1.1 本规范包括变压器绝缘液体上方气体的取样。气体取样瓶从处于正压的气体空间收集气体样品。 1.2 采集代表性气体样品进行分析以确定其成分。 1.3 以SI单位表示的值将被视为标准值。本标准不包括其他计量单位。 1.4 本标准并不旨在解决与其使用相关的所有安全性问题（如果有）。本标准的使用者有责任在使用前建立适当的安全、健康和环境实践并确定法规限制的适用性。 1.5 本国际标准是根据世界贸易组织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的标准化原则制定的iers贸易（TBT）委员会。 ======意义和用途====== 2.1 来自变压器和其他电力设备中的绝缘液体上方的气体样品可用于给出正在发展的故障状况的早期指示。绝缘材料在热应力和电应力下分解形成可燃气体。可燃气体浓度过高表明需要采取适当的措施。 2.2 重要的是，设备中的气体样本应取自液位正上方的气体空间，而不是取自远程膨胀室，例如储罐支撑带。 2.3 应仔细遵循所述程序，以确保样品不被空气或氮气稀释，或被取样瓶中的残留物质污染。

1.1 This practice covers the sampling of gas above the insulating liquid of a transformer. A gas sampling bottle collects the gas sample from the gas space that is at a positive pressure. 1.2 Representative samples of gas are taken for analysis to determine their compositions. 1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.4 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. 1.5 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 ====== 2.1 A gas sample from above the insulating liquid in transformers and other electrical power apparatus can be used to give an early indication of developing fault conditions. Combustible gases are formed from the breakdown of the insulating materials under thermal and electrical stress. Excessive concentrations of combustible gases indicate the need to take appropriate action. 2.2 It is important that gas samples from equipment be taken from the gas space directly above the liquid level, and not from remote expansion compartments, such as tank bracing bands. 2.3 The procedure described should be carefully followed to ensure that the sample is not diluted by air or nitrogen, or contaminated by residual materials in the sampling bottle.