation of the damage. The introduction of new vacuum treatment methods for transformers has raised worries weather results of DGA would not be deteriorated or changed in an unwanted manner

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