1.1 本试验方法涵盖矿物绝缘油中颗粒浓度和粒度分布的测定。它适用于测试粘度为6至20 mm的油 2. /该测试方法适用于使用消光原理的液体自动颗粒分析仪。 1.2 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。 1.3 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和健康实践，并确定监管限制的适用性。 ====意义和用途====== 5.1 绝缘油中的颗粒会对流体的介电性能产生不利影响，具体取决于颗粒的大小、浓度和性质。 这些颗粒的来源可能是外部污染物、油降解副产品或内部材料，如金属、碳或纤维素纤维。 5.2 颗粒计数提供了一般程度的污染水平，可能有助于评估特定类型电气设备的状况。颗粒计数也可用于确定处理机油时的过滤效果。 5.3 如果需要更具体的颗粒性质知识，则必须进行其他测试，如金属分析或纤维识别和计数。

1.1 This test method covers the determination of particle concentration and particle size distribution in mineral insulating oil. It is suitable for testing oils having a viscosity of 6 to 20 mm 2 /s at 40°C. The test method is specific to liquid automatic particle analyzers that use the light extinction principle. 1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.3 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 and health practices and determine the applicability of regulatory limitations prior to use. ====== Significance And Use ====== 5.1 Particles in insulating oil can have a detrimental effect on the dielectric properties of the fluid, depending on the size, concentration, and nature of the particles. The source of these particles can be external contaminants, oil degradation by-products, or internal materials such as metals, carbon, or cellulose fibers. 5.2 Particle counts provide a general degree of contamination level and may be useful in assessing the condition of specific types of electrical equipment. Particle counts can also be used to determine filtering effectiveness when processing oil. 5.3 If more specific knowledge of the nature of the particles is needed, other tests such as metals analysis or fiber identification and counting must be performed.