液体绝缘材料.相对电容率、电介质损耗因数(tan<δ>)和直流电阻率的测量

[中文适用范围]： 本标准规定了在试验温度卜液体绝缘材料的介质损耗因数、相对电容率和直流电阻率的测量方法。 本标准主要是对未使川过的液体做参考性试验，但也适用于在运行中的变压器、电缆和其他电工设 备中的液体。然而，本标准只适用于单相液体，当做例行测量时可以采用简化方法和附录C所述的 方法。 对于非碳氢化合物绝缘液体，则要求采用其他清洗方法。 [外文原描述]： Describes methods for the determination of the dielectric dissipation factor, relative permittivity and d.c. resistivity of any insulating liquid material at the test temperature. The methods are primarily intended for making reference tests on unused liquids. They can also be applied to liquids in service in transformers, cables and other electrical apparatus. However the method is applicable to a single phase liquid only. When it is desired to make routine determinations, simplified procedures, as described in Annex C, may be adopted. With insulating liquids other than hydrocarbons, alternative cleaning procedures may be required. The main changes from the previous edition deal with the preferred measurement method.