1.1 本试验方法包括测定绝缘液体（石油来源的油、硅酮液体、高燃点矿物电绝缘油、合成酯液体和天然酯液体）的介电击穿电压。本试验方法适用于电缆、变压器、油断路器和类似设备中常用的作为绝缘和冷却介质的绝缘液体。参考术语 D2864 本试验方法中使用的定义。 1.2 本试验方法对溶液中水分的有害影响敏感，尤其是当液体中存在纤维素纤维时。它在绝缘系统中绝缘液体介电击穿强度的诊断和实验室研究中特别有用。 2. 1.3 本试验方法用于判断绝缘液体是否满足VDE电极击穿电压要求。该测试方法应按照专业组织标准（如IEEE C57）的建议使用。 106 1.4 本试验方法可用于获得试验方法中规定的硅流体的介电击穿 D2225 规格 D4652 ，或规格 D6871 ，前提是在连续五次击穿中，每次击穿的样品放电能量小于20 mJ（毫焦耳）。 1.5 公制和替代英寸-磅单位均可接受。 1.6 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。 1.7 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====== 3.1 绝缘液体的介电击穿电压是衡量液体在不发生故障的情况下承受电应力的能力的重要指标。介电击穿电压用于指示液体中存在污染物，例如水、污垢、纤维素纤维或导电颗粒，当获得低击穿电压时，其中一种或多种可能以显著浓度存在。然而，高介电击穿电压并不一定表示没有所有污染物； 这可能仅仅表明，当使用本试验方法进行试验时，电极之间液体中存在的污染物浓度不足以对液体的平均击穿电压产生有害影响（见 附录X1 .) 3.2 本试验方法用于实验室或现场试验。为了使现场分解结果与实验室结果具有可比性，必须满足所有标准，包括室温（20至30°C）。

1.1 This test method covers the determination of the dielectric breakdown voltage of insulating liquids (oils of petroleum origin, silicone fluids, high fire-point mineral electrical insulating oils, synthetic ester fluids and natural ester fluids). This test method is applicable to insulating liquids commonly used in cables, transformers, oil circuit breakers, and similar apparatus as an insulating and cooling medium. Refer to Terminology D2864 for definitions used in this test method. 1.2 This test method is sensitive to the deleterious effects of moisture in solution especially when cellulosic fibers are present in the liquid. It has been found to be especially useful in diagnostic and laboratory investigations of the dielectric breakdown strength of insulating liquid in insulating systems. 2 1.3 This test method is used to judge if the VDE electrode breakdown voltage requirements are met for insulating liquids. This test method should be used as recommended by professional organization standards such as IEEE C57.106. 1.4 This test method may be used to obtain the dielectric breakdown of silicone fluid as specified in Test Method D2225 , Specification D4652 , or Specification D6871 , provided that the discharge energy into the sample is less than 20 mJ (milli joule) per breakdown for five consecutive breakdowns. 1.5 Both the metric and the alternative inch-pound units are acceptable. 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 ====== 3.1 The dielectric breakdown voltage of an insulating liquid is of importance as a measure of the liquid's ability to withstand electric stress without failure. The dielectric breakdown voltage serves to indicate the presence of contaminating agents such as water, dirt, cellulosic fibers, or conducting particles in the liquid, one or more of which may be present in significant concentrations when low breakdown voltages are obtained. However, a high dielectric breakdown voltage does not necessarily indicate the absence of all contaminants; it may merely indicate that the concentrations of contaminants that are present in the liquid between the electrodes are not large enough to deleteriously affect the average breakdown voltage of the liquid when tested by this test method (see Appendix X1 .) 3.2 This test method is used in laboratory or field tests. For field breakdown results to be comparable to laboratory results, all criteria including room temperature (20 to 30 °C) must be met.