1.1 本试验方法具体描述了在不受其他电气设备材料或电应力影响的情况下，确定因绝缘液体在120°C下的热应力而产生的气体特性的程序。本试验方法主要用于绝缘矿物油。它可以应用于油中溶解气体分析的其他绝缘液体（试验方法 D3612 )通常执行。 1.2 该测试方法特别适用于检测有时称为“杂散气体”的现象，在CIGRE TF11 B39中也有提及。 1.3 本试验方法在变压器绝缘液体上进行，以确定油在低温下产生某些气体（如氢和碳氢化合物）的倾向性。 1.4 本试验方法详述了两个程序: 1.5 方法A描述了在120°C下164小时测定绝缘液体气体特性的程序。 1.6 方法B描述了通过凹凸棒土粘土柱处理绝缘液的程序，以去除有机污染物和其他可能影响绝缘液放气行为的活性基团，怀疑绝缘液受到污染。 本程序适用于新的和使用过的绝缘液。 1.7 以国际单位制表示的数值应视为标准值。如果没有公制等效单位，则使用英制单位。 1.8 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.9 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。 ====意义和用途====== 5.1 可燃气体的产生用于确定充油电气设备的状况。多年的经验证据已经产生了一些准则，如IEEE C57.104、IEC 60599和IEC 61464中给出的准则。行业经验表明，充油电气设备中的电气和热故障是产生气体的常见来源。经验表明，由于热应力或污染，油中可能会形成一些气体，而没有任何其他影响。 5.2 一些承受热应力的变压器油和含有某些类型污染的油可能会在低于正常预期的温度下产生特定气体，因此错误地指示电气设备的异常操作。一些新油在不受其他电气设备材料或电应力影响的情况下产生了大量气体，尤其是氢。这使得溶解气体分析的解释更加复杂。 5.3 已发现加热164小时足以达到稳定且具有特征的放气模式。 5.4 该方法使用干燥空气和干燥氮气作为喷射气体。这是为了反映允许氧气接触油的电气设备保存系统或与外部大气密封的电气设备保存系统。与喷射氮气的油相比，喷射空气的油通常会产生更多的氢（占总可燃气体含量的百分比），因为这些油相对于氢产生更多的碳氢化合物。

1.1 This test method describes the procedures to determine the gassing characteristics due to thermal stress at 120°C of insulating liquids specifically and without the influence of other electrical apparatus materials or electrical stresses. This test method was primarily designed for insulating mineral oil. It can be applied to other insulating liquids in which dissolved gas-in-oil analysis (Test Method D3612 ) is commonly performed. 1.2 This test method is particularly suited for detection of the phenomenon sometimes known as “stray gassing” and is also referred to in CIGRE TF11 B39. 1.3 This test method is performed on transformer insulating liquids to determine the propensity of the oil to produce certain gases such as hydrogen and hydrocarbons at low temperatures. 1.4 This test method details two procedures: 1.5 Method A describes the procedure for determining the gassing characteristics of insulating liquids, at 120°C for 164 h. 1.6 Method B describes the procedure for processing the insulating liquid through an attapulgite clay column to remove organic contaminants and other reactive groups that may influence the gassing behavior of an insulating liquid, which is suspected of being contaminated. This procedure applies to both new and used insulating liquids. 1.7 The values stated in SI units are to be regarded as standard. English units are used when there is no metric equivalent. 1.8 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.9 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 5.1 Generation of combustible gases is used to determine the condition of oil-filled electrical apparatus. Many years of empirical evidence has yielded guidelines such as those given in IEEE C57.104, IEC 60599 and IEC 61464. Industry experience has shown that electric and thermal faults in oil-filled electrical apparatus are the usual sources that generate gases. Experience has shown that some of the gases could form in the oil due to thermal stress or as a result of contamination, without any other influences. 5.2 Some transformer oils subjected to thermal stress and oils that contain certain types of contamination may produce specific gases at lower temperatures than normally expected for their generation and hence, falsely indicate abnormal operation of the electrical apparatus. Some new oils have produced large amounts of gases, especially hydrogen, without the influence of other electrical apparatus materials or electrical stresses. This renders interpretation of the dissolved gas analysis more complicated. 5.3 Heating for 164 h has been found to be sufficient to reach a stable and characteristic gassing pattern. 5.4 This method uses both dry air and dry nitrogen as the sparging gas. This is to reflect either an electrical apparatus preservation system that allows oxygen to contact the oil or one that is sealed from the outside atmosphere. Oils sparged with air generally produce much more hydrogen as a percentage of the total combustible gas content as compared to oils sparged with nitrogen as these produce more hydrocarbons in relation to hydrogen.