1.1 本现场实践包括使用便携式仪器检测和估计变压器中油上方气层或气体检测器继电器中的可燃气体。它仅适用于使用矿物油作为介电流体的变压器。不确定油中溶解的气体和不可燃气体。包括使用已知气体混合物校准仪器的方法。 1.2 本规程提供了气体混合物中总可燃气体的半定量估计。如果需要更准确地测定可燃气体总量或定量测定单个成分，请使用实验室分析方法，如试验方法 D3612 . 1.3 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。 第节给出了具体的预防说明 7. . 1.4 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====== 4.1 变压器绝缘系统中的电弧、局部放电和局部过热会导致绝缘油和其他绝缘材料的化学分解。这可能会产生各种气体，其中一些是可燃气体。 通常，气体在油中生成，然后根据其各自的溶解度划分到气体空间。在早期故障发展到非常严重的情况或变压器故障之前，高度油溶性的气体（如乙炔）在气体空间中的含量可能不会很大。一氧化碳和氢气等气体在油中的溶解度较低，可构成气体空间中大部分可燃气体。检测这些气体通常是故障的第一个可用指示。便携式可燃气体流量计是检测产生气体的便捷方法。 4.2 变压器的正常运行可能会导致一些可燃气体的形成。通过这种方法检测早期故障涉及评估存在的可燃气体量、这些气体的生成速率及其从变压器中逃逸的速率。 请参阅IEEE C57.104，了解有关变压器中气体的解释的详细信息。

1.1 This field practice covers the detection and estimation of combustible gases in the gas blanket above the oil or in gas detector relays in transformers using portable instruments. It is applicable only with transformers using mineral oil as the dielectric fluid. Gases dissolved in the oil and noncombustible gases are not determined. A method of calibrating the instruments with a known gas mixture is included. 1.2 This practice affords a semi-quantitative estimate of the total combustible gases present in a gas mixture. If a more accurate determination of the total amount of combustible gases or a quantitative determination of the individual components is desired, use a laboratory analytical method, such as Test Method D3612 . 1.3 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. Specific precautionary statements are given in Section 7 . 1.4 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 ====== 4.1 Arcing, partial discharge, and localized overheating in the insulation system of transformers result in chemical decomposition of the insulating oil and other insulating materials. This may generate various gases, some of which are combustible. Typically, gases are generated in the oil and then partitioned into the gas space according to their individual solubilities. Gases which are highly oil-soluble, such as acetylene, may not be in significant quantities in the gas space until an incipient fault has progressed to a very serious condition or failure of the transformer. Gases such as carbon monoxide and hydrogen which have low solubilities in oil can make up a large fraction of the combustible gases in the gas space. Detection of these gases is frequently the first available indication of a malfunction. Portable combustible gas meters are a convenient means of detecting the presence of generated gases. 4.2 Normal operation of a transformer may result in the formation of some combustible gases. The detection of an incipient fault by this method involves an evaluation of the amount of combustible gases present, the rate of generation of these gases, and their rate of escape from the transformer. Refer to IEEE C57.104 for detailed information on interpretation of gassing in transformers.