1.1 本试验方法包括在电绝缘液体中测定纤维素材料降解产物，如纸、纸板和棉花材料，通常用作电气设备中的绝缘材料。这些降解产物是取代的呋喃衍生物，通常称为呋喃化合物或呋喃。该测试方法允许从样品基质中液相/液相或固相萃取（SPE）呋喃化合物，然后通过HPLC分析特定呋喃化合物，或直接注射通过HPLC分析具体呋喃化合物。 1.2 可以鉴定和量化的个别呋喃化合物包括以下内容: 5-羟甲基-2-糠醛 糠醇 2-糠醛 2-乙酰基呋喃 5-甲基-2-糠醛 1.3 直接注射法通常具有较高的检测极限，尤其是对糠醇。与提取方法相比，当使用直接注射方法时，可能预期对糠醇有更大的干扰。 1.4 该测试方法已成功用于测试矿物绝缘油、硅油、矿物来源的高燃点电绝缘油、阿斯卡瑞尔和全氯乙烯基电介质流体中的呋喃化合物。 1.5 以国际单位制表示的数值应视为标准。本标准不包括其他计量单位。 1.6 本标准并不旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者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。 1.7 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。 ====意义和用途====== 5.1 呋喃化合物是由电气设备固体绝缘系统中使用的纤维素材料降解而产生的。 5.2 在相当程度上可溶于油的呋喃化合物将迁移到绝缘液体中。 5.3 油中呋喃化合物浓度的高浓度或异常增加可能表明纤维素因老化或早期故障条件而降解。呋喃化合物的测试可用于补充根据测试方法进行的油中溶解气体分析 D3612 .

1.1 This test method covers the determination in electrical insulating liquids of products of the degradation of cellulosic materials such as paper, pressboard, and cotton materials typically found as insulating materials in electrical equipment. These degradation products are substituted furan derivatives, commonly referred to as furanic compounds or furans. This test method allows either liquid/liquid or solid phase extraction (SPE) of the furanic compounds from the sample matrix followed by analysis for specific furanic compounds by HPLC or direct injection for analysis of specific furanic compounds by HPLC. 1.2 The individual furanic compounds that may be identified and quantified include the following: 5-hydroxymethyl-2-furaldehyde furfuryl alcohol 2-furaldehyde 2-acetylfuran 5-methyl-2-furaldehyde 1.3 The direct injection method generally has a higher limit of detection, especially for furfuryl alcohol. Greater interference for furfuryl alcohol may be expected when using the direct injection method as opposed to extraction methods. 1.4 This test method has been used to successfully test for furanic compounds in mineral insulating oil, silicone fluid, high fire point electrical insulating oils of mineral origin, askarels, and perchloroethylene-based dielectric fluids. 1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.6 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. 1.7 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 Furanic compounds are generated by the degradation of cellulosic materials used in the solid insulation systems of electrical equipment. 5.2 Furanic compounds which are oil soluble to an appreciable degree will migrate into the insulating liquid. 5.3 High concentrations or unusual increases in the concentrations of furanic compounds in oil may indicate cellulose degradation from aging or incipient fault conditions. Testing for furanic compounds may be used to complement dissolved gas in oil analysis as performed in accordance with Test Method D3612 .