1.1 本试验方法包括通过库仑卡尔费休滴定法测量绝缘液体中的水。本试验方法通常用于100以下的试样 % 油中水的相对饱和度。库仑测试方法以其高灵敏度（通常为10μg H）而闻名 2. O） 。本试验方法要求使用专门为库仑滴定设计的设备。 1.2 本试验方法建议使用市售库仑卡尔费休滴定仪和试剂。 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。 有关具体预防说明，请参阅 8.1 和 A2.1 . 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====== 4.1 过多的水含量可能会对绝缘液体的电气特性产生有害影响。由于介电击穿电压等特性的劣化，高含水量可能使介电液体不适合某些电气应用。 4.2 本试验适用于验收规范、加工控制和评估工作中介质液体的状况。

1.1 This test method covers the measurement of water present in insulating liquids by coulometric Karl Fischer titration. This test method is used commonly for test specimens below 100 % relative saturation of water in oil. The coulometric test method is known for its high degree of sensitivity (typically 10 μg H 2 O). This test method requires the use of equipment specifically designed for coulometric titration. 1.2 This test method recommends the use of commercially available coulometric Karl Fischer titrators and reagents. 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. For specific precautionary statements see 8.1 and A2.1 . 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 ====== 4.1 Electrical characteristics of an insulating liquid may be affected deleteriously by excessive water content. A high water content may make a dielectric liquid unsuitable for some electrical applications due to deterioration of properties such as the dielectric breakdown voltage. 4.2 This test is suitable for use in acceptance specifications, in control of processing, and in evaluating the condition of dielectric liquids in service.