1.1 该实践可用于通过与基本物理性质的相关性来确定矿物绝缘油的碳类型成分。对于常规分析目的，它消除了复杂的分级分离和纯化程序的必要性。该实践适用于具有200至600以上的平均分子量和0至50个芳族碳原子的油。 1.2 碳类型组成表示为芳香碳的百分比、环烷碳的百分比和链烷烃碳的百分比。这些值可以从相关图中获得， 图1 ，如果粘度-重力常数（VGC）和折射率截距( r 我 )的油是已知的。粘度、密度和相对密度（比重）以及折射率是使用该测试方法所需的唯一实验数据。 图1 用于确定的相关图 % C A. , % C N 和 % C P 1.3 这种做法有助于确定电力变压器和传输电缆中常用类型的电绝缘油的碳类成分。它主要用于抑制或不抑制的新油。 1.4 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。 1.5 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。 1.6 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 这种做法的主要目的是表征油的碳类成分。它也适用于观察加氢处理、溶剂萃取等各种精炼工艺对油组分的影响。 它在将油的化学性质与已被证明与油成分有关的其他现象联系起来方面具有次要应用。 5.2 本规程获得的结果与试验方法获得的结果相似，但不完全相同 D3238 .两者之间的关系以及推导中使用的方程 图1 在文献中进行了讨论。 4. 5.3 尽管这种做法往往会给出一致的结果，但它可能无法与直接测量测试方法（如测试方法）相比 2007年2月 .

1.1 This practice may be used to determine the carbon-type composition of mineral insulating oils by correlation with basic physical properties. For routine analytical purposes it eliminates the necessity for complex fractional separation and purification procedures. The practice is applicable to oils having average molecular weights from 200 to above 600, and 0 to 50 aromatic carbon atoms. 1.2 Carbon-type composition is expressed as percentage of aromatic carbons, percentage of naphthenic carbons, and percentage of paraffinic carbons. These values can be obtained from the correlation chart, Fig. 1 , if both the viscosity-gravity constant (VGC) and refractivity intercept ( r i ) of the oil are known. Viscosity, density and relative density (specific gravity), and refractive index are the only experimental data required for use of this test method. FIG. 1 Correlation Chart for Determining % C A , % C N , and % C P 1.3 This practice is useful for determining the carbon-type composition of electrical insulating oils of the types commonly used in electric power transformers and transmission cables. It is primarily intended for use with new oils, either inhibited or uninhibited. 1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.5 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. 1.6 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 The primary purpose of this practice is to characterize the carbon-type composition of an oil. It is also applicable in observing the effect on oil constitution, of various refining processes such as hydrotreating, solvent extraction, and so forth. It has secondary application in relating the chemical nature of an oil to other phenomena that have been demonstrated to be related to oil composition. 5.2 Results obtained by this practice are similar to, but not identical with, results obtained from Test Method D3238 . The relationship between the two and the equations used in deriving Fig. 1 are discussed in the literature. 4 5.3 Although this practice tends to give consistent results, it may not compare with direct measurement test methods such as Test Method D2007 .