1.1 本试验方法描述了在浸入绝缘液的电气绝缘系统中发现的纤维素材料降解副产物的测定。这些材料包括纸、纸板、木材和棉花材料。本试验方法允许通过顶空GC-MS或GC-FID分析样品基质中的甲醇和乙醇。 1.2 本试验方法用于测试矿物绝缘液和中定义的矿物来源的易燃性较低的电绝缘液中的甲醇和乙醇 D3487 和 D5222 分别地目前，这种方法还没有在酯液体中得到实际应用。 1.3 以国际单位制表示的数值应视为标准值。本标准不包括其他计量单位。 1.4 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。 1.5 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 甲醇和乙醇是通过降解用于电气设备固体绝缘系统的纤维素材料而产生的。更具体地说，甲醇来自纤维素材料的解聚。 3. , 4. , 5. , 6. 5.2 甲醇和乙醇在相当程度上可溶于绝缘液体，从纤维素中生产出来后，它们将按比例迁移到该液体中。 5.3 绝缘液体中甲醇或乙醇或两者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。 这些醇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和呋喃化合物 D3612 和 D5837 分别地

1.1 This test method describes the determination of by-products of cellulosic materials degradation found in electrical insulation systems that are immersed in insulating liquid. Such materials include paper, pressboard, wood and cotton materials. This test method allows the analysis of methanol and ethanol from the sample matrix by headspace GC-MS or GC-FID. 1.2 This test method has been used to test for methanol and ethanol in mineral insulating liquids and less flammable electrical insulating liquids of mineral origin as defined in D3487 and D5222 respectively. Currently, this method is not a practical application for ester liquids. 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 ====== 5.1 Methanol and ethanol are generated by the degradation of cellulosic materials used in the solid insulation systems of electrical equipment. More particularly, methanol comes from the depolymerization of cellulosic materials. 3 , 4 , 5 , 6 5.2 Methanol and ethanol, which are soluble in an insulating liquid to an appreciable degree, will proportionally migrate to that liquid after being produced from the cellulose. 5.3 High concentrations or unusual increases in the concentrations of methanol or ethanol, or both, in an insulating liquid may indicate cellulose degradation from aging or incipient fault conditions. Testing for these alcohols may be used to complement dissolved gas-in-oil analysis and furanic compounds as performed in accordance with Test Methods D3612 and D5837 respectively.