Dissolved Gas Analysis

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The Dissolved Gas Analysis ( English , DGA, German analysis of dissolved gases ) is a method that is used to assess the condition of power transformers . This makes use of the fact that gases are split off from the hydrocarbon chains of the transformer oil when energy is supplied and are dissolved in the oil. From the proportions (cf. Duval triangle - IEC 60599) of different gases to one another, an assessment can be made as to which added energy caused it to develop . However, this requires certain minimum concentrations of the gases. This allows a distinction to be made between thermal (as a result of local temperature increases) and electrical errors (such as discharges in the active part). The IEC standard 60599 requires such a distinction for a measurement method.

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