HD 397 S1:1979

HD 397 S1:1979 is a standardization document published by CLC. Its full title is "Interpretation of the analysis of gases in transformers and other oil-filled electrical equipment in service". This standard covers: Electrical discharges or thermal stresses in the oil or solid insulation, for example paper pressboard etc, of an oil-filled transformer cause degradation of these materials with the formation of gases of various types - To some extent these gases dissolve in the oil but using techniques described in IEC Publication 567, Guide for the Sampling of Gases and of Oil from Oil-filled Electrical Equipment and for the Analysis of Free and Dissolved Gases, they may be removed from a sample of the oil and analyzed quantitatively by gas chromatography - This standard describes how the concentrations of dissolved gases or of free gases may be interpreted to diagnose the condition of a transformer in service and suggest future action - The methods of interpretation have been developed for power transformers wound with copper conductors insulated with cellulosic paper or pressboard-base solid insulation and filled with hydrocarbon mineral oil in service on power networks; until further experience has been gained, the methods should be applied with caution in relation to other materials - The methods may also apply in principle to instrument transformers oil-filled cables, switchgear, etc. but insufficient experience is available to formulate suitable interpretation and limits. In any case, the indication obtained must be viewed only as a guide, any resulting action must be undertaken with proper engineering judgement

Electrical discharges or thermal stresses in the oil or solid insulation, for example paper pressboard etc, of an oil-filled transformer cause degradation of these materials with the formation of gases of various types - To some extent these gases dissolve in the oil but using techniques described in IEC Publication 567, Guide for the Sampling of Gases and of Oil from Oil-filled Electrical Equipment and for the Analysis of Free and Dissolved Gases, they may be removed from a sample of the oil and analyzed quantitatively by gas chromatography - This standard describes how the concentrations of dissolved gases or of free gases may be interpreted to diagnose the condition of a transformer in service and suggest future action - The methods of interpretation have been developed for power transformers wound with copper conductors insulated with cellulosic paper or pressboard-base solid insulation and filled with hydrocarbon mineral oil in service on power networks; until further experience has been gained, the methods should be applied with caution in relation to other materials - The methods may also apply in principle to instrument transformers oil-filled cables, switchgear, etc. but insufficient experience is available to formulate suitable interpretation and limits. In any case, the indication obtained must be viewed only as a guide, any resulting action must be undertaken with proper engineering judgement

HD 397 S1:1979 has the following relationships with other standards: It is inter standard links to EN 60599:1999, EN 60044-1:1999, EN 60567:1992, EN 61203:1994. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.

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